diff --git a/Cargo.lock b/Cargo.lock
index 66255b5..6d23027 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -11,6 +11,16 @@ dependencies = [
  "uuid",
 ]
 
+[[package]]
+name = "accesskit_consumer"
+version = "0.35.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "53cf47daed85312e763fbf85ceca136e0d7abc68e0a7e12abe11f48172bc3b10"
+dependencies = [
+ "accesskit",
+ "hashbrown 0.16.1",
+]
+
 [[package]]
 name = "adler2"
 version = "2.0.1"
@@ -29,6 +39,66 @@ dependencies = [
  "zerocopy",
 ]
 
+[[package]]
+name = "allocator-api2"
+version = "0.2.21"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "683d7910e743518b0e34f1186f92494becacb047c7b6bf616c96772180fef923"
+
+[[package]]
+name = "android-activity"
+version = "0.6.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0f2a1bb052857d5dd49572219344a7332b31b76405648eabac5bc68978251bcd"
+dependencies = [
+ "android-properties",
+ "bitflags 2.13.2",
+ "cc",
+ "jni",
+ "libc",
+ "log",
+ "ndk",
+ "ndk-context",
+ "ndk-sys",
+ "num_enum",
+ "thiserror 2.0.21",
+]
+
+[[package]]
+name = "android-properties"
+version = "0.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fc7eb209b1518d6bb87b283c20095f5228ecda460da70b44f0802523dea6da04"
+
+[[package]]
+name = "android_system_properties"
+version = "0.1.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ae221649c9976a6f6c56ae1facf410f3ddb33cc661c4b7b61020a912d4237fbc"
+dependencies = [
+ "libc",
+]
+
+[[package]]
+name = "arboard"
+version = "3.6.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0348a1c054491f4bfe6ab86a7b6ab1e44e45d899005de92f58b3df180b36ddaf"
+dependencies = [
+ "clipboard-win",
+ "image",
+ "log",
+ "objc2 0.6.5",
+ "objc2-app-kit 0.3.2",
+ "objc2-core-foundation",
+ "objc2-core-graphics",
+ "objc2-foundation 0.3.2",
+ "parking_lot",
+ "percent-encoding",
+ "windows-sys 0.60.2",
+ "x11rb",
+]
+
 [[package]]
 name = "arrayref"
 version = "0.3.9"
@@ -41,6 +111,21 @@ version = "0.7.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d3fb67a6e08acf24fdeccbac2cb6ac4305825bd1f117462e0e6f2f193345ad56"
 
+[[package]]
+name = "ash"
+version = "0.38.0+1.3.281"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0bb44936d800fea8f016d7f2311c6a4f97aebd5dc86f09906139ec848cf3a46f"
+dependencies = [
+ "libloading",
+]
+
+[[package]]
+name = "atomic-waker"
+version = "1.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1505bd5d3d116872e7271a6d4e16d81d0c8570876c8de68093a09ac269d8aac0"
+
 [[package]]
 name = "autocfg"
 version = "1.5.1"
@@ -53,6 +138,21 @@ version = "0.22.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "72b3254f16251a8381aa12e40e3c4d2f0199f8c6508fbecb9d91f575e0fbb8c6"
 
+[[package]]
+name = "bit-set"
+version = "0.10.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "09ec2f926cc3060f09db9ebc5b52823d85268d24bb917e472c0c4bea35780a7d"
+dependencies = [
+ "bit-vec",
+]
+
+[[package]]
+name = "bit-vec"
+version = "0.9.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b71798fca2c1fe1086445a7258a4bc81e6e49dcd24c8d0dd9a1e57395b603f51"
+
 [[package]]
 name = "bitflags"
 version = "1.3.2"
@@ -65,6 +165,24 @@ version = "2.13.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "3ded4057c258ba199e2d26386d3af3780957ecaee6c4ef4041c6b4b8b97c0b06"
 
+[[package]]
+name = "block2"
+version = "0.5.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2c132eebf10f5cad5289222520a4a058514204aed6d791f1cf4fe8088b82d15f"
+dependencies = [
+ "objc2 0.5.3",
+]
+
+[[package]]
+name = "block2"
+version = "0.6.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cdeb9d870516001442e364c5220d3574d2da8dc765554b4a617230d33fa58ef5"
+dependencies = [
+ "objc2 0.6.5",
+]
+
 [[package]]
 name = "bumpalo"
 version = "3.20.3"
@@ -91,12 +209,100 @@ dependencies = [
  "syn 3.0.6",
 ]
 
+[[package]]
+name = "byteorder-lite"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8f1fe948ff07f4bd06c30984e69f5b4899c516a3ef74f34df92a2df2ab535495"
+
+[[package]]
+name = "bytes"
+version = "1.12.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fc652a48c352aef3ea3aed32080501cf3ef6ed5da78602a020c991775b0aff04"
+
+[[package]]
+name = "calloop"
+version = "0.13.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b99da2f8558ca23c71f4fd15dc57c906239752dd27ff3c00a1d56b685b7cbfec"
+dependencies = [
+ "bitflags 2.13.2",
+ "log",
+ "polling",
+ "rustix 0.38.44",
+ "slab",
+ "thiserror 1.0.69",
+]
+
+[[package]]
+name = "calloop"
+version = "0.14.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "43b32313e937c8721c9d17ee9bf60699a6402b4b7c2cb6ac1bee0ffcaa4b4e5e"
+dependencies = [
+ "bitflags 2.13.2",
+ "polling",
+ "rustix 1.1.5",
+ "tracing",
+]
+
+[[package]]
+name = "calloop-wayland-source"
+version = "0.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "138efcf0940a02ebf0cc8d1eff41a1682a46b431630f4c52450d6265876021fa"
+dependencies = [
+ "calloop 0.14.5",
+ "rustix 1.1.5",
+ "wayland-backend",
+ "wayland-client",
+]
+
+[[package]]
+name = "cc"
+version = "1.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f74872d07caf508b30a21f6836e7d7016a2eaf7d9ff4f48deaa58cd8a0407630"
+dependencies = [
+ "find-msvc-tools",
+ "jobserver",
+ "libc",
+ "shlex",
+]
+
 [[package]]
 name = "cfg-if"
 version = "1.0.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "4e7648175b45a9a48536d676f68d918270699102aa8dab5496df06904c914600"
 
+[[package]]
+name = "cfg_aliases"
+version = "0.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f079e83a288787bcd14a6aea84cee5c87a67c5a3e660c30f557a3d24761b3527"
+
+[[package]]
+name = "clipboard-win"
+version = "5.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bde03770d3df201d4fb868f2c9c59e66a3e4e2bd06692a0fe701e7103c7e84d4"
+dependencies = [
+ "error-code",
+]
+
+[[package]]
+name = "codespan-reporting"
+version = "0.13.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "af491d569909a7e4dee0ad7db7f5341fef5c614d5b8ec8cf765732aba3cff681"
+dependencies = [
+ "serde",
+ "termcolor",
+ "unicode-width",
+]
+
 [[package]]
 name = "color"
 version = "0.3.3"
@@ -106,12 +312,73 @@ dependencies = [
  "bytemuck",
 ]
 
+[[package]]
+name = "combine"
+version = "4.6.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cfc320937d09e6de266b31b9afb480f197d7a861be86be7cb2ea7e5d1bfffc5e"
+dependencies = [
+ "bytes",
+ "memchr",
+]
+
+[[package]]
+name = "concurrent-queue"
+version = "2.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4ca0197aee26d1ae37445ee532fefce43251d24cc7c166799f4d46817f1d3973"
+dependencies = [
+ "crossbeam-utils",
+]
+
+[[package]]
+name = "core-foundation"
+version = "0.9.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "91e195e091a93c46f7102ec7818a2aa394e1e1771c3ab4825963fa03e45afb8f"
+dependencies = [
+ "core-foundation-sys",
+ "libc",
+]
+
+[[package]]
+name = "core-foundation-sys"
+version = "0.8.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "773648b94d0e5d620f64f280777445740e61fe701025087ec8b57f45c791888b"
+
+[[package]]
+name = "core-graphics"
+version = "0.23.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c07782be35f9e1140080c6b96f0d44b739e2278479f64e02fdab4e32dfd8b081"
+dependencies = [
+ "bitflags 1.3.2",
+ "core-foundation",
+ "core-graphics-types",
+ "foreign-types",
+ "libc",
+]
+
+[[package]]
+name = "core-graphics-types"
+version = "0.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "45390e6114f68f718cc7a830514a96f903cccd70d02a8f6d9f643ac4ba45afaf"
+dependencies = [
+ "bitflags 1.3.2",
+ "core-foundation",
+ "libc",
+]
+
 [[package]]
 name = "craft-ui"
 version = "0.1.0"
 dependencies = [
  "egui",
  "egui_extras",
+ "egui_kittest",
+ "image",
 ]
 
 [[package]]
@@ -123,21 +390,118 @@ dependencies = [
  "cfg-if",
 ]
 
