♿️(frontend) use higher contrast red for white text backgrounds

Replace current red with higher contrast variant when used as background with
white text to meet accessibility contrast requirements. Improves readability
for all users.

src/frontend/src/features/rooms/livekit/components/MutedMicIndicator.tsx

@@ -19,7 +19,7 @@ export const MutedMicIndicator = ({
   }
 
   return (
-    <Div padding={0.25} backgroundColor="red" borderRadius="4px">
+    <Div padding={0.25} backgroundColor="#E1000F" borderRadius="4px">
       <RiMicOffFill size={16} color="white" />
     </Div>
   )

src/frontend/src/features/rooms/livekit/components/controls/ChatToggle.tsx

@@ -48,7 +48,7 @@ export const ChatToggle = ({
             right: '-.25rem',
             width: '1rem',
             height: '1rem',
-            backgroundColor: 'red',
+            backgroundColor: '#E1000F',
             borderRadius: '50%',
             zIndex: 1,
             border: '2px solid #d1d5db',