feat: Add base UI styling, ChatArea and VoiceStage components, and a screenshare sound asset.

Frontend/Electron/src/components/ChatArea.jsx

@@ -498,6 +498,9 @@ const ChatArea = ({ channelId, channelName, channelType, username, channelKey, u
     const isLoadingMoreRef = useRef(false);
     const userSentMessageRef = useRef(false);
     const topSentinelRef = useRef(null);
+    const notifiedMessageIdsRef = useRef(new Set());
+    const pendingNotificationIdsRef = useRef(new Set());
+    const lastPingTimeRef = useRef(0);
 
     const convex = useConvex();
 
@@ -688,6 +691,8 @@ const ChatArea = ({ channelId, channelName, channelType, username, channelKey, u
         // Don't clear messageDecryptionCache — it persists across channel switches
         setDecryptedMessages([]);
         isInitialLoadRef.current = true;
+        notifiedMessageIdsRef.current = new Set();
+        pendingNotificationIdsRef.current = new Set();
         setReplyingTo(null);
         setEditingMessage(null);
         setMentionQuery(null);
@@ -695,6 +700,58 @@ const ChatArea = ({ channelId, channelName, channelType, username, channelKey, u
         onTogglePinned();
     }, [channelId, channelKey]);
 
+    // Play ping sound when a new message mentions us (by username or role)
+    useEffect(() => {
+        if (!decryptedMessages.length) return;
+
+        // Initial load: seed all IDs, no sound
+        if (isInitialLoadRef.current) {
+            for (const msg of decryptedMessages) {
+                if (msg.id) notifiedMessageIdsRef.current.add(msg.id);
+            }
+            return;
+        }
+
+        let shouldPing = false;
+
+        // Check newest messages (end of array) backwards — stop at first known ID
+        for (let i = decryptedMessages.length - 1; i >= 0; i--) {
+            const msg = decryptedMessages[i];
+            if (!msg.id) continue;
+            if (notifiedMessageIdsRef.current.has(msg.id)) break;
+
+            // Skip own messages
+            if (msg.sender_id === currentUserId) {
+                notifiedMessageIdsRef.current.add(msg.id);
+                continue;
+            }
+
+            // Still decrypting — mark pending
+            if (msg.content === '[Decrypting...]') {
+                pendingNotificationIdsRef.current.add(msg.id);
+                continue;
+            }
+
+            notifiedMessageIdsRef.current.add(msg.id);
+            pendingNotificationIdsRef.current.delete(msg.id);
+
+            if (isMentionedInContent(msg.content)) shouldPing = true;
+        }
+
+        // Re-check previously pending messages now decrypted
+        if (!shouldPing && pendingNotificationIdsRef.current.size > 0) {
+            for (const msg of decryptedMessages) {
+                if (!pendingNotificationIdsRef.current.has(msg.id)) continue;
+                if (msg.content === '[Decrypting...]') continue;
+                pendingNotificationIdsRef.current.delete(msg.id);
+                notifiedMessageIdsRef.current.add(msg.id);
+                if (isMentionedInContent(msg.content)) shouldPing = true;
+            }
+        }
+
+        if (shouldPing) playPingSound();
+    }, [decryptedMessages, currentUserId, isMentionedInContent, playPingSound]);
+
     // Capture the unread divider position when read state loads for a channel
     const unreadDividerCapturedRef = useRef(null);
     useEffect(() => {
@@ -740,6 +797,23 @@ const ChatArea = ({ channelId, channelName, channelType, username, channelKey, u
     ];
     const myRoleNames = members?.find(m => m.username === username)?.roles?.map(r => r.name) || [];
 
+    const isMentionedInContent = useCallback((content) => {
+        if (!content) return false;
+        return content.includes(`@${username}`) ||
+            myRoleNames.some(rn =>
+                rn.startsWith('@') ? content.includes(rn) : content.includes(`@role:${rn}`)
+            );
+    }, [username, myRoleNames]);
+
+    const playPingSound = useCallback(() => {
+        const now = Date.now();
+        if (now - lastPingTimeRef.current < 1000) return;
+        lastPingTimeRef.current = now;
+        const audio = new Audio(PingSound);
+        audio.volume = 0.5;
+        audio.play().catch(() => {});
+    }, []);
+
     const scrollToBottom = useCallback((force = false) => {
         const container = messagesContainerRef.current;
         if (!container) return;
@@ -1194,14 +1268,7 @@ const ChatArea = ({ channelId, channelName, channelType, username, channelKey, u
                     {decryptedMessages.map((msg, idx) => {
                         const currentDate = new Date(msg.created_at);
                         const previousDate = idx > 0 ? new Date(decryptedMessages[idx - 1].created_at) : null;
-                        const isMentioned = msg.content && (
-                            msg.content.includes(`@${username}`) ||
-                            myRoleNames.some(rn =>
-                                rn.startsWith('@')
-                                    ? msg.content.includes(rn)
-                                    : msg.content.includes(`@role:${rn}`)
-                            )
-                        );
+                        const isMentioned = isMentionedInContent(msg.content);
                         const isOwner = msg.username === username;
                         const canDelete = isOwner || !!myPermissions?.manage_messages;
 

Frontend/Electron/src/components/VoiceStage.jsx

@@ -526,8 +526,6 @@ const FocusedStreamView = ({
                     height: participantsCollapsed ? 0 : BOTTOM_BAR_HEIGHT,
                     overflow: 'hidden',
                     transition: 'height 0.25s ease',
-                    backgroundColor: '#1e1f22',
-                    borderTop: participantsCollapsed ? 'none' : '1px solid #2f3136',
                 }}>
                     <div style={{
                         height: BOTTOM_BAR_HEIGHT,

Frontend/Electron/src/index.css

@@ -1958,6 +1958,7 @@ body {
   color: var(--text-muted);
   transition: background-color 0.1s;
   position: relative;
+  margin-bottom: 4px;
 }
 
 .dm-item:hover {