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/info.ts

@@ -1,6 +1,7 @@
 import { basename } from "node:path";
 import type { FastifyInstance, FastifyReply, FastifyRequest } from "fastify";
 import sharp from "sharp";
+import { ensureSharpCompat } from "../../lib/heic-converter.js";
 
 /**
  * Image info route - read-only, returns JSON metadata.
@@ -35,8 +36,12 @@ export function registerInfo(app: FastifyInstance) {
     }
 
     try {
+      // Read metadata from original buffer (Sharp can read HEIF container metadata)
       const metadata = await sharp(fileBuffer).metadata();
-      const stats = await sharp(fileBuffer).stats();
+
+      // stats() requires pixel decoding, so decode HEIC/HEIF first
+      const decodedBuffer = await ensureSharpCompat(fileBuffer);
+      const stats = await sharp(decodedBuffer).stats();
 
       // Build histogram data from stats
       const histogram = stats.channels.map((ch, i) => ({