feat: Added DebugModeToggle component and StatusFilter pill bar to Admi…

- "frontend/src/pages/AdminPipeline.tsx"
- "frontend/src/api/public-client.ts"
- "frontend/src/App.css"

GSD-Task: S04/T01

frontend/src/App.css

@@ -541,6 +541,57 @@ a.app-footer__repo:hover {
   cursor: not-allowed;
 }
 
+/* ── Debug Mode Toggle ────────────────────────────────────────────────────── */
+
+.debug-toggle {
+  display: flex;
+  align-items: center;
+  gap: 0.5rem;
+  font-size: 0.8125rem;
+}
+
+.debug-toggle__label {
+  color: var(--color-text-on-header-label);
+  white-space: nowrap;
+}
+
+.debug-toggle__switch {
+  position: relative;
+  width: 2.5rem;
+  height: 1.25rem;
+  background: var(--color-toggle-track);
+  border: none;
+  border-radius: 9999px;
+  cursor: pointer;
+  transition: background 0.2s;
+  flex-shrink: 0;
+}
+
+.debug-toggle__switch--active {
+  background: var(--color-toggle-review);
+}
+
+.debug-toggle__switch::after {
+  content: "";
+  position: absolute;
+  top: 0.125rem;
+  left: 0.125rem;
+  width: 1rem;
+  height: 1rem;
+  background: var(--color-toggle-thumb);
+  border-radius: 50%;
+  transition: transform 0.2s;
+}
+
+.debug-toggle__switch--active::after {
+  transform: translateX(1.25rem);
+}
+
+.debug-toggle__switch:disabled {
+  opacity: 0.5;
+  cursor: not-allowed;
+}
+
 /* ── Pagination ───────────────────────────────────────────────────────────── */
 
 .pagination {

frontend/src/api/public-client.ts

@@ -471,3 +471,20 @@ export async function revokePipeline(videoId: string): Promise<RevokeResponse> {
     method: "POST",
   });
 }
+
+// ── Debug Mode ──────────────────────────────────────────────────────────────
+
+export interface DebugModeResponse {
+  debug_mode: boolean;
+}
+
+export async function fetchDebugMode(): Promise<DebugModeResponse> {
+  return request<DebugModeResponse>(`${BASE}/admin/pipeline/debug-mode`);
+}
+
+export async function setDebugMode(enabled: boolean): Promise<DebugModeResponse> {
+  return request<DebugModeResponse>(`${BASE}/admin/pipeline/debug-mode`, {
+    method: "PUT",
+    body: JSON.stringify({ debug_mode: enabled }),
+  });
+}

frontend/src/pages/AdminPipeline.tsx

@@ -8,6 +8,8 @@ import {
   fetchPipelineVideos,
   fetchPipelineEvents,
   fetchWorkerStatus,
+  fetchDebugMode,
+  setDebugMode,
   triggerPipeline,
   revokePipeline,
   type PipelineVideoItem,
@@ -364,6 +366,93 @@ function WorkerStatus() {
   );
 }
 
+// ── Debug Mode Toggle ────────────────────────────────────────────────────────
+
+function DebugModeToggle() {
+  const [debugMode, setDebugModeState] = useState<boolean | null>(null);
+  const [debugLoading, setDebugLoading] = useState(false);
+
+  useEffect(() => {
+    let cancelled = false;
+    fetchDebugMode()
+      .then((res) => {
+        if (!cancelled) setDebugModeState(res.debug_mode);
+      })
+      .catch(() => {
+        // silently fail — toggle stays hidden
+      });
+    return () => { cancelled = true; };
+  }, []);
+
+  async function handleToggle() {
+    if (debugMode === null || debugLoading) return;
+    setDebugLoading(true);
+    try {
+      const res = await setDebugMode(!debugMode);
+      setDebugModeState(res.debug_mode);
+    } catch {
+      // swallow — leave previous state
+    } finally {
+      setDebugLoading(false);
+    }
+  }
+
+  if (debugMode === null) return null;
+
+  return (
+    <div className="debug-toggle">
+      <span className="debug-toggle__label">
+        Debug {debugMode ? "On" : "Off"}
+      </span>
+      <button
+        type="button"
+        className={`debug-toggle__switch ${debugMode ? "debug-toggle__switch--active" : ""}`}
+        onClick={handleToggle}
+        disabled={debugLoading}
+        aria-label={`Turn debug mode ${debugMode ? "off" : "on"}`}
+      />
+    </div>
+  );
+}
+
+// ── Status Filter ────────────────────────────────────────────────────────────
+
+function StatusFilter({
+  videos,
+  activeFilter,
+  onFilterChange,
+}: {
+  videos: PipelineVideoItem[];
+  activeFilter: string | null;
+  onFilterChange: (filter: string | null) => void;
+}) {
+  const statuses = Array.from(new Set(videos.map((v) => v.processing_status))).sort();
+
+  if (statuses.length <= 1) return null;
+
+  return (
+    <div className="filter-tabs">
+      <button
+        type="button"
+        className={`filter-tab ${activeFilter === null ? "filter-tab--active" : ""}`}
+        onClick={() => onFilterChange(null)}
+      >
+        All
+      </button>
+      {statuses.map((status) => (
+        <button
+          key={status}
+          type="button"
+          className={`filter-tab ${activeFilter === status ? "filter-tab--active" : ""}`}
+          onClick={() => onFilterChange(status)}
+        >
+          {status} ({videos.filter((v) => v.processing_status === status).length})
+        </button>
+      ))}
+    </div>
+  );
+}
+
 // ── Main Page ────────────────────────────────────────────────────────────────
 
 export default function AdminPipeline() {
@@ -373,6 +462,7 @@ export default function AdminPipeline() {
   const [expandedId, setExpandedId] = useState<string | null>(null);
   const [actionLoading, setActionLoading] = useState<string | null>(null);
   const [actionMessage, setActionMessage] = useState<{ id: string; text: string; ok: boolean } | null>(null);
+  const [activeFilter, setActiveFilter] = useState<string | null>(null);
 
   const load = useCallback(async () => {
     setLoading(true);
@@ -448,6 +538,7 @@ export default function AdminPipeline() {
           </p>
         </div>
         <div className="admin-pipeline__header-right">
+          <DebugModeToggle />
           <WorkerStatus />
           <button className="btn btn--secondary" onClick={() => void load()} disabled={loading}>
             ↻ Refresh
@@ -462,8 +553,16 @@ export default function AdminPipeline() {
       ) : videos.length === 0 ? (
         <div className="empty-state">No videos in pipeline.</div>
       ) : (
-        <div className="admin-pipeline__list">
-          {videos.map((video) => (
+        <>
+          <StatusFilter
+            videos={videos}
+            activeFilter={activeFilter}
+            onFilterChange={setActiveFilter}
+          />
+          <div className="admin-pipeline__list">
+            {videos
+              .filter((v) => activeFilter === null || v.processing_status === activeFilter)
+              .map((video) => (
             <div key={video.id} className="pipeline-video">
               <div
                 className="pipeline-video__header"
@@ -530,6 +629,7 @@ export default function AdminPipeline() {
             </div>
           ))}
         </div>
+        </>
       )}
     </div>
   );