Steam library: safe removal and title matching, artwork within Steam's limit

- Remove: collections and artwork clearing are best effort in Steam's JS, and
  the host carries on to delete the files when Steam isn't running (Android
  apps and devkit titles).
- Devkit titles: the shortcut is found by devkit id, the saved id, or an
  executable/start folder inside the title's folder; never by display name.
  Steam's overviews don't carry devkit_gameid (checked on the Frame
  2026-09-28), so 'list' now reads exe/start dir from app details.
- Photo-based grid/wide/hero slots render as JPEG (a noise-heavy 3840x1240
  hero was over 12 MiB as PNG on the Frame); the logo stays transparent PNG.
  Rendering gets 75 s and retries once with generated art. Each slot is
  cleared before it is set, since Steam keeps .png and .jpg side by side.
- Devkit titles keep their own VR flag (vr=None skips SetShortcutIsVR) and
  their Sideloaded collection.
- A failed title install's cleanup can't replace the original error.
- refresh_art for devkit titles (frame_titles.refresh_art).

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

frame/android/library_artwork.js

@@ -10,7 +10,7 @@ async function renderLibraryArtwork(input) {
       const img = new Image();
       img.src = `data:image/${item[0]};base64,${item[1]}`;
       await img.decode();
-      if (!img.width || !img.height || img.width*img.height > 8000000) throw Error('dimensions');
+      if (!img.width || !img.height || img.width*img.height > 16777216) throw Error('dimensions');
       images[slot] = img;
     } catch (_) { warnings.push(`${slot} could not be decoded; generated art used`); }
   }
@@ -138,7 +138,9 @@ async function renderLibraryArtwork(input) {
       if (slot==='wide') title(ctx,w,h,h*.69,h*.92,52);
       // Hero intentionally has no title: Steam overlays the transparent logo.
     }
-    result[slot]=canvas.toDataURL('image/png').split(',')[1];
+    // Photos as PNG can pass Steam's 12 MiB limit at hero size; the logo keeps its transparency.
+    const jpeg=scene && slot!=='logo' && slot!=='icon';
+    result[slot]=[jpeg?'jpg':'png', canvas.toDataURL(jpeg?'image/jpeg':'image/png',.9).split(',')[1]];
   }
   return {images:result,warnings,font};
 }