fixes

js/desktop/src/components/human-avatar.tsx

@@ -2,8 +2,10 @@ import * as React from 'react';
 import { Avatar, AvatarFallback, AvatarImage } from '@/components/ui/avatar';
 import { useAvatarUrl } from '@/hooks/use-avatar-url';
 
-interface HumanAvatarProps
-  extends Omit<React.ComponentProps<typeof Avatar>, 'children'> {
+interface HumanAvatarProps extends Omit<
+  React.ComponentProps<typeof Avatar>,
+  'children'
+> {
   /** Object id of the human's profile picture, if any. */
   avatarObjectId?: string | null;
   /** Initials rendered while loading or when no picture is set. */

js/desktop/src/features/settings/avatar-edit-dialog.tsx

@@ -14,6 +14,7 @@ import { Button } from '@/components/ui/button';
 import { Muted } from '@/components/ui/typography';
 import { apiClient } from '@/api/client';
 import { useAuthStore } from '@/stores/auth-store';
+import { useMediaDevicesStore } from '@/stores/media-devices-store';
 import { useAvatarUrl } from '@/hooks/use-avatar-url';
 import { useFileInput } from '@/hooks/use-file-input';
 import { toAvatarBlob } from '@/lib/avatar-image';
@@ -30,7 +31,10 @@ interface AvatarEditDialogProps {
   onOpenChange: (open: boolean) => void;
 }
 
-export function AvatarEditDialog({ open, onOpenChange }: AvatarEditDialogProps) {
+export function AvatarEditDialog({
+  open,
+  onOpenChange,
+}: AvatarEditDialogProps) {
   const user = useAuthStore((s) => s.user);
   const refreshUser = useAuthStore((s) => s.refreshUser);
   const currentUrl = useAvatarUrl(user?.avatar_object_id);
@@ -156,11 +160,7 @@ export function AvatarEditDialog({ open, onOpenChange }: AvatarEditDialogProps)
         <div className="flex flex-col items-center gap-4 py-1">
           <div className="bg-muted flex size-24 items-center justify-center overflow-hidden rounded-full border">
             {previewUrl ? (
-              <img
-                src={previewUrl}
-                alt=""
-                className="size-full object-cover"
-              />
+              <img src={previewUrl} alt="" className="size-full object-cover" />
             ) : (
               <span className="text-muted-foreground text-2xl font-medium">
                 {initials}
@@ -221,12 +221,7 @@ export function AvatarEditDialog({ open, onOpenChange }: AvatarEditDialogProps)
               Remove
             </Button>
           )}
-          <Button
-            variant="outline"
-            size="sm"
-            onClick={close}
-            disabled={busy}
-          >
+          <Button variant="outline" size="sm" onClick={close} disabled={busy}>
             Cancel
           </Button>
           <Button size="sm" onClick={handleSave} disabled={!prepared || busy}>
@@ -250,6 +245,10 @@ function CameraCapture({
   const [stream, setStream] = useState<MediaStream | null>(null);
   const [error, setError] = useState<string | null>(null);
   const [capturing, setCapturing] = useState(false);
+  // Honor the camera the user picked in Audio & Video settings. `ideal` rather
+  // than `exact` so a since-unplugged device falls back to the default instead
+  // of throwing OverconstrainedError.
+  const savedCameraId = useMediaDevicesStore((s) => s.camera?.deviceId);
 
   useEffect(() => {
     if (!active) return;
@@ -257,8 +256,11 @@ function CameraCapture({
     let cancelled = false;
     let acquired: MediaStream | null = null;
 
+    const video: MediaTrackConstraints = { aspectRatio: { ideal: 1 } };
+    if (savedCameraId) video.deviceId = { ideal: savedCameraId };
+
     navigator.mediaDevices
-      .getUserMedia({ video: { aspectRatio: { ideal: 1 } }, audio: false })
+      .getUserMedia({ video, audio: false })
       .then((s) => {
         if (cancelled) {
           s.getTracks().forEach((t) => t.stop());
@@ -280,7 +282,7 @@ function CameraCapture({
       acquired?.getTracks().forEach((t) => t.stop());
       setStream(null);
     };
-  }, [active]);
+  }, [active, savedCameraId]);
 
   useEffect(() => {
     if (videoRef.current) videoRef.current.srcObject = stream;
@@ -288,7 +290,12 @@ function CameraCapture({
 
   const handleCapture = async () => {
     const video = videoRef.current;
-    if (!video) return;
+    // readyState < HAVE_CURRENT_DATA (or zero dimensions) means no frame has
+    // decoded yet — capturing now would grab a blank image.
+    if (!video || video.readyState < 2 || !video.videoWidth) {
+      toast.error('Camera is still starting — try again in a moment.');
+      return;
+    }
     setCapturing(true);
     try {
       const bitmap = await createImageBitmap(video);
@@ -324,11 +331,7 @@ function CameraCapture({
           className="size-full -scale-x-100 object-cover"
         />
       </div>
-      <Button
-        size="sm"
-        onClick={handleCapture}
-        disabled={!stream || capturing}
-      >
+      <Button size="sm" onClick={handleCapture} disabled={!stream || capturing}>
         <Camera className="mr-1 size-3.5" />
         Capture
       </Button>

js/desktop/src/lib/avatar-image.ts

@@ -11,6 +11,11 @@ export async function toAvatarBlob(
   { size = 512, mirror = false }: { size?: number; mirror?: boolean } = {},
 ): Promise<Blob> {
   const side = Math.min(source.width, source.height);
+  if (side === 0) {
+    // A not-yet-decoded <video> or a corrupt image yields a zero-size source;
+    // cropping it would silently produce a blank avatar, so fail instead.
+    throw new Error('Image source has zero dimensions');
+  }
   const sx = (source.width - side) / 2;
   const sy = (source.height - side) / 2;