+[[package]]
+name = "crossbeam-utils"
+version = "0.8.23"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a31eee39dddec8330830986fcd7625edb5a24ec90ea038215273bbc3adb08ac6"
+
+[[package]]
+name = "crunchy"
+version = "0.2.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "460fbee9c2c2f33933d720630a6a0bac33ba7053db5344fac858d4b8952d77d5"
+
+[[package]]
+name = "cursor-icon"
+version = "1.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f27ae1dd37df86211c42e150270f82743308803d90a6f6e6651cd730d5e1732f"
+
 [[package]]
 name = "data-url"
 version = "0.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "be1e0bca6c3637f992fc1cc7cbc52a78c1ef6db076dbf1059c4323d6a2048376"
 
+[[package]]
+name = "dispatch"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bd0c93bb4b0c6d9b77f4435b0ae98c24d17f1c45b2ff844c6151a07256ca923b"
+
+[[package]]
+name = "dispatch2"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1e0e367e4e7da84520dedcac1901e4da967309406d1e51017ae1abfb97adbd38"
+dependencies = [
+ "bitflags 2.13.2",
+ "objc2 0.6.5",
+]
+
+[[package]]
+name = "dlib"
+version = "0.5.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ab8ecd87370524b461f8557c119c405552c396ed91fc0a8eec68679eab26f94a"
+dependencies = [
+ "libloading",
+]
+
+[[package]]
+name = "document-features"
+version = "0.2.12"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d4b8a88685455ed29a21542a33abd9cb6510b6b129abadabdcef0f4c55bc8f61"
+dependencies = [
+ "litrs",
+]
+
+[[package]]
+name = "downcast-rs"
+version = "1.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "75b325c5dbd37f80359721ad39aca5a29fb04c89279657cffdda8736d0c0b9d2"
+
+[[package]]
+name = "dpi"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d8b14ccef22fc6f5a8f4d7d768562a182c04ce9a3b3157b91390b52ddfdf1a76"
+
 [[package]]
 name = "ecolor"
 version = "0.36.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0656a7530b9e2841ee7a5f983965bdd9840c32f4012f759cfd44b912cced6b34"
 dependencies = [
+ "bytemuck",
  "emath",
 ]
 
+[[package]]
+name = "eframe"
+version = "0.36.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "55ad41fac6e3149abb4866e93df37dbd33baa95db525c3368c944584e95a5dc2"
+dependencies = [
+ "ahash",
+ "bytemuck",
+ "document-features",
+ "egui",
+ "egui-wgpu",
+ "egui-winit",
+ "image",
+ "js-sys",
+ "log",
+ "objc2 0.6.5",
+ "objc2-app-kit 0.3.2",
+ "objc2-foundation 0.3.2",
+ "parking_lot",
+ "percent-encoding",
+ "pollster",
+ "profiling",
+ "raw-window-handle",
+ "static_assertions",
+ "wasm-bindgen",
+ "web-sys",
+ "web-time",
+ "wgpu",
+ "windows-sys 0.61.2",
+ "winit",
+]
+
 [[package]]
 name = "egui"
 version = "0.36.2"
@@ -158,6 +522,46 @@ dependencies = [
  "web-sys",
 ]
 
+[[package]]
+name = "egui-wgpu"
+version = "0.36.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5cef1f6d1bba40b09a4d0d62cb822b81030922cfbf65c5373398c3a3caafc5bd"
+dependencies = [
+ "ahash",
+ "bytemuck",
+ "document-features",
+ "egui",
+ "epaint",
+ "log",
+ "profiling",
+ "thiserror 2.0.21",
+ "type-map",
+ "web-time",
+ "wgpu",
+ "winit",
+]
+
+[[package]]
+name = "egui-winit"
+version = "0.36.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "98466000559d66ba4db786a30448b01483946add4188e7f10f522a27b4fb89cc"
+dependencies = [
+ "arboard",
+ "bytemuck",
+ "egui",
+ "log",
+ "objc2 0.6.5",
+ "objc2-foundation 0.3.2",
+ "objc2-ui-kit 0.3.2",
+ "profiling",
+ "raw-window-handle",
+ "smithay-clipboard",
+ "web-time",
+ "winit",
+]
+
 [[package]]
 name = "egui_extras"
 version = "0.36.2"
@@ -173,6 +577,24 @@ dependencies = [
  "resvg",
 ]
 
+[[package]]
+name = "egui_kittest"
+version = "0.36.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5eb3f3effb2726fee23449293e67acbf6cc6ce35525b1722bd5743bb348114d5"
+dependencies = [
+ "eframe",
+ "egui",
+ "egui-wgpu",
+ "image",
+ "kittest",
+ "log",
+ "pollster",
+ "serde",
+ "toml",
+ "wgpu",
+]
+
 [[package]]
 name = "either"
 version = "1.19.0"
@@ -184,6 +606,9 @@ name = "emath"
 version = "0.36.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "52c8d4141cf0f60fb2f7aefaf352d3ffa5171ef0ab09731c64391801e95e48f1"
+dependencies = [
+ "bytemuck",
+]
 
 [[package]]
 name = "enum-map"
@@ -212,6 +637,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a0ec0308dc23130fc1a7d4623a8534c2ed069c6dc84e258ee4f3de99615aa1a3"
 dependencies = [
  "ahash",
+ "bytemuck",
  "ecolor",
  "emath",
  "font-types",
@@ -228,6 +654,28 @@ dependencies = [
  "vello_cpu",
 ]
 
+[[package]]
+name = "equivalent"
+version = "1.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "877a4ace8713b0bcf2a4e7eec82529c029f1d0619886d18145fea96c3ffe5c0f"
+
+[[package]]
+name = "errno"
+version = "0.3.14"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "39cab71617ae0d63f51a36d69f866391735b51691dbda63cf6f96d042b63efeb"
+dependencies = [
+ "libc",
+ "windows-sys 0.61.2",
+]
+
+[[package]]
+name = "error-code"
+version = "3.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0b5343afd4a8365a643ac588dab4cf234a190c7f6c88c9f6dd6ffe00837661b7"
+
 [[package]]
 name = "euclid"
 version = "0.22.14"
@@ -237,6 +685,12 @@ dependencies = [
  "num-traits",
 ]
 
+[[package]]
+name = "fax"
+version = "0.2.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "caf1079563223d5d59d83c85886a56e586cfd5c1a26292e971a0fa266531ac5a"
+
 [[package]]
 name = "fdeflate"
 version = "0.3.7"
@@ -252,6 +706,12 @@ version = "0.4.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b97b65636e5b9ef369943878ac74335ba1c55c1cb6adbf1e2c293c624248d693"
 
+[[package]]
+name = "find-msvc-tools"
+version = "0.1.14"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "aedcfb3409746eddb02b9e19ebda1c3394f759a152e48ee875a0844d1b955484"
+
 [[package]]
 name = "flate2"
 version = "1.1.10"
@@ -284,6 +744,33 @@ dependencies = [
  "bytemuck",
 ]
 
+[[package]]
+name = "foreign-types"
+version = "0.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d737d9aa519fb7b749cbc3b962edcf310a8dd1f4b67c91c4f83975dbdd17d965"
+dependencies = [
+ "foreign-types-macros",
+ "foreign-types-shared",
+]
+
+[[package]]
+name = "foreign-types-macros"
+version = "0.2.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ea5190182e6915eb873ddbc16e23b711b6eb1f9c00a0d0a3a91b5f6228475225"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 3.0.6",
+]
+
+[[package]]
+name = "foreign-types-shared"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "aa9a19cbb55df58761df49b23516a86d432839add4af60fc256da840f66ed35b"
+
 [[package]]
 name = "futures-core"
 version = "0.3.34"
@@ -308,6 +795,38 @@ dependencies = [
  "slab",
 ]
 
+[[package]]
+name = "gethostname"
+version = "1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1bd49230192a3797a9a4d6abe9b3eed6f7fa4c8a8a4947977c6f80025f92cbd8"
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+ "libc",
+ "r-efi",
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+dependencies = [
+ "khronos_api",
+ "log",
+ "xml-rs",
+]
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@@ -316,7 +835,7 @@ checksum = "ed4a1bb24121291d27230c1b1b44e07d6a9b28cefdb32fe1581dfb84e14f940a"
 dependencies = [
  "bytemuck",
  "foldhash",
- "hashbrown",
+ "hashbrown 0.17.1",
  "log",
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  "skrifa",
@@ -324,6 +843,41 @@ dependencies = [
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 ]
 
