Use heic-convert for HEIC-to-JPEG conversion

Sharp's prebuilt libvips lacks HEIF codec support. Replace with
heic-convert (pure JS decoder) for reliable HEIC conversion on all
platforms. Existing HEIC files on disk will be converted on-the-fly
when served via /api/files.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

src/app/api/family-upload/route.ts

@@ -3,7 +3,7 @@ import { writeFile, mkdir } from 'fs/promises'
 import path from 'path'
 import { randomUUID } from 'crypto'
 import { getDb } from '@/lib/db'
-import sharp from 'sharp'
+import { convertHeicToJpeg } from '@/lib/heic'
 
 export const runtime = 'nodejs'
 export const maxDuration = 60
@@ -77,7 +77,7 @@ export async function POST(req: NextRequest) {
   let finalExt = ext
   if (mimeType === 'image/heic' || mimeType === 'image/heif') {
     try {
-      finalBuffer = Buffer.from(await sharp(buffer).jpeg({ quality: 90 }).toBuffer())
+      finalBuffer = await convertHeicToJpeg(buffer)
       finalExt = '.jpg'
     } catch {
       // Conversion failed — keep original

src/app/api/files/[...path]/route.ts

@@ -2,6 +2,7 @@ import { NextRequest, NextResponse } from 'next/server'
 import fs from 'fs'
 import path from 'path'
 import sharp from 'sharp'
+import { convertHeicToJpeg } from '@/lib/heic'
 
 export const runtime = 'nodejs'
 
@@ -55,7 +56,7 @@ export async function GET(
       contentType = 'image/jpeg'
     } else {
       try {
-        const converted = await sharp(fs.readFileSync(filePath), { failOn: 'none' }).jpeg({ quality: 90 }).toBuffer()
+        const converted = await convertHeicToJpeg(fs.readFileSync(filePath))
         fs.writeFileSync(jpegPath, converted)
         fileToSendPath = jpegPath
         ext = '.jpg'

src/app/api/upload/route.ts

@@ -4,7 +4,7 @@ import path from 'path'
 import { cookies } from 'next/headers'
 import { createHash, randomUUID } from 'crypto'
 import { getDb } from '@/lib/db'
-import sharp from 'sharp'
+import { convertHeicToJpeg } from '@/lib/heic'
 
 export const runtime = 'nodejs'
 export const maxDuration = 60
@@ -112,8 +112,8 @@ export async function POST(req: NextRequest) {
     // Convert HEIC/HEIF to JPEG so all browsers can display it
     if (mimeType === 'image/heic' || mimeType === 'image/heif') {
       try {
-        const converted = await sharp(buffer).jpeg({ quality: 90 }).toBuffer()
-        buffer = converted as unknown as Buffer
+        const converted = await convertHeicToJpeg(buffer)
+        buffer = converted
         ext = '.jpg'
         mimeType = 'image/jpeg'
       } catch {

src/lib/heic.ts

@@ -0,0 +1,15 @@
+// @ts-expect-error no type declarations available
+import heicConvert from 'heic-convert'
+
+/**
+ * Convert HEIC/HEIF buffer to JPEG.
+ * Uses heic-convert (pure JS) since sharp's prebuilt libvips lacks HEIF support.
+ */
+export async function convertHeicToJpeg(buffer: Buffer): Promise<Buffer> {
+  const result = await heicConvert({
+    buffer,
+    format: 'JPEG',
+    quality: 0.9,
+  })
+  return Buffer.from(result)
+}