feat: add full-text search bar to sidebar (FTS5)

frontend/src/routes/YoutubeDashboard.svelte

@@ -21,6 +21,8 @@
   let allChannels = $state([]);
   let editingCategories = $state(false);
   let prevSelectedId = $state(null);
+  let searchQuery = $state('');
+  let searchTimeout = null;
 
   // Agent queue state
   let agentItems = $state([]);
@@ -74,6 +76,13 @@
         if (channelFilter && !channelFilter.startsWith('📁')) {
           params.set('channel', channelFilter);
         }
+        if (searchQuery.trim()) {
+          params.set('search', searchQuery.trim());
+        }
+        if (searchQuery.trim()) {
+          params.delete('status');
+          params.set('limit', '50');
+        }
         const res = await fetch(`/api/videos?${params}`);
         if (res.ok) {
           videos = await res.json();
@@ -478,6 +487,25 @@
           {/if}
         </div>
       {:else}
+        <!-- Search bar -->
+        <div class="px-2 py-1.5" style="border-bottom:1px solid var(--border)">
+          <div class="flex items-center space-x-1" style="background:var(--bg-tertiary);border:1px solid var(--border);border-radius:6px;padding:2px 8px">
+            <span style="color:var(--text-muted);font-size:12px">🔍</span>
+            <input type="text" bind:value={searchQuery}
+              placeholder="Search videos..."
+              class="w-full text-[11px] py-1 bg-transparent outline-none"
+              style="color:var(--text-primary)"
+              oninput={() => {
+                clearTimeout(searchTimeout);
+                searchTimeout = setTimeout(loadVideos, 300);
+              }}
+              onkeydown={(e) => { if (e.key === 'Enter') { clearTimeout(searchTimeout); loadVideos(); } }} />
+            {#if searchQuery}
+              <button onclick={() => { searchQuery = ''; loadVideos(); }}
+                class="text-[10px] px-1" style="color:var(--text-muted)">✕</button>
+            {/if}
+          </div>
+        </div>
         <!-- Channel filter bar -->
         {#if (allChannels.length || channels.length) > 1}
           <div class="px-2 py-1.5 space-y-1" style="border-bottom:1px solid var(--border)">