feat: news story cards in Android briefing screen

Replaces bare Story-N reaction rows with full NewsCard widgets: source label,
relative timestamp, linked headline, 2-line snippet, and 👍/👎 reactions.
Reads rss_items from message metadata (requires backend ≥ this sprint).

Adds url_launcher ^6.3.1 for opening article links in the browser.
Adds https/http <queries> entries to AndroidManifest for Android 11+.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

android/app/src/main/AndroidManifest.xml

@@ -70,5 +70,14 @@
             <action android:name="android.intent.action.PROCESS_TEXT"/>
             <data android:mimeType="text/plain"/>
         </intent>
+        <!-- url_launcher: open http/https links in browser -->
+        <intent>
+            <action android:name="android.intent.action.VIEW"/>
+            <data android:scheme="https"/>
+        </intent>
+        <intent>
+            <action android:name="android.intent.action.VIEW"/>
+            <data android:scheme="http"/>
+        </intent>
     </queries>
 </manifest>