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>

lib/screens/briefing/briefing_screen.dart

@@ -9,6 +9,7 @@ import '../../providers/briefing_provider.dart';
 import '../../providers/api_client_provider.dart';
 import '../../widgets/chat_message_bubble.dart';
 import '../../widgets/weather_card.dart';
+import '../../widgets/news_card.dart';
 import 'briefing_history_screen.dart';
 
 class BriefingScreen extends ConsumerStatefulWidget {
@@ -322,55 +323,27 @@ class _BriefingMessageItem extends StatelessWidget {
     final bool hasWeatherKey = isAssistant && meta != null && meta.containsKey('weather');
     final weatherData = hasWeatherKey ? meta['weather'] as Map<String, dynamic>? : null;
 
-    // RSS reactions
-    final rssItemIds = isAssistant && meta != null
-        ? (meta['rss_item_ids'] as List<dynamic>?)?.cast<int>() ?? []
-        : <int>[];
-
-    final scheme = Theme.of(context).colorScheme;
+    // RSS news cards
+    final rssItemsRaw = isAssistant && meta != null
+        ? (meta['rss_items'] as List<dynamic>?)?.cast<Map<String, dynamic>>() ?? []
+        : <Map<String, dynamic>>[];
+    final rssItems = rssItemsRaw.map(RssItemMeta.fromJson).toList();
 
     return Column(
       crossAxisAlignment: CrossAxisAlignment.stretch,
       children: [
         if (hasWeatherKey) WeatherCard(weather: weatherData),
         ChatMessageBubble(message: message),
-        if (rssItemIds.isNotEmpty)
+        if (rssItems.isNotEmpty)
           Padding(
-            padding: const EdgeInsets.only(left: 8, bottom: 4),
+            padding: const EdgeInsets.fromLTRB(4, 4, 4, 4),
             child: Column(
-              crossAxisAlignment: CrossAxisAlignment.start,
-              children: rssItemIds.asMap().entries.map((entry) {
-                final index = entry.key;
-                final itemId = entry.value;
-                final current = reactions[itemId];
-                return Padding(
-                  padding: const EdgeInsets.only(top: 4),
-                  child: Row(
-                    mainAxisSize: MainAxisSize.min,
-                    children: [
-                      Text(
-                        'Story ${index + 1}',
-                        style: TextStyle(
-                          fontSize: 12,
-                          color: scheme.onSurfaceVariant,
-                        ),
-                      ),
-                      const SizedBox(width: 8),
-                      _ReactionButton(
-                        emoji: '👍',
-                        active: current == 'up',
-                        onTap: () => onReaction(itemId, 'up'),
-                      ),
-                      const SizedBox(width: 4),
-                      _ReactionButton(
-                        emoji: '👎',
-                        active: current == 'down',
-                        onTap: () => onReaction(itemId, 'down'),
-                      ),
-                    ],
-                  ),
-                );
-              }).toList(),
+              crossAxisAlignment: CrossAxisAlignment.stretch,
+              children: rssItems.map((item) => NewsCard(
+                item: item,
+                reaction: reactions[item.id],
+                onReaction: onReaction,
+              )).toList(),
             ),
           ),
       ],
@@ -378,39 +351,6 @@ class _BriefingMessageItem extends StatelessWidget {
   }
 }
 
-class _ReactionButton extends StatelessWidget {
-  final String emoji;
-  final bool active;
-  final VoidCallback onTap;
-
-  const _ReactionButton({
-    required this.emoji,
-    required this.active,
-    required this.onTap,
-  });
-
-  @override
-  Widget build(BuildContext context) {
-    final scheme = Theme.of(context).colorScheme;
-    return GestureDetector(
-      onTap: onTap,
-      child: AnimatedContainer(
-        duration: const Duration(milliseconds: 150),
-        padding: const EdgeInsets.symmetric(horizontal: 8, vertical: 3),
-        decoration: BoxDecoration(
-          color: active
-              ? scheme.primary.withValues(alpha: 0.12)
-              : Colors.transparent,
-          border: Border.all(
-            color: active ? scheme.primary : scheme.outlineVariant,
-          ),
-          borderRadius: BorderRadius.circular(6),
-        ),
-        child: Text(emoji, style: const TextStyle(fontSize: 14)),
-      ),
-    );
-  }
-}
 
 class _GradientSendButton extends StatelessWidget {
   final VoidCallback? onPressed;