fix(privacy): sanitize console error/warn to prevent PII leakage

Replace raw error object logging (which may contain Matrix event
payloads, user IDs, or message bodies) with e.message-only strings
in three files:
- CallEmbed.ts: state update and event widget feed errors
- msgContent.ts: image/video element load failures and thumb errors
- RoomInput.tsx: GIF send failure

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/app/features/room/RoomInput.tsx

@@ -725,7 +725,7 @@ export const RoomInput = forwardRef<HTMLDivElement, RoomInputProps>(
             info: { mimetype: 'image/gif', w, h, size: blob.size },
           });
         } catch (e) {
-          console.error('GIF send failed', e);
+          console.error('GIF send failed:', e instanceof Error ? e.message : 'unknown error');
           if (!alive()) return;
           setGifError('Failed to send GIF. Please try again.');
           setTimeout(() => setGifError(null), 4000);

src/app/features/room/msgContent.ts

@@ -50,7 +50,7 @@ export const getImageMsgContent = async (
 ): Promise<IContent> => {
   const { file, originalFile, encInfo, metadata } = item;
   const [imgError, imgEl] = await to(loadImageElement(getImageFileUrl(originalFile)));
-  if (imgError) console.warn(imgError);
+  if (imgError) console.warn('Failed to load image element:', imgError.message);
 
   const content: IContent = {
     msgtype: MsgType.Image,
@@ -85,7 +85,7 @@ export const getVideoMsgContent = async (
   const { file, originalFile, encInfo, metadata } = item;
 
   const [videoError, videoEl] = await to(loadVideoElement(getVideoFileUrl(originalFile)));
-  if (videoError) console.warn(videoError);
+  if (videoError) console.warn('Failed to load video element:', videoError.message);
 
   const content: IContent = {
     msgtype: MsgType.Video,
@@ -109,7 +109,7 @@ export const getVideoMsgContent = async (
         scaleYDimension(videoEl.videoWidth, 512, videoEl.videoHeight),
       );
     }
-    if (thumbError) console.warn(thumbError);
+    if (thumbError) console.warn('Failed to generate video thumbnail:', thumbError.message);
     content.info = {
       ...getVideoInfo(videoEl, file),
       ...thumbContent,

src/app/plugins/call/CallEmbed.ts

@@ -390,7 +390,7 @@ export class CallEmbed {
     if (this.call === null) return;
     const raw = ev.getEffectiveEvent();
     this.call.feedStateUpdate(raw as IRoomEvent).catch((e) => {
-      console.error('Error sending state update to widget: ', e);
+      console.error('Error sending state update to widget:', e instanceof Error ? e.message : 'unknown error');
     });
   }
 
@@ -496,7 +496,7 @@ export class CallEmbed {
       } else {
         const raw = ev.getEffectiveEvent();
         this.call.feedEvent(raw as IRoomEvent).catch((e) => {
-          console.error('Error sending event to widget: ', e);
+          console.error('Error sending event to widget:', e instanceof Error ? e.message : 'unknown error');
         });
       }
     }