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+dependencies = [
+ "js-sys",
+ "slotmap",
+ "wasm-bindgen",
+ "web-sys",
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+dependencies = [
+ "gl_generator",
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+
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+ "log",
+ "presser",
+ "thiserror 2.0.21",
+ "windows",
+]
+
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@@ -333,6 +887,18 @@ dependencies = [
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+dependencies = [
+ "cfg-if",
+ "crunchy",
+ "num-traits",
+ "zerocopy",
+]
+
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@@ -345,6 +911,17 @@ dependencies = [
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+dependencies = [
+ "allocator-api2",
+ "equivalent",
+ "foldhash",
+]
+
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@@ -354,12 +931,42 @@ dependencies = [
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+ "moxcms",
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+ "tiff",
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+dependencies = [
+ "equivalent",
+ "hashbrown 0.17.1",
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+
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@@ -369,6 +976,74 @@ dependencies = [
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+dependencies = [
+ "getrandom",
+ "libc",
+]
+
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@@ -380,6 +1055,33 @@ dependencies = [
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+ "accesskit_consumer",
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+
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+dependencies = [
+ "libc",
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@@ -450,6 +1213,84 @@ dependencies = [
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+ "block2 0.5.1",
+ "objc2 0.5.3",
+ "objc2-core-location",
+ "objc2-foundation 0.2.2",
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+dependencies = [
+ "num-traits",
+]
+
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@@ -489,7 +1681,7 @@ checksum = "2621685985a2ebf1c516881c026032ac7deafcda1a2c9b7850dc81e3dfcb64c1"
 dependencies = [
  "cfg-if",
  "libc",
- "redox_syscall",
+ "redox_syscall 0.5.18",
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@@ -507,18 +1699,56 @@ dependencies = [
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+
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@@ -532,6 +1762,39 @@ dependencies = [
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+dependencies = [
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+ "crc32fast",
+ "fdeflate",
+ "flate2",
+ "miniz_oxide 0.8.9",
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+dependencies = [
+ "cfg-if",
+ "concurrent-queue",
+ "hermit-abi",
+ "pin-project-lite",
+ "rustix 1.1.5",
+ "windows-sys 0.61.2",
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+
 [[package]]
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@@ -541,6 +1804,36 @@ dependencies = [
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+
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+checksum = "10ab3eb7f3becc3a1cbc4f2c6f20267996cfc1a6467a873763411b136a122715"
+dependencies = [
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+
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+dependencies = [
+ "toml_edit",
+]
+
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@@ -556,6 +1849,27 @@ version = "1.0.18"
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+
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+
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+checksum = "e660451e55124f798a69a5af3f49ccfbefbd41910eefd25caf2393e1f3473ec1"
+dependencies = [
+ "memchr",
+]
+
 [[package]]
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@@ -565,6 +1879,36 @@ dependencies = [
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+[[package]]
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+
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+
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+
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+ "objc2 0.6.5",
+ "objc2-core-foundation",
+ "objc2-foundation 0.3.2",
+ "objc2-quartz-core 0.3.2",
+]
+
 [[package]]
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@@ -576,6 +1920,15 @@ dependencies = [
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 ]
 
+[[package]]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4722d768eff46b75989dd134e5c353f0d6296e5aaa3132e776cbdb56be7731aa"
+dependencies = [
+ "bitflags 1.3.2",
+]
+
 [[package]]
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 version = "0.5.18"
@@ -585,6 +1938,21 @@ dependencies = [
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+[[package]]
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+checksum = "737970939a87c6fa31e7acad13307bccbb017a073b695b6089a2c484f929e20e"
+dependencies = [
+ "bitflags 2.13.2",
+]
+
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+
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@@ -614,12 +1982,74 @@ version = "0.20.0"
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 checksum = "6c20b6793b5c2fa6553b250154b78d6d0db37e72700ae35fad9387a46f487c97"
 
+[[package]]
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+
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+
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+checksum = "cfcb3a22ef46e85b45de6ee7e79d063319ebb6594faafcf1c225ea92ab6e9b92"
+dependencies = [
+ "semver",
+]
+
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+dependencies = [
+ "bitflags 2.13.2",
+ "errno",
+ "libc",
+ "linux-raw-sys 0.4.15",
+ "windows-sys 0.59.0",
+]
+
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+dependencies = [
+ "bitflags 2.13.2",
+ "errno",
+ "libc",
+ "linux-raw-sys 0.12.1",
+ "windows-sys 0.61.2",
+]
+
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+[[package]]
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+checksum = "93fc1dc3aaa9bfed95e02e6eadabb4baf7e3078b0bd1b4d7b6b0b68378900502"
+dependencies = [
+ "winapi-util",
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+
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+
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@@ -632,12 +2062,79 @@ version = "1.3.0"
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+[[package]]
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+dependencies = [
+ "serde_core",
+ "serde_derive",
+]
+
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+
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+ "syn 3.0.6",
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+
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+dependencies = [
+ "rustc_version",
+ "simdutf8",
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+
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+ "wayland-protocols-experimental",
+ "wayland-protocols-misc",
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+dependencies = [
+ "rustc-hash 2.1.3",
+]
+
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+
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@@ -820,7 +2515,7 @@ dependencies = [
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- "thiserror",
+ "thiserror 2.0.21",
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 dependencies = [
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+dependencies = [
+ "same-file",
+ "winapi-util",
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+
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+ "js-sys",
+ "tokio",
+ "wasm-bindgen",
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+
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+ "xkeysym",
+]
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 version = "0.1.0"
@@ -933,3 +3345,18 @@ name = "zlib-rs"
 version = "0.6.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b268e58e7c693d7c271f93ffc4ba3b380412554231c85bf61ca7af91042a4112"
+
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+
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+checksum = "27bc9d5b815bc103f142aa054f561d9187d191692ec7c2d1e2b4737f8dbd7296"
+dependencies = [
+ "zune-core",
+]
diff --git a/crates/ui/Cargo.toml b/crates/ui/Cargo.toml
index 3f777fb..4814658 100644
--- a/crates/ui/Cargo.toml
+++ b/crates/ui/Cargo.toml
@@ -15,3 +15,5 @@ egui = { workspace = true }
 
 [dev-dependencies]
 egui_extras = { version = "0.36", default-features = false, features = ["svg"] }
+egui_kittest = { version = "0.36", features = ["wgpu"] }
+image = { version = "0.25", default-features = false, features = ["png"] }
diff --git a/crates/ui/README.md b/crates/ui/README.md
index ba00763..4bd7167 100644
--- a/crates/ui/README.md
+++ b/crates/ui/README.md
@@ -2,7 +2,7 @@
 
 `craft-ui` provides small egui components with application-supplied styles. `icons` prepares
 embedded SVG catalogs; `buttons` paints accessible icon buttons; `tabs` handles tab fitting and
-interaction; `layout` provides split geometry and resize handles; `theme` shares widget-state styling.
+interaction; `layout` provides toolbar fitting, split geometry and resize handles; `theme` shares widget-state styling.
 Adapters cover all twelve Rust Craft apps; the [suite audit](../../docs/ui-components-audit.md#adoption-and-acceptance)
 records their scope and acceptance limits. Assets, complete themes, localization and command handling
 remain in each application. No icons, fonts or application engines are bundled.
@@ -153,6 +153,20 @@ or use an application-specific adapter. The library does not persist geometry, d
 or create panes. Apps keep their existing dock trees, stacked panels, layout files, pane contents,
 cameras, document focus and native windows. Shared controls do not constitute a dock-tree migration.
 
+## Toolbar overflow
+
+`layout::fit_toolbar(natural_widths, available, spacing, overflow_width)` keeps an ordered
+prefix of indivisible groups at their natural widths. When groups do not fit, it reserves the
+full overflow-control width and the preceding gap. `ToolbarFit` contains visible `(index, width)`
+pairs, overflow indices and the reserved width. It does not skip wide groups or compress controls.
+
+The application paints an enabled, focusable overflow control and makes every overflow index
+available in its menu through existing commands. Group identity, labels, selection and command
+dispatch remain local. An empty input produces an empty fit. Invalid dimensions, more than 4096
+groups, or an available width too small for the overflow control return `None`; the caller must
+then provide a scrollable row, wrapping or an existing application menu. Never turn that result
+into silently missing commands. See the API documentation for the accepted numeric bounds.
+
 ## Theme mechanisms
 
