Add TypeScript declarations for image assets

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

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: backnotprop

packages/ui/types/assets.d.ts

@@ -0,0 +1,19 @@
+declare module '*.webp' {
+  const src: string;
+  export default src;
+}
+
+declare module '*.png' {
+  const src: string;
+  export default src;
+}
+
+declare module '*.jpg' {
+  const src: string;
+  export default src;
+}
+
+declare module '*.svg' {
+  const src: string;
+  export default src;
+}