app icon: unicorn (owner's ArtCraft drawing), Dock/taskbar/launcher wiring, palette docs

- assets/app-icon/: master and light SVGs, 1024 px PNG, .icns (Apple grid), .ico (16-256),
  hicolor 16-512 + scalable, LICENSE.txt, README with palette (#e0368f / #efe9dc / #0b0b0c),
  tile geometry and provenance; attribution sidecars + ATTRIBUTION.md rows.
- packaging/icons.sh regenerates everything with resvg, iconutil and the new `cargo xtask ico`.
- Runtime icon via ViewportBuilder::with_icon (padded variant on macOS) and Wayland app ID
  ai.storyteller.effectcraft; packaging/linux/ai.storyteller.effectcraft.desktop.
- apps/effectcraft/build.rs embeds the .ico and VERSIONINFO into effectcraft.exe (winresource,
  Windows targets only; a missing resource compiler is a warning).
- Web favicon.svg is now the unicorn icon.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

packaging/icons.sh

@@ -0,0 +1,62 @@
+#!/usr/bin/env bash
+# Regenerate every app icon file from assets/app-icon/effectcraft.svg (the canonical vector).
+#
+# Needs: resvg (brew install resvg / cargo install resvg). On macOS, iconutil also writes the
+# .icns. The outputs are committed, so builds and packaging never need these tools.
+#
+#   packaging/icons.sh
+#
+# effectcraft.svg and effectcraft-small.svg (the lighter 1024 px trace) come from craftrules
+# (assets/app-icons/effectcraft/, which also keeps the source drawing) and are copied in by hand.
+set -euo pipefail
+ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
+DIR="$ROOT/assets/app-icon"
+SVG="$DIR/effectcraft.svg"
+ID="ai.storyteller.effectcraft"
+TMP="$(mktemp -d)"
+trap 'rm -rf "$TMP"' EXIT
+
+command -v resvg >/dev/null || { echo "error: resvg not found (brew install resvg)" >&2; exit 1; }
+
+render() { resvg -w "$2" -h "$2" "$1" "$3" </dev/null; }
+
+# The tile fills its 512 viewBox edge to edge, which suits Windows and Linux. macOS icons keep
+# Apple's grid instead: an 824 px body centred on a 1024 canvas with a transparent margin.
+MAC="$TMP/mac.svg"
+sed -e 's|<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512">|<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1024 1024"><g transform="translate(100 100) scale(1.609375)">|' \
+  -e 's|</svg>[[:space:]]*$|</g></svg>|' "$SVG" >"$MAC"
+grep -q 'viewBox="0 0 1024 1024"' "$MAC" || { echo "error: unexpected <svg> header in $SVG" >&2; exit 1; }
+
+render "$SVG" 1024 "$DIR/effectcraft-1024.png"
+# Runtime window/Dock icon on macOS (apps/effectcraft/src/main.rs embeds it).
+render "$MAC" 512 "$DIR/effectcraft-macos-512.png"
+
+# Linux hicolor theme (the 256 px one is also the runtime icon on Windows and Linux).
+for s in 16 24 32 48 64 128 256 512; do
+  mkdir -p "$DIR/hicolor/${s}x${s}/apps"
+  render "$SVG" "$s" "$DIR/hicolor/${s}x${s}/apps/$ID.png"
+done
+mkdir -p "$DIR/hicolor/scalable/apps"
+cp "$DIR/effectcraft-small.svg" "$DIR/hicolor/scalable/apps/$ID.svg"
+
+# Windows .ico.
+ICO_PNGS=()
+for s in 16 20 24 32 40 48 64 128 256; do
+  render "$SVG" "$s" "$TMP/ico-$s.png"
+  ICO_PNGS+=("$TMP/ico-$s.png")
+done
+(cd "$ROOT" && cargo run -q -p xtask -- ico "$DIR/effectcraft.ico" "${ICO_PNGS[@]}")
+
+# macOS .icns.
+if command -v iconutil >/dev/null; then
+  SET="$TMP/effectcraft.iconset"
+  mkdir -p "$SET"
+  for s in 16 32 128 256 512; do
+    render "$MAC" "$s" "$SET/icon_${s}x${s}.png"
+    render "$MAC" $((s * 2)) "$SET/icon_${s}x${s}@2x.png"
+  done
+  iconutil -c icns -o "$DIR/effectcraft.icns" "$SET"
+else
+  echo "warning: iconutil not found (macOS only); effectcraft.icns not regenerated" >&2
+fi
+echo "icons written to $DIR"

packaging/linux/ai.storyteller.effectcraft.desktop

@@ -0,0 +1,13 @@
+[Desktop Entry]
+Type=Application
+Name=EffectCraft
+GenericName=Motion Graphics Editor
+Comment=Motion graphics and visual effects compositor
+Exec=effectcraft %F
+TryExec=effectcraft
+Icon=ai.storyteller.effectcraft
+Terminal=false
+StartupNotify=true
+StartupWMClass=ai.storyteller.effectcraft
+Categories=AudioVideo;Video;Graphics;2DGraphics;
+Keywords=motion;graphics;animation;compositor;effects;keyframe;vfx;