 `theme::WidgetPalette` applies background colors to egui's five widget states, with a supplied
@@ -190,3 +204,11 @@ cargo clippy --workspace --all-targets -- -D warnings
 cargo test --workspace
 cargo check --target wasm32-unknown-unknown -p craft-ui
 ```
+
+The [visual regression suite](../../docs/ui-visual-regressions.md) compares the actual controls
+against independent reference painters, including exact mesh and RGBA checks, and proves that
+color, spacing and stroke changes fail those comparisons. To retain reviewable PNG pairs:
+
+```sh
+CRAFT_UI_VISUAL_DIR=/absolute/path/to/visuals cargo test -p craft-ui --test visual_regression
+```
diff --git a/crates/ui/src/layout/mod.rs b/crates/ui/src/layout/mod.rs
index 36cac8b..335dd07 100644
--- a/crates/ui/src/layout/mod.rs
+++ b/crates/ui/src/layout/mod.rs
@@ -6,9 +6,11 @@
 
 mod geometry;
 mod resize;
+mod toolbar;
 
 pub use geometry::{SplitAxis, SplitLayout, SplitSize, split_rect};
 pub use resize::{ResizeHandle, ResizeHandleStyle, ResizeResponse};
+pub use toolbar::{ToolbarFit, fit_toolbar};
 
 #[cfg(test)]
 mod tests;
diff --git a/crates/ui/src/layout/toolbar.rs b/crates/ui/src/layout/toolbar.rs
new file mode 100644
index 0000000..d03019e
--- /dev/null
+++ b/crates/ui/src/layout/toolbar.rs
@@ -0,0 +1,152 @@
+/// Visible toolbar groups and the groups to present in an application-owned overflow menu.
+///
+/// Groups stay at their natural widths, in their original order. This helper does not paint,
+/// hide commands, create a menu, or change widget identity. The caller must make every index in
+/// `overflow` available through an enabled, focusable overflow control and its menu.
+#[derive(Clone, Debug, Default, PartialEq)]
+pub struct ToolbarFit {
+    /// A leading sequence of `(input index, natural width)` pairs. Groups are never compressed.
+    pub shown: Vec<(usize, f32)>,
+    /// Remaining input indices, in order. Empty when the whole toolbar fits.
+    pub overflow: Vec<usize>,
+    /// Full requested overflow-control width when needed, otherwise zero.
+    pub overflow_width: f32,
+}
+
+const MAX_GROUPS: usize = 4096;
+const MAX_EXTENT: f32 = 1_000_000.0;
+
+fn nonnegative_extent(value: f32) -> bool {
+    value.is_finite() && (0.0..=MAX_EXTENT).contains(&value)
+}
+
+/// Fit indivisible toolbar groups and, when needed, a full-size overflow control.
+///
+/// `spacing` is included between adjacent visible groups and before the overflow control. The
+/// result preserves a leading sequence instead of skipping a wide group to show later commands.
+/// An empty input returns an empty fit. At most 4096 groups and dimensions at most one million
+/// logical points are accepted; all dimensions must be finite, widths strictly positive, and
+/// `available` and `spacing` nonnegative. Work and storage are bounded and linear in group count.
+///
+/// Returns `None` for invalid input or if overflow is needed but `available` is smaller than
+/// `overflow_width`. The caller must then use an explicit alternative such as a scrollable row,
+/// wrapping, or an existing application menu; do not silently hide the commands. A positive
+/// overflow-control width is required even when the current groups happen to fit.
+pub fn fit_toolbar(natural: &[f32], available: f32, spacing: f32, overflow_width: f32) -> Option<ToolbarFit> {
+    if natural.len() > MAX_GROUPS
+        || !nonnegative_extent(available)
+        || !nonnegative_extent(spacing)
+        || !nonnegative_extent(overflow_width)
+        || overflow_width == 0.0
+        || natural.iter().any(|&width| !nonnegative_extent(width) || width == 0.0)
+    {
+        return None;
+    }
+    let gaps = natural.len().saturating_sub(1);
+    let total = natural.iter().map(|&width| f64::from(width)).sum::<f64>() + f64::from(spacing) * gaps as f64;
+    if total <= f64::from(available) {
+        return Some(ToolbarFit { shown: natural.iter().copied().enumerate().collect(), ..Default::default() });
+    }
+    if available < overflow_width {
+        return None;
+    }
+    let budget = f64::from(available) - f64::from(overflow_width);
+    let mut used = 0.0;
+    let shown_count = natural
+        .iter()
+        .take_while(|&&width| {
+            // Every shown group has a following gap: to the next group or to the overflow.
+            let next = used + f64::from(width) + f64::from(spacing);
+            if next <= budget {
+                used = next;
+                true
+            } else {
+                false
+            }
+        })
+        .count();
+    Some(ToolbarFit {
+        shown: natural.iter().copied().take(shown_count).enumerate().collect(),
+        overflow: (shown_count..natural.len()).collect(),
+        overflow_width,
+    })
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn exact_fit_keeps_every_natural_width_and_needs_no_overflow() {
+        assert_eq!(
+            fit_toolbar(&[24.0, 36.0, 48.0], 120.0, 6.0, 20.0),
+            Some(ToolbarFit { shown: vec![(0, 24.0), (1, 36.0), (2, 48.0)], overflow: vec![], overflow_width: 0.0 })
+        );
+        assert_eq!(fit_toolbar(&[], 0.0, 6.0, 20.0), Some(ToolbarFit::default()));
+    }
+
+    #[test]
+    fn overflow_reserves_its_control_and_the_preceding_spacing() {
+        assert_eq!(
+            fit_toolbar(&[24.0, 36.0, 48.0], 96.0, 4.0, 20.0),
+            Some(ToolbarFit { shown: vec![(0, 24.0), (1, 36.0)], overflow: vec![2], overflow_width: 20.0 })
+        );
+        // At 87 points the second group and its gap would overlap the overflow control.
+        assert_eq!(
+            fit_toolbar(&[24.0, 36.0, 48.0], 87.0, 4.0, 20.0),
+            Some(ToolbarFit { shown: vec![(0, 24.0)], overflow: vec![1, 2], overflow_width: 20.0 })
+        );
+    }
+
+    #[test]
+    fn a_wide_first_group_is_not_compressed_or_skipped() {
+        assert_eq!(
+            fit_toolbar(&[200.0, 24.0, 24.0], 120.0, 4.0, 20.0),
+            Some(ToolbarFit { shown: vec![], overflow: vec![0, 1, 2], overflow_width: 20.0 })
+        );
+        assert_eq!(fit_toolbar(&[200.0], 60.0, 4.0, 20.0), Some(ToolbarFit { shown: vec![], overflow: vec![0], overflow_width: 20.0 }));
+    }
+
+    #[test]
+    fn tiny_rows_require_a_real_fallback_instead_of_an_inaccessible_button() {
+        for available in [0.0, 1.0, 19.999] {
+            assert_eq!(fit_toolbar(&[30.0, 30.0], available, 4.0, 20.0), None);
+        }
+        assert_eq!(fit_toolbar(&[30.0, 30.0], 20.0, 4.0, 20.0), Some(ToolbarFit { shown: vec![], overflow: vec![0, 1], overflow_width: 20.0 }));
+        assert!(fit_toolbar(&[10.0], 10.0, 4.0, 20.0).unwrap().overflow.is_empty());
+    }
+
+    #[test]
+    fn malformed_dimensions_and_excessive_group_counts_are_rejected() {
+        for value in [f32::NAN, f32::INFINITY, f32::NEG_INFINITY, -1.0, MAX_EXTENT + 1.0, f32::MAX] {
+            assert_eq!(fit_toolbar(&[24.0], value, 4.0, 20.0), None);
+            assert_eq!(fit_toolbar(&[24.0], 100.0, value, 20.0), None);
+            assert_eq!(fit_toolbar(&[24.0], 100.0, 4.0, value), None);
+            assert_eq!(fit_toolbar(&[value], 100.0, 4.0, 20.0), None);
+        }
+        assert_eq!(fit_toolbar(&[0.0], 100.0, 4.0, 20.0), None);
+        assert_eq!(fit_toolbar(&[24.0], 100.0, 4.0, 0.0), None);
+        assert!(fit_toolbar(&vec![24.0; MAX_GROUPS], MAX_EXTENT, 4.0, 20.0).is_some());
+        assert_eq!(fit_toolbar(&vec![24.0; MAX_GROUPS + 1], MAX_EXTENT, 4.0, 20.0), None);
+    }
+
+    #[test]
+    fn every_group_remains_reachable_and_every_accepted_fit_stays_within_budget() {
+        let widths = [12.5, 28.0, 24.25, 58.0, 32.0];
+        for available in [20.0, 31.5, 37.0, 55.0, 93.5, 156.0, 500.0, MAX_EXTENT] {
+            for spacing in [0.0, 0.5, 4.0, 12.0] {
+                let fit = fit_toolbar(&widths, available, spacing, 20.0).unwrap();
+                let indices: Vec<_> = fit.shown.iter().map(|&(i, _)| i).chain(fit.overflow.iter().copied()).collect();
+                assert_eq!(indices, [0, 1, 2, 3, 4]);
+                for &(index, width) in &fit.shown {
+                    assert_eq!(width.to_bits(), widths[index].to_bits());
+                }
+                let count = fit.shown.len() + usize::from(!fit.overflow.is_empty());
+                let used = fit.shown.iter().map(|&(_, width)| f64::from(width)).sum::<f64>()
+                    + f64::from(fit.overflow_width)
+                    + count.saturating_sub(1) as f64 * f64::from(spacing);
+                assert!(used <= f64::from(available), "{fit:?} uses {used} of {available}");
+            }
+        }
+    }
+}
diff --git a/crates/ui/tests/visual/fixtures.rs b/crates/ui/tests/visual/fixtures.rs
new file mode 100644
index 0000000..e9c6da2
--- /dev/null
+++ b/crates/ui/tests/visual/fixtures.rs
@@ -0,0 +1,327 @@
+//! Independent, font-free reference painting for the shared controls' public visual contracts.
+//! Reference paths never call craft-ui or derive their expected rectangles from its responses.
+
