feat: comprehensive HEIC/HEIF support and edit-metadata ExifTool overhaul

- Add ensureSharpCompat() helper for automatic HEIC detection and decode
- Fix HEIC support in all 14 custom-route tools (image-to-pdf, split,
  barcode-read, compose, collage, stitch, compare, find-duplicates,
  color-palette, watermark-image, vectorize, favicon, info, branding)
- Fix PdfPagePreview using store's decoded blobUrl instead of raw File
- Add onError fallback in ImageViewer for unrenderable formats
- Fix image-to-pdf progress bar with flushSync for reliable rendering
- Add ExifTool backend for edit-metadata (GPS, keywords, IPTC, dates)
- Rename Strip Metadata to Remove Metadata with interactive Leaflet map
- Fix user-files thumbnail generation for stored HEIC files
- Fix info tool stats() histogram for HEIC via decoded buffer
- Skip HEIC preprocessing in batch route for metadata tools

apps/api/src/routes/batch.ts

@@ -146,10 +146,14 @@ export async function registerBatchRoutes(app: FastifyInstance): Promise<void> {
 
             try {
               let processBuffer = file.buffer;
-              if (validation.format === "heif") {
+              // Skip HEIC decode and auto-orient for edit-metadata (ExifTool handles all formats natively)
+              const skipPreprocess = toolId === "edit-metadata" || toolId === "strip-metadata";
+              if (!skipPreprocess && validation.format === "heif") {
                 processBuffer = await decodeHeic(processBuffer);
               }
-              processBuffer = await autoOrient(processBuffer);
+              if (!skipPreprocess) {
+                processBuffer = await autoOrient(processBuffer);
+              }
               const result = await toolConfig.process(processBuffer, settings, file.filename);
 
               results[index] = { buffer: result.buffer, filename: result.filename };