feat: backup/restore, user profile popover, image compress, video blur, wake lock

- backup/restore dialog + user profile popover components
- image compression, video blur, wake lock utilities
- message cache + conversation messages hook refinements
- call context, active speakers, screen share dialog tweaks
- audio + screen share settings persistence
- refreshed app icons (smaller sizes) across all platforms

apps/desktop/src/lib/imageCompress.ts

@@ -0,0 +1,57 @@
+// Client-side image compression before upload. Downscales huge photos
+// (phone cameras regularly emit 4000×3000+ at 5MB+) to a size that
+// actually makes sense for chat display. Preserves aspect ratio.
+//
+// Skips animated formats (gif/apng/webp) to keep motion, and skips
+// already-small files to avoid useless re-encode overhead.
+
+const MAX_DIM = 2048;
+const TARGET_QUALITY = 0.85;
+const SKIP_BELOW_BYTES = 512 * 1024; // 512KB — not worth re-encoding
+const ANIMATED_MIME = /^image\/(gif|apng|webp)$/;
+
+export async function compressImage(file: File): Promise<File> {
+  if (!file.type.startsWith('image/')) return file;
+  if (ANIMATED_MIME.test(file.type)) return file;
+  if (file.size < SKIP_BELOW_BYTES) return file;
+  if (typeof createImageBitmap !== 'function') return file;
+  if (typeof OffscreenCanvas !== 'function') return file;
+
+  try {
+    const bitmap = await createImageBitmap(file);
+    const largest = Math.max(bitmap.width, bitmap.height);
+    const scale = largest > MAX_DIM ? MAX_DIM / largest : 1;
+    const w = Math.max(1, Math.round(bitmap.width * scale));
+    const h = Math.max(1, Math.round(bitmap.height * scale));
+    const canvas = new OffscreenCanvas(w, h);
+    const ctx = canvas.getContext('2d');
+    if (!ctx) {
+      bitmap.close();
+      return file;
+    }
+    ctx.drawImage(bitmap, 0, 0, w, h);
+    bitmap.close();
+    const blob = await canvas.convertToBlob({
+      type: 'image/webp',
+      quality: TARGET_QUALITY,
+    });
+    // If the re-encoded blob is actually larger (small PNGs can expand as
+    // WebP), keep the original.
+    if (blob.size >= file.size) return file;
+    const name = renameToWebp(file.name);
+    return new File([blob], name, { type: 'image/webp', lastModified: file.lastModified });
+  } catch (err: unknown) {
+    console.warn('compressImage failed — keeping original', err);
+    return file;
+  }
+}
+
+function renameToWebp(original: string): string {
+  const dot = original.lastIndexOf('.');
+  const base = dot > 0 ? original.slice(0, dot) : original;
+  return base + '.webp';
+}
+
+export async function compressImages(files: File[]): Promise<File[]> {
+  return Promise.all(files.map((f) => compressImage(f)));
+}