feat(hobbs-organizer): v1.3.0 photo gallery + Shield photo app 1.1, slideshow 15s

- /photo/gallery: D-pad grid, OK opens full screen, arrows browse, Back returns
- 400px gallery tiles cached per photo (sync + uploads)
- com.dayline.photos 1.1: launcher tile opens the gallery, takes remote input,
  Back steps through WebView history; screensaver unchanged
- slideshow interval 20s -> 15s (live settings)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01E9NnVEico3WvFxLyjy1iW3

tv app/Hobbs-Family-Organizer-Self-Hosted-v1.0.0/app/admin/page.tsx

@@ -381,7 +381,7 @@ function ago(timestamp: number | null) {
   return hours < 48 ? `${hours} h ago` : `${Math.round(hours / 24)} days ago`;
 }
 
-/** Resize in the browser to a 1920px JPEG and a 64px thumbnail, so the server needs no image library. */
+/** Resize in the browser to a 1920px JPEG, a 400px gallery tile and a 64px thumbnail, so the server needs no image library. */
 async function resizeForUpload(file: File) {
   const bitmap = await createImageBitmap(file);
   const encode = async (edge: number, quality: number) => {
@@ -395,9 +395,10 @@ async function resizeForUpload(file: File) {
     return { blob, width: canvas.width, height: canvas.height };
   };
   const photo = await encode(1920, 0.88);
+  const tile = await encode(400, 0.82);
   const thumb = await encode(64, 0.7);
   bitmap.close();
-  return { photo, thumb };
+  return { photo, tile, thumb };
 }
 
 function PhotosTab() {
@@ -500,10 +501,11 @@ function PhotosTab() {
     for (const file of Array.from(files)) {
       setUploading(`Uploading ${done + failed + 1} of ${files.length}…`);
       try {
-        const { photo, thumb } = await resizeForUpload(file);
+        const { photo, tile, thumb } = await resizeForUpload(file);
         const form = new FormData();
         form.append("photo", photo.blob, "photo.jpg");
         form.append("thumb", thumb.blob, "thumb.jpg");
+        form.append("tile", tile.blob, "tile.jpg");
         form.append("width", String(photo.width));
         form.append("height", String(photo.height));
         form.append("takenAt", String(file.lastModified || ""));