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/audioSettings.ts

@@ -16,12 +16,27 @@ export interface AudioSettings {
   // Preferred output (speaker/headphone) deviceId. null = system default.
   // Applied to every <audio> element we attach via HTMLMediaElement.setSinkId.
   outputDeviceId: string | null;
+  // RMS threshold (0..1) for the "is this participant talking" ring. Lower =
+  // more sensitive. Default 0.03 catches soft speech without lighting up on
+  // keyboard noise. Users on quiet mics can lower; users in noisy rooms bump up.
+  voiceThreshold: number;
+  // Per-publish DSP toggle. Off lets hifi-style music go through unmodified;
+  // on cleans up voice when the quality preset doesn't already imply it.
+  // Defaults to "follow the quality preset".
+  noiseSuppression: boolean;
+  // Background blur on the local camera track. Lazy — requires
+  // @livekit/track-processors + its MediaPipe selfie-segmentation model
+  // (~1.5MB) which downloads on first activation.
+  videoBackgroundBlur: boolean;
 }
 
 const DEFAULTS: AudioSettings = {
   quality: 'voice',
   inputDeviceId: null,
   outputDeviceId: null,
+  voiceThreshold: 0.03,
+  noiseSuppression: true,
+  videoBackgroundBlur: false,
 };
 
 export interface AudioQualityParams {
@@ -80,6 +95,7 @@ function read(): AudioSettings {
       return cached;
     }
     const parsed = JSON.parse(raw) as Partial<AudioSettings>;
+    const rawThreshold = typeof parsed.voiceThreshold === 'number' ? parsed.voiceThreshold : NaN;
     cached = {
       quality: isQuality(parsed.quality) ? parsed.quality : DEFAULTS.quality,
       inputDeviceId:
@@ -90,6 +106,18 @@ function read(): AudioSettings {
         typeof parsed.outputDeviceId === 'string' && parsed.outputDeviceId.length > 0
           ? parsed.outputDeviceId
           : DEFAULTS.outputDeviceId,
+      voiceThreshold:
+        Number.isFinite(rawThreshold) && rawThreshold >= 0.005 && rawThreshold <= 0.2
+          ? rawThreshold
+          : DEFAULTS.voiceThreshold,
+      noiseSuppression:
+        typeof parsed.noiseSuppression === 'boolean'
+          ? parsed.noiseSuppression
+          : DEFAULTS.noiseSuppression,
+      videoBackgroundBlur:
+        typeof parsed.videoBackgroundBlur === 'boolean'
+          ? parsed.videoBackgroundBlur
+          : DEFAULTS.videoBackgroundBlur,
     };
     return cached;
   } catch {