feat: filter sidebar, ingest progress, starred photos

- Left filter sidebar: All Photos / Favorites / Date by Year / Tags / Collections
  with counts, See more/less toggles, and blue active-row highlight
- SSE ingest badge in header: pulsing dot + filename + indexed count during scan;
  auto-refreshes the library when a scan finishes
- Starred/Favorites: starred column on photos, star button in lightbox toolbar,
  Favorites row in sidebar, ?starred=1 filter on /api/photos
- GET /api/library/stats endpoint (totals, years, tags, collections)
- GET /api/ingest/stream SSE endpoint (polls ingest_status table every 1.5s)
- Worker writes ingest_status (active, current file, scanned count) to SQLite

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

client/src/components/IngestBadge.jsx

@@ -0,0 +1,53 @@
+import { useState, useEffect, useRef } from 'react';
+
+export default function IngestBadge({ onScanComplete }) {
+  const [status, setStatus] = useState(null);
+  const wasActive = useRef(false);
+
+  useEffect(() => {
+    const es = new EventSource('/api/ingest/stream');
+
+    es.onmessage = (e) => {
+      const data = JSON.parse(e.data);
+      setStatus(data);
+      if (wasActive.current && !data.active) {
+        onScanComplete?.();
+      }
+      wasActive.current = !!data.active;
+    };
+
+    es.onerror = () => {
+      // Reconnect is handled automatically by EventSource
+    };
+
+    return () => es.close();
+  }, []);
+
+  if (!status?.active) return null;
+
+  return (
+    <div style={{
+      display: 'flex', alignItems: 'center', gap: 7,
+      fontSize: 12, color: '#888',
+      overflow: 'hidden', maxWidth: 340,
+    }}>
+      <span style={{
+        width: 7, height: 7, borderRadius: '50%',
+        background: '#4d9eff', flexShrink: 0,
+        animation: 'pulse-dot 1.4s ease-in-out infinite',
+      }} />
+      <span style={{ whiteSpace: 'nowrap', color: '#aaa' }}>
+        Scanning · {status.scanned.toLocaleString()} indexed
+      </span>
+      {status.current && (
+        <span style={{
+          color: '#444', overflow: 'hidden',
+          textOverflow: 'ellipsis', whiteSpace: 'nowrap',
+          fontSize: 11,
+        }}>
+          {status.current}
+        </span>
+      )}
+    </div>
+  );
+}