feat: implement initial Electron chat application with core UI components and Convex backend integration.

convex/voiceState.ts

@@ -70,6 +70,16 @@ export const updateState = mutation({
         Object.entries(updates).filter(([, val]) => val !== undefined)
       );
       await ctx.db.patch(existing._id, filtered);
+
+      // When a user stops screen sharing, clear all viewers watching their stream
+      if (args.isScreenSharing === false) {
+        const allStates = await ctx.db.query("voiceStates").collect();
+        for (const s of allStates) {
+          if (s.watchingStream === args.userId) {
+            await ctx.db.patch(s._id, { watchingStream: undefined });
+          }
+        }
+      }
     }
 
     return null;
@@ -105,6 +115,28 @@ export const serverMute = mutation({
   },
 });
 
+export const setWatchingStream = mutation({
+  args: {
+    userId: v.id("userProfiles"),
+    watchingStream: v.optional(v.id("userProfiles")),
+  },
+  returns: v.null(),
+  handler: async (ctx, args) => {
+    const existing = await ctx.db
+      .query("voiceStates")
+      .withIndex("by_user", (q) => q.eq("userId", args.userId))
+      .first();
+
+    if (existing) {
+      await ctx.db.patch(existing._id, {
+        watchingStream: args.watchingStream ?? undefined,
+      });
+    }
+
+    return null;
+  },
+});
+
 export const getAll = query({
   args: {},
   returns: v.any(),
@@ -119,6 +151,7 @@ export const getAll = query({
       isScreenSharing: boolean;
       isServerMuted: boolean;
       avatarUrl: string | null;
+      watchingStream: string | null;
     }>> = {};
 
     for (const s of states) {
@@ -136,6 +169,7 @@ export const getAll = query({
         isScreenSharing: s.isScreenSharing,
         isServerMuted: s.isServerMuted,
         avatarUrl,
+        watchingStream: s.watchingStream ?? null,
       });
     }
 
@@ -177,6 +211,14 @@ export const afkMove = mutation({
       isServerMuted: currentState.isServerMuted,
     });
 
+    // Clear viewers watching the moved user's stream (screen sharing stops on AFK move)
+    const allStates = await ctx.db.query("voiceStates").collect();
+    for (const s of allStates) {
+      if (s.watchingStream === args.userId) {
+        await ctx.db.patch(s._id, { watchingStream: undefined });
+      }
+    }
+
     return null;
   },
 });