fix(media-store): resolve TypeScript declaration generation build issues

- Switch from pure tsup to hybrid tsup + tsc approach for declaration generation
- Update build script to use 'tsup && tsc --emitDeclarationOnly'
- Disable tsup's DTS generation to avoid conflicts with TypeScript composite projects
- Ensure all component state definitions have proper .d.ts files generated
- Fix build pipeline that was requiring manual dist file modifications

This resolves the fundamental build system issue where TypeScript declarations
weren't being properly generated, eliminating the need for manual dist file edits.

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

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

packages/core/media-store/package.json

@@ -16,7 +16,7 @@
     "dist"
   ],
   "scripts": {
-    "build": "tsup",
+    "build": "tsup && tsc --emitDeclarationOnly",
     "test": "echo \"No tests yet\"",
     "clean": "rm -rf dist"
   },

packages/core/media-store/tsup.config.ts

@@ -11,11 +11,6 @@ export default defineConfig({
     /^@vjs-10\//,
     /^[^.]/,
   ],
-  // Generate TypeScript declarations with custom config
-  dts: {
-    compilerOptions: {
-      composite: false,
-      incremental: false,
-    },
-  },
+  // Disable tsup's dts generation - we'll use tsc directly
+  dts: false,
 });