+use craft_ui::buttons::{ButtonVisuals, IconButton, IconButtonStyle};
+use craft_ui::layout::{ResizeHandle, ResizeHandleStyle, SplitAxis, SplitSize, split_rect};
+use craft_ui::tabs::Tab;
+use egui::{Align, Color32, CornerRadius, Id, Layout, Painter, Rect, Response, Stroke, StrokeKind, Ui, UiBuilder, Vec2, pos2, vec2};
+
+pub const CANVAS: Vec2 = vec2(128.0, 72.0);
+pub const GAP: f32 = 8.0;
+
+#[derive(Clone, Copy, Debug)]
+pub enum Theme {
+    Light,
+    Dark,
+}
+
+impl Theme {
+    pub fn name(self) -> &'static str {
+        match self {
+            Self::Light => "light",
+            Self::Dark => "dark",
+        }
+    }
+
+    pub fn egui(self) -> egui::Theme {
+        match self {
+            Self::Light => egui::Theme::Light,
+            Self::Dark => egui::Theme::Dark,
+        }
+    }
+
+    pub fn surface(self) -> Color32 {
+        match self {
+            Self::Light => Color32::from_rgb(248, 250, 252),
+            Self::Dark => Color32::from_rgb(17, 24, 39),
+        }
+    }
+
+    pub fn palette(self) -> Palette {
+        let rgb = |[r, g, b]: [u8; 3]| Color32::from_rgb(r, g, b);
+        let colors = match self {
+            Self::Light => [
+                [226, 232, 240],
+                [186, 230, 253],
+                [125, 211, 252],
+                [37, 99, 235],
+                [148, 163, 184],
+                [15, 23, 42],
+                [12, 74, 110],
+                [8, 47, 73],
+                [220, 38, 38],
+            ],
+            Self::Dark => [
+                [31, 41, 55],
+                [55, 65, 81],
+                [75, 85, 99],
+                [67, 56, 202],
+                [100, 116, 139],
+                [226, 232, 240],
+                [243, 244, 246],
+                [255, 255, 255],
+                [56, 189, 248],
+            ],
+        };
+        Palette {
+            normal: rgb(colors[0]),
+            hovered: rgb(colors[1]),
+            pressed: rgb(colors[2]),
+            selected: rgb(colors[3]),
+            border: rgb(colors[4]),
+            icon: rgb(colors[5]),
+            hover_icon: rgb(colors[6]),
+            press_icon: rgb(colors[7]),
+            focus: rgb(colors[8]),
+        }
+    }
+}
+
+#[derive(Clone, Copy)]
+pub struct Palette {
+    pub normal: Color32,
+    pub hovered: Color32,
+    pub pressed: Color32,
+    pub selected: Color32,
+    pub border: Color32,
+    pub icon: Color32,
+    pub hover_icon: Color32,
+    pub press_icon: Color32,
+    pub focus: Color32,
+}
+
+#[derive(Clone, Copy, Debug, PartialEq, Eq)]
+pub enum State {
+    Normal,
+    Hover,
+    Press,
+    Selected,
+    SelectedPress,
+    Disabled,
+    Focus,
+}
+
+impl State {
+    pub const ALL: [Self; 7] = [Self::Normal, Self::Hover, Self::Press, Self::Selected, Self::SelectedPress, Self::Disabled, Self::Focus];
+
+    pub fn selected(self) -> bool {
+        matches!(self, Self::Selected | Self::SelectedPress)
+    }
+
+    pub fn pressed(self) -> bool {
+        matches!(self, Self::Press | Self::SelectedPress)
+    }
+
+    pub fn pointer(self) -> bool {
+        matches!(self, Self::Hover | Self::Press | Self::SelectedPress | Self::Disabled)
+    }
+
+    pub fn enabled(self) -> bool {
+        self != Self::Disabled
+    }
+}
+
+#[derive(Clone, Copy, Debug)]
+pub enum Component {
+    Button,
+    SingleShapeButton,
+    Tab,
+    HorizontalSplit,
+    VerticalSplit,
+}
+
+impl Component {
+    pub const ALL: [Self; 5] = [Self::Button, Self::SingleShapeButton, Self::Tab, Self::HorizontalSplit, Self::VerticalSplit];
+
+    pub fn is_split(self) -> bool {
+        matches!(self, Self::HorizontalSplit | Self::VerticalSplit)
+    }
+}
+
+#[derive(Clone, Copy, Debug)]
+pub struct Case {
+    pub component: Component,
+    pub state: State,
+    pub theme: Theme,
+    pub scale: f32,
+    pub compact: bool,
+}
+
+impl Case {
+    pub fn name(self) -> String {
+        format!("{:?}-{:?}-{}-{}-{}x", self.component, self.state, self.theme.name(), if self.compact { "compact" } else { "normal" }, self.scale)
+    }
+
+    pub fn size(self) -> Vec2 {
+        match (self.component, self.compact) {
+            (Component::Tab, false) => vec2(44.0, 28.0),
+            (Component::Tab, true) => vec2(22.0, 12.0),
+            (_, false) => vec2(36.0, 28.0),
+            (_, true) => vec2(18.0, 12.0),
+        }
+    }
+
+    pub fn control_rect(self) -> Rect {
+        if self.component.is_split() { reference_split(self).1 } else { Rect::from_min_size(pos2(12.0, 12.0), self.size()) }
+    }
+}
+
+#[derive(Clone, Copy, Debug, PartialEq, Eq)]
+pub enum Mutation {
+    None,
+    Color,
+    Spacing,
+    Stroke,
+}
+
+pub fn button_style(theme: Theme) -> IconButtonStyle {
+    let p = theme.palette();
+    let visual = |fill, icon| ButtonVisuals { fill, icon, stroke: Stroke::new(1.0, p.border) };
+    IconButtonStyle {
+        normal: visual(p.normal, p.icon),
+        hovered: visual(p.hovered, p.hover_icon),
+        pressed: Some(visual(p.pressed, p.press_icon)),
+        selected: visual(p.selected, Color32::WHITE),
+        corner_radius: CornerRadius::same(3),
+        focus_stroke: Stroke::new(1.0, p.focus),
+    }
+}
+
+pub fn icon(painter: &Painter, rect: Rect, color: Color32, compact: bool) {
+    let half = if compact { vec2(3.0, 2.0) } else { vec2(6.0, 4.0) };
+    painter.line_segment([rect.center() - half, rect.center() + half], Stroke::new(1.0, color));
+    painter.line_segment([rect.center() + vec2(-half.x, half.y), rect.center() + vec2(half.x, -half.y)], Stroke::new(1.0, color));
+}
+
+fn tab_body(ui: &Ui, response: &Response, selected: bool, palette: Palette, compact: bool) {
+    let (fill, tint) = if selected {
+        (palette.selected, Color32::WHITE)
+    } else if response.is_pointer_button_down_on() {
+        (palette.pressed, palette.press_icon)
+    } else if response.hovered() {
+        (palette.hovered, palette.hover_icon)
+    } else {
+        (palette.normal, palette.icon)
+    };
+    ui.painter().rect_filled(response.rect, 0.0, fill);
+    ui.painter().rect_stroke(response.rect, 0.0, Stroke::new(1.0, palette.border), StrokeKind::Inside);
+    icon(ui.painter(), response.rect, tint, compact);
+}
+
+/// Actual production components, driven through egui responses and app-supplied fixture styles.
+pub fn actual(ui: &mut Ui, case: Case, mutation: Mutation) -> Vec<Response> {
+    let p = case.theme.palette();
+    if case.component.is_split() {
+        let axis = if matches!(case.component, Component::HorizontalSplit) { SplitAxis::Horizontal } else { SplitAxis::Vertical };
+        let area = Rect::from_min_size(pos2(12.0, 12.0), if case.compact { vec2(52.0, 20.0) } else { vec2(104.0, 44.0) });
+        let split =
+            split_rect(area, axis, SplitSize::Ratio(if case.compact { 0.5 } else { 0.375 }), if case.compact { 3.0 } else { 4.0 }, 4.0).unwrap();
+        ui.painter().rect_filled(split.first, 0.0, p.normal);
+        ui.painter().rect_filled(split.second, 0.0, p.hovered);
+        let response = ui
+            .add_enabled_ui(case.state.enabled(), |ui| {
+                ResizeHandle::new(
+                    Id::new("visual-divider"),
+                    axis,
+                    split.divider,
+                    "Resize panes",
+                    ResizeHandleStyle { hovered: p.hovered, dragged: p.pressed, focused: p.focus },
+                )
+                .hit_margin(0.0)
+                .show(ui)
+                .response
+            })
+            .inner;
+        return vec![response];
+    }
+    let spacing = GAP + if mutation == Mutation::Spacing { 1.0 } else { 0.0 };
+    let mut style = button_style(case.theme);
+    if mutation == Mutation::Color {
+        style.normal.fill = Color32::from_rgb(200, 60, 130);
+    }
+    if mutation == Mutation::Stroke {
+        style.normal.stroke.width = 2.0;
+    }
+    let mut responses = Vec::new();
+    ui.scope_builder(
+        UiBuilder::new().max_rect(Rect::from_min_size(pos2(12.0, 12.0), CANVAS - vec2(24.0, 24.0))).layout(Layout::left_to_right(Align::Min)),
+        |ui| {
+            ui.spacing_mut().item_spacing.x = spacing;
+            ui.add_enabled_ui(case.state.enabled(), |ui| {
+                for index in 0..2 {
+                    let selected = index == 0 && case.state.selected();
+                    let response = if matches!(case.component, Component::Tab) {
+                        let rect = Rect::from_min_size(pos2(12.0 + index as f32 * (case.size().x + spacing), 12.0), case.size());
+                        Tab::new(Id::new(("visual-tab", index)), "Tab", selected)
+                            .focus_stroke(style.focus_stroke)
+                            .show_at(ui, rect, |ui, r| tab_body(ui, r, selected, p, case.compact))
+                    } else {
+                        let button = IconButton::new("Action", case.size(), &style).selected(selected);
+                        let button = if matches!(case.component, Component::SingleShapeButton) { button.single_shape_frame() } else { button };
