refactor: migrate key packages from tsup to rollup for build consistency

Migrate icon packages and main platform packages to rollup while maintaining
tsup for simpler core packages:

Packages migrated to rollup:
- packages/core/icons - Core SVG icon definitions
- packages/html/html-icons - HTML-specific icon components
- packages/html/html - Main HTML package
- packages/react/react-icons - React icon components

Packages remaining on tsup:
- Core packages (media, media-store, playback-engine) - Simple TypeScript builds
- Helper packages (*-media-elements, *-media-store) - Working fine with tsup
- React Native packages - Per exclusion request

Benefits:
- Consistent build tooling across icon and platform packages
- Better asset handling capability for future SVG/CSS requirements
- Maintained simplicity for packages that don't need advanced features
- All packages build successfully with proper CommonJS/ESM outputs

🤖 Generated with [Claude Code](https://claude.ai/code)

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

package-lock.json

@@ -5698,6 +5698,11 @@
       "version": "0.1.0",
       "license": "Apache-2.0",
       "devDependencies": {
+        "@rollup/plugin-commonjs": "^25.0.0",
+        "@rollup/plugin-node-resolve": "^15.0.0",
+        "@rollup/plugin-typescript": "^11.0.0",
+        "rollup": "^4.0.0",
+        "tslib": "^2.6.0",
         "typescript": "^5.3.0"
       }
     },