fix(settings): enable profile save and avatar selection

store/auth.ts

@@ -12,6 +12,7 @@ interface AuthState {
   submitVerification: (role: UserRole) => void
   approveVerification: (role: UserRole) => void
   rejectVerification: (role: UserRole, reason: string) => void
+  updateProfile: (patch: { nickname?: string; bio?: string; avatar?: string }) => void
   login: (user: User, verifiedRoles?: UserRole[]) => void
   logout: () => void
 }
@@ -83,6 +84,19 @@ export const useAuthStore = create<AuthState>((set, get) => ({
         },
       }
     }),
+  updateProfile: (patch) =>
+    set((state) => {
+      if (!state.user) return state
+
+      return {
+        user: {
+          ...state.user,
+          nickname: patch.nickname ?? state.user.nickname,
+          bio: patch.bio ?? state.user.bio,
+          avatar: patch.avatar ?? state.user.avatar,
+        },
+      }
+    }),
   login: (user, verifiedRoles = ["consumer"]) =>
     set({
       isAuthenticated: true,