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

- assets/app-icon/: lightcraft.svg (master), lightcraft-small.svg, 1024 PNG, macOS 512 PNG,
  .icns, .ico, hicolor theme (ai.storyteller.lightcraft), LICENSE.txt, README (palette,
  geometry, provenance, files)
- packaging/icons.sh regenerates everything (resvg, iconutil, new `cargo xtask ico`)
- apps/lightcraft: runtime window/Dock icon + Wayland app id; build.rs embeds the .ico and
  VERSIONINFO into lightcraft.exe (winresource, Windows targets only)
- packaging/linux/ai.storyteller.lightcraft.desktop
- ATTRIBUTION.md entry; icon at the top of README

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

packaging/linux/ai.storyteller.lightcraft.desktop

@@ -0,0 +1,12 @@
+[Desktop Entry]
+Type=Application
+Name=LightCraft
+GenericName=Photo Library and Raw Developer
+Comment=Organise photos and develop raw files, non-destructively
+Exec=lightcraft %F
+Icon=ai.storyteller.lightcraft
+Terminal=false
+Categories=Graphics;2DGraphics;RasterGraphics;Photography;
+Keywords=photo;raw;camera;library;develop;
+StartupWMClass=ai.storyteller.lightcraft
+MimeType=image/jpeg;image/png;image/tiff;image/webp;image/x-adobe-dng;image/x-sony-arw;image/x-canon-cr2;image/x-canon-cr3;image/x-nikon-nef;image/x-fuji-raf;image/x-olympus-orf;image/x-panasonic-rw2;image/x-pentax-pef;