+                        button.show(ui, |ui, rect, tint| icon(ui.painter(), rect, tint, case.compact))
+                    };
+                    responses.push(response);
+                }
+            });
+        },
+    );
+    responses
+}
+
+/// Fixed reference geometry, written independently of split_rect's implementation.
+fn reference_split(case: Case) -> (Rect, Rect, Rect) {
+    let rect = |x, y, w, h| Rect::from_min_size(pos2(x, y), vec2(w, h));
+    match (case.component, case.compact) {
+        (Component::HorizontalSplit, false) => (rect(12.0, 12.0, 37.5, 44.0), rect(49.5, 12.0, 4.0, 44.0), rect(53.5, 12.0, 62.5, 44.0)),
+        (Component::HorizontalSplit, true) => (rect(12.0, 12.0, 24.5, 20.0), rect(36.5, 12.0, 3.0, 20.0), rect(39.5, 12.0, 24.5, 20.0)),
+        (Component::VerticalSplit, false) => (rect(12.0, 12.0, 104.0, 15.0), rect(12.0, 27.0, 104.0, 4.0), rect(12.0, 31.0, 104.0, 25.0)),
+        (Component::VerticalSplit, true) => (rect(12.0, 12.0, 52.0, 8.5), rect(12.0, 20.5, 52.0, 3.0), rect(12.0, 23.5, 52.0, 8.5)),
+        _ => panic!("split fixture required"),
+    }
+}
+
+/// Baseline painting uses only egui shapes, literal fixture geometry, and the specified state.
+pub fn reference(ui: &Ui, case: Case) {
+    let p = case.theme.palette();
+    if case.component.is_split() {
+        let (first, divider, second) = reference_split(case);
+        ui.painter().rect_filled(first, 0.0, p.normal);
+        ui.painter().rect_filled(second, 0.0, p.hovered);
+        let fill = match case.state {
+            State::Hover => Some(p.hovered),
+            State::Press => Some(p.pressed),
+            State::Focus => Some(p.focus),
+            _ => None,
+        };
+        if let Some(fill) = fill {
+            ui.painter().rect_filled(divider, 0.0, fill);
+        }
+        return;
+    }
+    let mut painter = ui.painter().clone();
+    if case.state == State::Disabled {
+        // The fixture's known disabled alpha. Do not ask the actual widget how it was painted.
+        painter.multiply_opacity(0.4);
+    }
+    for index in 0..2 {
+        let state = if index == 0 { case.state } else { State::Normal };
+        let (fill, tint) = match state {
+            State::Selected | State::SelectedPress => (p.selected, Color32::WHITE),
+            State::Press => (p.pressed, p.press_icon),
+            State::Hover => (p.hovered, p.hover_icon),
+            _ => (p.normal, p.icon),
+        };
+        let rect = Rect::from_min_size(pos2(12.0 + index as f32 * (case.size().x + GAP), 12.0), case.size());
+        let radius = if matches!(case.component, Component::Tab) { 0 } else { 3 };
+        if matches!(case.component, Component::SingleShapeButton) {
+            painter.rect(rect, radius, fill, Stroke::new(1.0, p.border), StrokeKind::Inside);
+        } else {
+            painter.rect_filled(rect, radius, fill);
+            painter.rect_stroke(rect, radius, Stroke::new(1.0, p.border), StrokeKind::Inside);
+        }
+        icon(&painter, rect, tint, case.compact);
+        if state == State::Focus {
+            painter.rect_stroke(rect.shrink(2.0), radius, Stroke::new(1.0, p.focus), StrokeKind::Inside);
+        }
+    }
+}
diff --git a/crates/ui/tests/visual_regression.rs b/crates/ui/tests/visual_regression.rs
new file mode 100644
index 0000000..532c9df
--- /dev/null
+++ b/crates/ui/tests/visual_regression.rs
@@ -0,0 +1,394 @@
+//! Exact offscreen rendering comparisons against independent reference painters.
+//!
+//! These are paired same-renderer comparisons, not portable GPU golden files. The reference
+//! paths deliberately do not call the shared components. Literal geometry and colors specify
+//! the baseline; deliberate mutations prove color, spacing and stroke regressions are caught.
+//! Set CRAFT_UI_VISUAL_DIR to retain bounded before/after/difference PNGs and comparison tables.
+
+#[path = "visual/fixtures.rs"]
+mod fixtures;
+
+use std::path::PathBuf;
+
+use egui::{Color32, Context, Event, FullOutput, Modifiers, PointerButton, Pos2, RawInput, Rect, Response, TextureId, Ui};
+use egui_kittest::{TestRenderer, wgpu::WgpuTestRenderer};
+use fixtures::{CANVAS, Case, Component, Mutation, State, Theme};
+use image::{Rgba, RgbaImage};
+
+#[derive(Debug, PartialEq)]
+struct Mesh {
+    clip: Rect,
+    texture: TextureId,
+    indices: Vec<u32>,
+    vertices: Vec<(Pos2, Pos2, Color32)>,
+}
+
+struct Capture {
+    image: RgbaImage,
+    meshes: Option<Vec<Mesh>>,
+}
+
+fn context(theme: Theme, scale: f32) -> Context {
+    let ctx = Context::default();
+    ctx.set_theme(theme.egui());
+    ctx.set_pixels_per_point(scale);
+    ctx.set_fonts(egui::FontDefinitions::empty());
+    ctx.all_styles_mut(|style| {
+        style.animation_time = 0.0;
+        style.visuals.text_cursor.blink = false;
+        style.visuals.disabled_alpha = 0.4;
+    });
+    ctx
+}
+
+fn raw_input(frame: usize, events: Vec<Event>) -> RawInput {
+    RawInput {
+        screen_rect: Some(Rect::from_min_size(Pos2::ZERO, CANVAS)),
+        time: Some(frame as f64 / 60.0),
+        events,
+        max_texture_side: Some(2048),
+        ..Default::default()
+    }
+}
+
+fn background(ui: &mut Ui, theme: Theme) {
+    let screen = Rect::from_min_size(Pos2::ZERO, CANVAS);
+    ui.set_clip_rect(screen);
+    ui.painter().rect_filled(screen, 0.0, theme.surface());
+}
+
+fn finish_capture(renderer: &mut WgpuTestRenderer, ctx: &Context, output: &FullOutput) -> Capture {
+    let meshes = ctx
+        .tessellate(output.shapes.clone(), output.pixels_per_point)
+        .into_iter()
+        .map(|clipped| {
+            let egui::epaint::Primitive::Mesh(mesh) = clipped.primitive else { panic!("visual fixtures must not contain paint callbacks") };
+            Mesh {
+                clip: clipped.clip_rect,
+                texture: mesh.texture_id,
+                indices: mesh.indices,
+                vertices: mesh.vertices.into_iter().map(|vertex| (vertex.pos, vertex.uv, vertex.color)).collect(),
+            }
+        })
+        .collect();
+    let image = renderer.render(ctx, output).expect("offscreen renderer is required for the visual suite");
+    assert!(image.width() > 0 && image.height() > 0 && image.width() <= 256 && image.height() <= 144);
+    Capture { image, meshes: Some(meshes) }
+}
+
+fn capture(renderer: &mut WgpuTestRenderer, case: Case, reference: bool, mutation: Mutation) -> Capture {
+    let ctx = context(case.theme, case.scale);
+    let mut output = FullOutput::default();
+    let mut responses: Vec<Response> = Vec::new();
+    for frame in 0..4 {
+        let mut events = Vec::new();
+        if !reference && frame == 2 {
+            if case.state == State::Focus {
+                ctx.memory_mut(|memory| memory.request_focus(responses[0].id));
+            }
+            if case.state.pointer() {
+                let center = case.control_rect().center();
+                events.push(Event::PointerMoved(center));
+                if case.state.pressed() {
+                    events.push(Event::PointerButton { pos: center, button: PointerButton::Primary, pressed: true, modifiers: Modifiers::NONE });
+                }
+            }
+        }
+        output = ctx.run_ui(raw_input(frame, events), |ui| {
+            background(ui, case.theme);
+            if reference {
+                fixtures::reference(ui, case);
+            } else {
+                responses = fixtures::actual(ui, case, mutation);
+            }
+        });
+        renderer.handle_delta(&mut output.textures_delta);
+    }
+    assert_eq!(output.pixels_per_point, case.scale);
+    if !reference {
+        let response = &responses[0];
+        assert_eq!(response.enabled(), case.state.enabled(), "{case:?}");
+        if case.state == State::Hover {
+            assert!(response.hovered(), "hover was not exercised: {case:?}");
+        }
+        if case.state.pressed() {
+            assert!(response.is_pointer_button_down_on(), "press was not exercised: {case:?}");
+            if case.component.is_split() {
+                assert!(response.dragged(), "divider drag was not exercised: {case:?}");
+            }
+        }
+        if case.state == State::Focus {
+            assert!(response.has_focus(), "focus was not exercised: {case:?}");
+        }
+        if case.state == State::Disabled {
+            assert!(!response.hovered() && !response.has_focus(), "disabled pointer input must remain inert: {case:?}");
+        }
+    }
+    finish_capture(renderer, &ctx, &output)
+}
+
+fn static_capture(renderer: &mut WgpuTestRenderer, theme: Theme, scale: f32, mut paint: impl FnMut(&mut Ui)) -> Capture {
+    let ctx = context(theme, scale);
+    let mut output = FullOutput::default();
+    for frame in 0..2 {
+        output = ctx.run_ui(raw_input(frame, vec![]), |ui| {
+            background(ui, theme);
+            paint(ui);
+        });
