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>

app/DockTilePlugin/Info.plist

@@ -5,7 +5,7 @@
     <key>CFBundleIdentifier</key>
     <string>samsung.galaxy.GalaxyDockTilePlugin</string>
     <key>CFBundleExecutable</key>
-    <string>WarpDockTilePlugin</string>
+    <string>GalaxyDockTilePlugin</string>
     <key>CFBundleName</key>
     <string>GalaxyDockTilePlugin</string>
     <key>CFBundlePackageType</key>
@@ -15,7 +15,7 @@
     <key>CFBundleVersion</key>
     <string>1</string>
     <key>NSPrincipalClass</key>
-    <string>WarpDockTilePlugin</string>
+    <string>GalaxyDockTilePlugIn</string>
     <key>CFBundleInfoDictionaryVersion</key>
     <string>6.0</string>
 </dict>