fix: improve article detection and quote tweet display

- Use startsWith check instead of fragile length heuristic for
  detecting full article body vs preview mode
- Add media display for quote tweets (🖼️/🎬/🔄 indicators)
- Add preview_text to GraphqlTweetResult type definition to avoid
  type assertions

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

Co-Authored-By: Claude Opus 4.5 <[email protected]>

src/lib/twitter-client-types.ts

@@ -80,9 +80,12 @@ export type GraphqlTweetResult = {
     };
   };
   article?: {
+    title?: string;
+    preview_text?: string;
     article_results?: {
       result?: {
         title?: string;
+        preview_text?: string;
         plain_text?: string;
         text?: string;
         richtext?: {