v1.2.0: Fix app icons and DockTilePlugin rename

- Rename WarpDockTilePlugin to GalaxyDockTilePlugin
- Fix runtime icon switching to load from compiled-in assets
- Add NSDockTilePlugIn key to embedded Info.plist
- Replace all channel icons with padded Galaxy variants
- Update build.rs references for renamed plugin
- No longer requires post-bundle steps for icon switching
- Bump version to 1.2.0

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Cargo.lock

@@ -5191,7 +5191,7 @@ dependencies = [
 
 [[package]]
 name = "galaxy"
-version = "1.0.0"
+version = "1.1.0"
 dependencies = [
  "addr",
  "aho-corasick",