+        renderer.handle_delta(&mut output.textures_delta);
+    }
+    assert_eq!(output.pixels_per_point, scale);
+    finish_capture(renderer, &ctx, &output)
+}
+
+struct Artifacts {
+    directory: Option<PathBuf>,
+    rows: String,
+}
+
+impl Artifacts {
+    fn new(suite: &str) -> Self {
+        let directory = std::env::var_os("CRAFT_UI_VISUAL_DIR").map(|root| PathBuf::from(root).join(suite));
+        if let Some(directory) = &directory {
+            std::fs::create_dir_all(directory).unwrap();
+        }
+        Self { directory, rows: "case\twidth\theight\tchanged_pixels\tmesh_equal\texpected_change\n".into() }
+    }
+
+    fn record(&mut self, name: &str, before: &Capture, after: &Capture, expected_change: bool) -> usize {
+        assert_eq!(before.image.dimensions(), after.image.dimensions(), "{name}");
+        let mut changed = 0;
+        let mut difference = RgbaImage::new(before.image.width(), before.image.height());
+        for ((before, after), pixel) in before.image.pixels().zip(after.image.pixels()).zip(difference.pixels_mut()) {
+            if before != after {
+                changed += 1;
+                *pixel = Rgba([255, 0, 128, 255]);
+            }
+        }
+        let mesh_equal = match (&before.meshes, &after.meshes) {
+            (Some(before), Some(after)) => (before == after).to_string(),
+            (None, None) => "not_applicable".into(),
+            _ => panic!("both captures must have the same comparison scope"),
+        };
+        self.rows.push_str(&format!("{name}\t{}\t{}\t{changed}\t{mesh_equal}\t{expected_change}\n", before.image.width(), before.image.height()));
+        if let Some(directory) = &self.directory {
+            before.image.save(directory.join(format!("{name}-before.png"))).unwrap();
+            after.image.save(directory.join(format!("{name}-after.png"))).unwrap();
+            difference.save(directory.join(format!("{name}-difference.png"))).unwrap();
+            // Preserve completed rows even if a later assertion fails.
+            std::fs::write(directory.join("comparison.tsv"), &self.rows).unwrap();
+        }
+        changed
+    }
+}
+
+#[test]
+fn rendered_controls_match_independent_reference_pixels_and_meshes() {
+    let mut renderer = WgpuTestRenderer::new();
+    let mut artifacts = Artifacts::new("controls");
+    let mut count = 0;
+    for component in Component::ALL {
+        for state in State::ALL {
+            if component.is_split() && state.selected() {
+                continue; // A resize handle has no selected state in its public contract.
+            }
+            for theme in [Theme::Light, Theme::Dark] {
+                for scale in [1.0, 1.5, 2.0] {
+                    for compact in [false, true] {
+                        let case = Case { component, state, theme, scale, compact };
+                        let before = capture(&mut renderer, case, true, Mutation::None);
+                        let after = capture(&mut renderer, case, false, Mutation::None);
+                        let changed = artifacts.record(&case.name(), &before, &after, false);
+                        assert_eq!(before.meshes, after.meshes, "reference mesh mismatch: {case:?}");
+                        assert_eq!(changed, 0, "reference pixels changed: {case:?}");
+                        count += 1;
+                    }
+                }
+            }
+        }
+    }
+    assert_eq!(count, 372);
+    eprintln!("{count} control before/after pairs matched exact RGBA pixels and tessellated meshes");
+}
+
+#[test]
+fn visual_comparisons_detect_color_spacing_and_stroke_mutations() {
+    let mut renderer = WgpuTestRenderer::new();
+    let mut artifacts = Artifacts::new("negative-controls");
+    let mut count = 0;
+    for theme in [Theme::Light, Theme::Dark] {
+        for scale in [1.0, 1.5, 2.0] {
+            for compact in [false, true] {
+                let case = Case { component: Component::Button, state: State::Normal, theme, scale, compact };
+                let before = capture(&mut renderer, case, true, Mutation::None);
+                for mutation in [Mutation::Color, Mutation::Spacing, Mutation::Stroke] {
+                    let after = capture(&mut renderer, case, false, mutation);
+                    let changed = artifacts.record(&format!("{}-{mutation:?}", case.name()), &before, &after, true);
+                    assert_ne!(before.meshes, after.meshes, "mesh comparison missed {mutation:?}: {case:?}");
+                    assert!(changed > 0, "pixel comparison missed {mutation:?}: {case:?}");
+                    count += 1;
+                }
+            }
+        }
+    }
+    assert_eq!(count, 36);
+    eprintln!("{count} deliberate color/spacing/stroke changes were detected in both pixels and meshes");
+}
+
+#[test]
+fn toolbar_fitting_matches_literal_group_and_overflow_positions() {
+    use craft_ui::buttons::IconButton;
+    use craft_ui::layout::fit_toolbar;
+    use egui::{Align, Layout, Stroke, StrokeKind, UiBuilder, pos2, vec2};
+
+    let mut renderer = WgpuTestRenderer::new();
+    let mut artifacts = Artifacts::new("toolbar");
+    let mut count = 0;
+    // Independently specified rectangles: three natural groups, one group + More, More only.
+    for (available, expected) in
+        [(112.0, vec![(12.0, 24.0), (40.0, 28.0), (72.0, 36.0)]), (64.0, vec![(12.0, 24.0), (40.0, 20.0)]), (20.0, vec![(12.0, 20.0)])]
+    {
+        for theme in [Theme::Light, Theme::Dark] {
+            for scale in [1.0, 1.5, 2.0] {
+                let p = theme.palette();
+                let before = static_capture(&mut renderer, theme, scale, |ui| {
+                    for &(x, width) in &expected {
+                        let rect = Rect::from_min_size(pos2(x, 12.0), vec2(width, 24.0));
+                        ui.painter().rect_filled(rect, 3.0, p.normal);
+                        ui.painter().rect_stroke(rect, 3.0, Stroke::new(1.0, p.border), StrokeKind::Inside);
+                        fixtures::icon(ui.painter(), rect, p.icon, true);
+                    }
+                });
+                let after = static_capture(&mut renderer, theme, scale, |ui| {
+                    let fit = fit_toolbar(&[24.0, 28.0, 36.0], available, 4.0, 20.0).unwrap();
+                    let style = fixtures::button_style(theme);
+                    ui.scope_builder(
+                        UiBuilder::new()
+                            .max_rect(Rect::from_min_size(pos2(12.0, 12.0), vec2(available, 24.0)))
+                            .layout(Layout::left_to_right(Align::Min)),
+                        |ui| {
+                            ui.spacing_mut().item_spacing.x = 4.0;
+                            for &(_, width) in &fit.shown {
+                                IconButton::new("Group", vec2(width, 24.0), &style)
+                                    .show(ui, |ui, rect, tint| fixtures::icon(ui.painter(), rect, tint, true));
+                            }
+                            if !fit.overflow.is_empty() {
+                                IconButton::new("More", vec2(fit.overflow_width, 24.0), &style)
+                                    .show(ui, |ui, rect, tint| fixtures::icon(ui.painter(), rect, tint, true));
+                            }
+                        },
+                    );
+                });
+                let name = format!("toolbar-{available}-{}-{scale}x", theme.name());
+                let changed = artifacts.record(&name, &before, &after, false);
+                assert_eq!(before.meshes, after.meshes, "{name}");
+                assert_eq!(changed, 0, "{name}");
+                count += 1;
+            }
+        }
+    }
+    assert_eq!(count, 18);
+}
+
+#[test]
+fn widget_palette_renders_all_five_states_with_existing_borders_and_expansion() {
+    use craft_ui::theme::WidgetPalette;
+    use egui::{CornerRadius, Stroke, StrokeKind, pos2, vec2};
+
+    let mut renderer = WgpuTestRenderer::new();
+    let mut artifacts = Artifacts::new("widget-palette");
+    for theme in [Theme::Light, Theme::Dark] {
+        for scale in [1.0, 1.5, 2.0] {
+            for compact in [false, true] {
+                let p = theme.palette();
+                let fills = [p.normal, p.hovered, p.pressed, p.selected, theme.surface()];
+                let rect = |index| {
+                    Rect::from_min_size(
+                        pos2(12.0 + (index % 3) as f32 * 34.0, 12.0 + (index / 3) as f32 * 26.0),
+                        if compact { vec2(20.0, 12.0) } else { vec2(26.0, 18.0) },
+                    )
+                };
+                let borders = [Color32::RED, Color32::GREEN, Color32::BLUE, p.border, p.focus];
+                let before = static_capture(&mut renderer, theme, scale, |ui| {
+                    for index in 0..5 {
+                        let rect = rect(index).expand(if index % 2 == 0 { 0.0 } else { 0.5 });
+                        ui.painter().rect_filled(rect, 2.0, fills[index]);
