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/tools/favicon.ts

@@ -2,6 +2,7 @@ import { randomUUID } from "node:crypto";
 import archiver from "archiver";
 import type { FastifyInstance } from "fastify";
 import sharp from "sharp";
+import { ensureSharpCompat } from "../../lib/heic-converter.js";
 
 const FAVICON_SIZES = [
   { name: "favicon-16x16.png", size: 16, format: "png" as const },
@@ -39,6 +40,9 @@ export function registerFavicon(app: FastifyInstance) {
     }
 
     try {
+      // Decode HEIC/HEIF if needed
+      fileBuffer = await ensureSharpCompat(fileBuffer);
+
       const jobId = randomUUID();
 
       reply.hijack();