app icon: calico cat in a polka-dot scarf (owner's ArtCraft drawing), Dock/taskbar/launcher wiring, palette docs

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

assets/app-icon/LICENSE.txt

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+DesignCraft app icon (designcraft.svg, designcraft-small.svg and every file derived from them in
+this directory: designcraft-1024.png, designcraft-macos-512.png, designcraft.icns, designcraft.ico,
+hicolor/).
+
+Original artwork made for this project by the project owner in ArtCraft, then vectorised. No
+third-party material. Licensed like the rest of DesignCraft, under either of
+
+  * Apache License, Version 2.0 (https://www.apache.org/licenses/LICENSE-2.0)
+  * MIT license (https://opensource.org/licenses/MIT)
+
+at your option.
+
+Regenerate the derived files with packaging/icons.sh.

assets/app-icon/README.md

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+# DesignCraft app icon
+
+**A calico cat wearing a polka-dot scarf**, as an engraving-style head-and-shoulders portrait in the
+Crafting Apps' owl-template framing: a full-bleed colour field, the cat in three-quarter view, its
+shoulders running off the bottom edge.
+
+## Palette
+
+Exactly three colours:
+
+| Colour | Hex | Used for |
+|---|---|---|
+| Ink | `#0b0b0c` | Line work and contour |
+| Paper | `#efe9dc` | The figure (the cat and its scarf) |
+| DesignCraft green (app colour) | `#7bb51c` | The full-bleed background field |
+
+## Geometry
+
+A 512 × 512 viewBox, clipped to a rounded square with `rx=112`. Windows and Linux use the full tile. The
+macOS icons (`.icns`, `designcraft-macos-512.png`) sit on Apple's grid: an 824/1024 body with a
+transparent margin.
+
+## Provenance
+
+The owner drew the cat in ArtCraft. The 2880 px drawing, keyed to the three-colour palette, lives
+outside this repo in craftrules at `assets/app-icons/designcraft/source.png`. It was vectorised with
+craftrules' `assets/logo-options/_tools/vectorize_tile.py`: `designcraft.svg` is traced at 2048 px and
+`designcraft-small.svg` at 1024 px. Design rules: craftrules `standards/icon-design.md`.
+
+## Files
+
+| File | Use |
+|---|---|
+| `designcraft.svg` | Canonical artwork (about 680 KB) |
+| `designcraft-small.svg` | Lighter vector (about 350 KB); also `hicolor/scalable` |
+| `designcraft-1024.png` | 1024 px render of the full tile |
+| `designcraft-macos-512.png` | Runtime Dock icon on macOS (embedded by `apps/designcraft`) |
+| `designcraft.icns` | macOS bundle icon (`CFBundleIconFile`) |
+| `designcraft.ico` | Windows exe icon, 16–256 px (embedded by `apps/designcraft/build.rs`) |
+| `hicolor/<size>/apps/ai.storyteller.designcraft.png` | Linux icon theme, 16–512 px; the 256 px one is also the runtime window icon on Windows and Linux |
+| `hicolor/scalable/apps/ai.storyteller.designcraft.svg` | Linux scalable icon |
+| `LICENSE.txt` | MIT OR Apache-2.0 |
+
+The app ID is `ai.storyteller.designcraft`. It's used for the hicolor icon names, the Wayland app ID and
+`packaging/linux/ai.storyteller.designcraft.desktop`.
+
+## Regenerate
+
+Edit `designcraft.svg` (or `designcraft-small.svg`), then run `packaging/icons.sh`. It needs `resvg`, and
+`iconutil` for the `.icns` (macOS only). It packs the `.ico` with `cargo xtask ico`.