+                        // A separate inset uses the weak fill, so omission of either fill is visible.
+                        ui.painter().rect_filled(rect.shrink(3.0), 0.0, fills[index]);
+                        ui.painter().rect_stroke(rect, 2.0, Stroke::new(1.0, borders[index]), StrokeKind::Inside);
+                        ui.painter()
+                            .line_segment([rect.left_center() + vec2(4.0, 0.0), rect.right_center() - vec2(4.0, 0.0)], Stroke::new(1.5, p.icon));
+                    }
+                });
+                let after = static_capture(&mut renderer, theme, scale, |ui| {
+                    let mut widgets = ui.visuals().widgets.clone();
+                    for (index, widget) in
+                        [&mut widgets.noninteractive, &mut widgets.inactive, &mut widgets.hovered, &mut widgets.active, &mut widgets.open]
+                            .into_iter()
+                            .enumerate()
+                    {
+                        widget.bg_stroke = Stroke::new(1.0, borders[index]);
+                        widget.expansion = if index % 2 == 0 { 0.0 } else { 0.5 };
+                    }
+                    WidgetPalette { noninteractive: p.normal, inactive: p.hovered, hovered: p.pressed, active: p.selected, open: theme.surface() }
+                        .apply_to(&mut widgets, CornerRadius::same(2), Stroke::new(1.5, p.icon));
+                    for (index, widget) in
+                        [widgets.noninteractive, widgets.inactive, widgets.hovered, widgets.active, widgets.open].iter().enumerate()
+                    {
+                        let rect = rect(index).expand(widget.expansion);
+                        ui.painter().rect_filled(rect, widget.corner_radius, widget.bg_fill);
+                        ui.painter().rect_filled(rect.shrink(3.0), 0.0, widget.weak_bg_fill);
+                        ui.painter().rect_stroke(rect, widget.corner_radius, widget.bg_stroke, StrokeKind::Inside);
+                        ui.painter().line_segment([rect.left_center() + vec2(4.0, 0.0), rect.right_center() - vec2(4.0, 0.0)], widget.fg_stroke);
+                    }
+                });
+                let name = format!("palette-{}-{scale}x-{}", theme.name(), if compact { "compact" } else { "normal" });
+                let changed = artifacts.record(&name, &before, &after, false);
+                assert_eq!(before.meshes, after.meshes, "{name}");
+                assert_eq!(changed, 0, "{name}");
+            }
+        }
+    }
+}
+
+#[test]
+fn svg_preparation_matches_literal_raster_references_at_all_scales() {
+    use craft_ui::icons::{SvgIconSet, SvgStyle};
+    use egui::{
+        ImageSource,
+        load::{Bytes, ImagePoll, SizeHint},
+    };
+
+    const SOURCE: &[u8] = br#"<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"><rect x="4" y="4" width="16" height="16"/><path d="M4 4L20 20"/></svg>"#;
+    const LIGHT: &[u8] = br##"<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="none" stroke="#0f172a" stroke-width="1.75"><rect x="4" y="4" width="16" height="16"/><path d="M4 4L20 20"/></svg>"##;
+    const DARK: &[u8] = br##"<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="none" stroke="#e2e8f0" stroke-width="1.75"><rect x="4" y="4" width="16" height="16"/><path d="M4 4L20 20"/></svg>"##;
+    fn raster(ctx: &Context, uri: &str, size: u32) -> Capture {
+        let ImagePoll::Ready { image } = ctx.try_load_image(uri, SizeHint::Size { width: size, height: size, maintain_aspect_ratio: true }).unwrap()
+        else {
+            panic!("compiled-in SVG must rasterize synchronously")
+        };
+        assert_eq!(image.size, [size as usize; 2]);
+        let image = RgbaImage::from_raw(size, size, image.pixels.iter().flat_map(|pixel| pixel.to_srgba_unmultiplied()).collect()).unwrap();
+        assert!(image.pixels().any(|pixel| pixel[3] != 0), "blank SVG is not a valid matching baseline");
+        Capture { image, meshes: None }
+    }
+    let mut artifacts = Artifacts::new("svg");
+    for (theme, color, literal) in [(Theme::Light, "#0f172a", LIGHT), (Theme::Dark, "#e2e8f0", DARK)] {
+        for (scale, numerator) in [(1.0, 2), (1.5, 3), (2.0, 4)] {
+            for logical_size in [12, 24] {
+                let ctx = Context::default();
+                egui_extras::install_image_loaders(&ctx);
+                ctx.include_bytes("bytes://literal-reference.svg", Bytes::Static(literal));
+                let icons =
+                    SvgIconSet::new(&[("box", SOURCE)], SvgStyle { current_color: color, stroke_width: Some("1.75") }, "bytes://actual/", "box");
+                let ImageSource::Bytes { uri, bytes } = icons.source("box") else { panic!("catalog must return embedded bytes") };
+                ctx.include_bytes(uri.clone(), bytes);
+                let size = logical_size * numerator / 2;
+                let before = raster(&ctx, "bytes://literal-reference.svg", size);
+                let after = raster(&ctx, &uri, size);
+                let name = format!("svg-{}-{scale}x-{logical_size}pt", theme.name());
+                assert_eq!(artifacts.record(&name, &before, &after, false), 0, "{name}");
+            }
+        }
+    }
+}
diff --git a/docs/ui-visual-regressions.md b/docs/ui-visual-regressions.md
new file mode 100644
index 0000000..74c2b3c
--- /dev/null
+++ b/docs/ui-visual-regressions.md
@@ -0,0 +1,51 @@
+# Shared UI visual regressions
+
+`crates/ui/tests/visual_regression.rs` runs actual shared components through egui and renders
+paired images with the same offscreen wgpu renderer. `visual/fixtures.rs` supplies independent
+reference painters with fixed geometry and state colors. References do not call the shared
+components or obtain expected rectangles from component responses. These fixtures specify the
+shared components' visual contracts; they are not historical screenshots of applications.
+
+## Coverage
+
+| Surface | Paired cases | Dimensions exercised |
+| --- | ---: | --- |
+| Icon buttons (separate and single-shape frames), tabs, horizontal and vertical split handles | 372 | Light/dark, 1/1.5/2 pixels per point, normal/compact, normal/hover/pressed/disabled/focused; buttons and tabs also selected/selected-pressed |
+| Toolbar fitting | 18 | Light/dark, three display scales, all groups visible / a group plus overflow / overflow only |
+| Widget palette | 12 | Light/dark, three display scales, normal/compact; all five widget states, both fills, radius, foreground and preserved border/expansion |
+| SVG preparation | 12 | Light/dark colors, three display scales, 12/24 point icons; literal recolor and stroke references |
+
+The 414 positive pairs require identical RGBA pixels. The 402 wgpu pairs also require identical
+tessellated vertices, indices, texture IDs and clip rectangles. SVG pairs compare the actual
+image loader's raster output against literal prepared SVGs. Every SVG must contain visible pixels.
+
+Controls receive real egui pointer movement, pointer press or focus requests; assertions verify
+that the intended response state was reached. Disabled controls receive pointer input and must
+remain inert. Selection takes precedence over a pointer press. Resize handles exercise a drag
+and both split orientations. Compact fixtures test the same visual contracts at smaller sizes.
+
+An additional 36 negative comparisons deliberately change normal fill color, inter-button
+spacing or stroke width. Each must differ in both pixels and meshes. No tolerance, mask, crop,
+perceptual score or automatic baseline update can turn a changed pixel into a passing result.
+Toolbar unit tests separately reject malformed and excessive input, require a reachable overflow
+control, and verify that accepted layouts preserve every group and fit the supplied width.
+
+## Running and reviewing
+
+```sh
+cargo test -p craft-ui --test visual_regression
+CRAFT_UI_VISUAL_DIR=/absolute/path/to/visuals cargo test -p craft-ui --test visual_regression
+```
+
+The optional directory receives one subdirectory per suite. Each case writes `-before.png`
+(the independent reference), `-after.png` (the production component) and `-difference.png`
+(changed pixels in magenta), plus a `comparison.tsv` with dimensions, changed pixel count,
+mesh equality and whether a change is expected. Completed rows survive a subsequent failed
+assertion. The fixture count and image dimensions are fixed and bounded; the largest control
+image is 256 by 144 pixels. Tests fail if a renderer cannot initialize or render.
+
+The test renderer compares both sides on the current machine. It does not assert cross-driver
+pixel identity or substitute for application-specific native screenshots, complete themes,
+text/font layout, command dispatch, window resizing, accessibility service acceptance, or
+cross-platform runtime tests. Application baselines must retain their own source and binary
+provenance. Review those captures separately when adopting or changing a shared adapter.