fix(library): fix RAW develop fallback & optimize STUDIO to LIBRARY transition speed

docker/frontend/src/Library.tsx

@@ -562,13 +562,7 @@ export function Library() {
     keep(VIEW_KEY, view);
   }, [view]);
 
-  // Clear global memory caches when leaving Library screen
-  useEffect(() => {
-    return () => {
-      shots.clear();
-      clearLibraryCache();
-    };
-  }, []);
+  // Keep global memory caches in RAM during SPA tab navigation between STUDIO and LIBRARY
 
   // The menu closes on the next click anywhere but its own items, and on Escape.
   // Escape is the whole reason this listens on the document instead of sitting

docker/frontend/src/engine/library.ts

@@ -893,8 +893,8 @@ export async function scanFolder(
     }
     const raw = isRawName(file.name);
     const isTiff = /\.(tiff?)$/i.test(file.name);
-    const RAW_HEADER_BYTES = 4 * 1024 * 1024;
-    const sliceBuffer = await file.slice(0, (raw || isTiff) ? (isTiff ? Math.min(file.size, 16 * 1024 * 1024) : RAW_HEADER_BYTES) : HEAD_BYTES).arrayBuffer();
+    const RAW_HEADER_BYTES = 16 * 1024 * 1024;
+    const sliceBuffer = await file.slice(0, (raw || isTiff) ? Math.min(file.size, RAW_HEADER_BYTES) : HEAD_BYTES).arrayBuffer();
     const bytes = new Uint8Array(sliceBuffer);
     const preview = (raw || isTiff) ? await rawThumbnail(bytes, file.name) : null;
     const src = preview ? new Blob([preview as BlobPart], { type: 'image/jpeg' }) : raw ? null : file;

docker/frontend/src/engine/rawDevelop.ts

@@ -664,8 +664,12 @@ export async function developRaw(bytes: Uint8Array): Promise<Uint8Array> {
     // The preview still opens the file when the sensor will not: a RAW whose
     // colour data is missing (some DNG) is not a RAW that cannot be shown.
     if (preview) return preview;
+    const fallback = await rawThumbnail(bytes).catch(() => null);
+    if (fallback) return fallback;
     throw err;
   } finally {
-    raw.dispose();
+    try {
+      raw.dispose();
+    } catch {}
   }
 }