Revert "Fix RSS time filters and add draggable grid layout"

This reverts commit 4ee365cfc0.

lib/db.ts

@@ -80,23 +80,5 @@ export async function getDb() {
     );
   }
 
-  // Migrate existing non-ISO pub_date values to ISO 8601
-  try {
-    const rows = await db.all(
-      "SELECT id, pub_date FROM rss_items WHERE pub_date IS NOT NULL AND pub_date NOT LIKE '____-__-__T%'"
-    );
-    for (const row of rows) {
-      const d = new Date(row.pub_date);
-      if (!isNaN(d.getTime())) {
-        await db.run('UPDATE rss_items SET pub_date = ? WHERE id = ?', d.toISOString(), row.id);
-      }
-    }
-    if (rows.length > 0) {
-      console.log(`Migrated ${rows.length} rss_items pub_date values to ISO 8601`);
-    }
-  } catch (e) {
-    // Table may not have data yet, ignore
-  }
-
   return db;
 }