fix(privacy): "Remove Photo Metadata" also covers emoji/sticker packs and badges (#332)

Custom emoji and sticker images, pack avatars and power-level badge
images were uploaded with their EXIF intact (GPS location, timestamp),
although they are published to every member of the room or space. Route
those three pickers through a new useStrippedFilePicker, which applies
the same stripImageMetadata as attachments and avatars.

Fixes #332

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017PCb59uY3UKqDqt7B6hzd5

src/app/components/image-pack-view/ImagePackContent.tsx

@@ -16,7 +16,7 @@ import { SettingTile } from '../setting-tile';
 import { UsageSwitcher } from './UsageSwitcher';
 import { ImagePackProfile, ImagePackProfileEdit } from './PackMeta';
 import * as css from './style.css';
-import { useFilePicker } from '../../hooks/useFilePicker';
+import { useStrippedFilePicker } from '../../hooks/useStrippedFilePicker';
 import { CompactUploadCardRenderer } from '../upload-card';
 import { UploadSuccess } from '../../state/upload';
 import { getImageInfo, TUploadContent } from '../../utils/matrix';
@@ -60,7 +60,7 @@ export const ImagePackContent = as<'div', ImagePackContentProps>(
       [imagePack, savedImages, uploadedImages],
     );
 
-    const pickFiles = useFilePicker(
+    const pickFiles = useStrippedFilePicker(
       useCallback(
         (pickedFiles: File[]) => {
           const uniqueFiles = pickedFiles.map((file) => {