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/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) => ({