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/split.ts

@@ -4,6 +4,7 @@ import archiver from "archiver";
 import type { FastifyInstance } from "fastify";
 import sharp from "sharp";
 import { z } from "zod";
+import { ensureSharpCompat } from "../../lib/heic-converter.js";
 
 const settingsSchema = z.object({
   columns: z.number().min(1).max(10).default(2),
@@ -57,6 +58,9 @@ export function registerSplit(app: FastifyInstance) {
     }
 
     try {
+      // Decode HEIC/HEIF if needed
+      fileBuffer = await ensureSharpCompat(fileBuffer);
+
       const metadata = await sharp(fileBuffer).metadata();
       const fullW = metadata.width ?? 0;
       const fullH = metadata.height ?? 0;