Add time filter pills to RSS feed widget

Adds since query param (1h/24h/7d/30d) to the RSS API route and
a matching TimeFilterPills row in the NewsFeed UI so users can
narrow the feed to recent items.

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

app/api/rss/route.ts

@@ -8,6 +8,7 @@ export async function GET(req: NextRequest) {
     const q = searchParams.get('q');
     const feedId = searchParams.get('feed_id');
     const bookmarked = searchParams.get('bookmarked');
+    const since = searchParams.get('since');
     const limit = parseInt(searchParams.get('limit') || '50', 10);
     const offset = parseInt(searchParams.get('offset') || '0', 10);
 
@@ -27,6 +28,19 @@ export async function GET(req: NextRequest) {
     if (bookmarked === '1') {
         conditions.push('i.bookmarked = 1');
     }
+    if (since) {
+        const sinceMap: Record<string, string> = {
+            '1h': '-1 hours',
+            '24h': '-24 hours',
+            '7d': '-7 days',
+            '30d': '-30 days',
+        };
+        const modifier = sinceMap[since];
+        if (modifier) {
+            conditions.push("i.pub_date >= datetime('now', ?)");
+            params.push(modifier);
+        }
+    }
 
     const where = conditions.length > 0 ? `WHERE ${conditions.join(' AND ')}` : '';