fix: address open triage issues (#21,#26,#45,#46,#47,#30-33)

- #45: re-read local folder when recursive checkbox toggles
- #47: clear Identify crop spinner when image is already cached
- #46: search selected people by person_ids; AND for "First Last"
- #21: enqueue network import without blocking API walk
- #26: serve resized grid thumbnails for photos
- #30/#31/#33: re-enable small-face filters in auto-match

viewer-frontend/app/api/photos/[id]/image/route.ts

@@ -260,6 +260,38 @@ export async function GET(
         },
       });
 
+    // Grid thumbnails: resize photos (videos handled above) — #26
+    if (thumbnail && sharp) {
+      try {
+        let pipeline = sharp(imageBuffer).rotate().resize({
+          width: 480,
+          height: 480,
+          fit: 'inside',
+          withoutEnlargement: true,
+        });
+        if (watermark) {
+          const metadata = await pipeline.metadata();
+          const baseWidth = metadata.width ?? 480;
+          const baseHeight = metadata.height ?? 480;
+          const overlayBuffer = await getWatermarkOverlay(baseWidth, baseHeight);
+          pipeline = sharp(imageBuffer)
+            .rotate()
+            .resize({ width: 480, height: 480, fit: 'inside', withoutEnlargement: true })
+            .composite([{ input: overlayBuffer, gravity: 'center', blend: 'hard-light' }]);
+        }
+        const result = await pipeline.jpeg({ quality: 75 }).toBuffer();
+        return new NextResponse(result as unknown as BodyInit, {
+          headers: {
+            'Content-Type': 'image/jpeg',
+            'Cache-Control': 'public, max-age=86400',
+          },
+        });
+      } catch (error) {
+        console.error('Error generating image thumbnail:', error);
+        // fall through to original / watermarked full image
+      }
+    }
+
     if (!watermark) {
       return createOriginalResponse();
     }