feat: add store methods for deleted user cleanup

Add removeRequestsForUser (socialStore), removeUser (discoverStore), and
clearTypingForUser (chatStore) to support isDeleted cleanup in the
user_updated WS handler.

packages/web/src/stores/chatStore.ts

@@ -64,6 +64,7 @@ interface ChatState {
   onMarkUnread: (channelId: string, messageId: string) => void;
   removeChannelStates: (channelIds: Set<string>) => void;
   updateUserInMessages: (user: { id: string; [key: string]: any }) => void;
+  clearTypingForUser: (userId: string) => void;
 }
 
 /** Find which channel a message belongs to by scanning the message cache. */
@@ -727,4 +728,19 @@ export const useChatStore = create<ChatState>((set, get) => ({
       return changed ? { messages: newMessages } : {};
     });
   },
+
+  clearTypingForUser: (userId: string) => {
+    set((state) => {
+      const newTyping = new Map(state.typingUsers);
+      let changed = false;
+      for (const [channelId, users] of newTyping) {
+        const filtered = users.filter(t => t.userId !== userId);
+        if (filtered.length !== users.length) {
+          newTyping.set(channelId, filtered);
+          changed = true;
+        }
+      }
+      return changed ? { typingUsers: newTyping } : state;
+    });
+  },
 }));

packages/web/src/stores/discoverStore.ts

@@ -20,6 +20,7 @@ interface DiscoverState {
   fetchUsers: (query?: string) => Promise<void>;
   setSearchQuery: (q: string) => void;
   updateRelationship: (userId: string, origin: string, relationship: DiscoverUser['relationship'], requestId?: string) => void;
+  removeUser: (userId: string) => void;
   reset: () => void;
 }
 
@@ -111,6 +112,13 @@ export const useDiscoverStore = create<DiscoverState>((set) => ({
     }));
   },
 
+  removeUser: (userId: string) => {
+    set((state) => ({
+      users: state.users.filter(u => u.id !== userId),
+      total: Math.max(0, state.total - state.users.filter(u => u.id === userId).length),
+    }));
+  },
+
   reset: () => set({
     users: [],
     searchQuery: '',

packages/web/src/stores/socialStore.ts

@@ -56,6 +56,7 @@ interface SocialState {
   updateFriendProfile: (user: User) => void;
   removeFriendLocally: (userId: string, origin: string) => void;
   removeRequestById: (requestId: string, origin: string) => void;
+  removeRequestsForUser: (userId: string) => void;
   reset: () => void;
 }
 
@@ -326,6 +327,13 @@ export const useSocialStore = create<SocialState>((set, get) => ({
     }));
   },
 
+  // Called when a user is deleted — remove all pending requests involving them
+  removeRequestsForUser: (userId: string) => {
+    set((state) => ({
+      requests: state.requests.filter(r => r.fromId !== userId && r.toId !== userId),
+    }));
+  },
+
   // Called from WS handler on presence_update to keep friend status live
   updateFriendPresence: (userId: string, status: string) => {
     set((state) => ({