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

packages/image-engine/src/types.ts

@@ -73,6 +73,18 @@ export interface EditMetadataOptions {
   dateTimeOriginal?: string;
   clearGps?: boolean;
   fieldsToRemove?: string[];
+  gpsLatitude?: number;
+  gpsLongitude?: number;
+  gpsAltitude?: number;
+  keywords?: string[];
+  keywordsMode?: "add" | "set";
+  dateShift?: string;
+  setAllDates?: string;
+  iptcTitle?: string;
+  iptcHeadline?: string;
+  iptcCity?: string;
+  iptcState?: string;
+  iptcCountry?: string;
 }
 
 export interface BrightnessOptions {