fix(web): remember last selected workspace after re-login

Stop clearing multica_workspace_id from localStorage on logout so it
persists as a preference hint. On fresh login, pass the stored ID to
hydrateWorkspace so the user returns to their last workspace instead
of always landing on the first one.

apps/web/app/(auth)/login/page.tsx

@@ -153,7 +153,8 @@ function LoginPageContent() {
 
         await verifyCode(email, value);
         const wsList = await api.listWorkspaces();
-        await hydrateWorkspace(wsList);
+        const lastWsId = localStorage.getItem("multica_workspace_id");
+        await hydrateWorkspace(wsList, lastWsId);
         router.push(searchParams.get("next") || "/issues");
       } catch (err) {
         setError(

apps/web/features/auth/store.ts

@@ -36,7 +36,6 @@ export const useAuthStore = create<AuthState>((set) => ({
       api.setToken(null);
       api.setWorkspaceId(null);
       localStorage.removeItem("multica_token");
-      localStorage.removeItem("multica_workspace_id");
       set({ user: null, isLoading: false });
     }
   },
@@ -56,7 +55,6 @@ export const useAuthStore = create<AuthState>((set) => ({
 
   logout: () => {
     localStorage.removeItem("multica_token");
-    localStorage.removeItem("multica_workspace_id");
     api.setToken(null);
     api.setWorkspaceId(null);
     clearLoggedInCookie();

apps/web/features/workspace/store.ts

@@ -233,7 +233,6 @@ export const useWorkspaceStore = create<WorkspaceStore>((set, get) => ({
 
   clearWorkspace: () => {
     api.setWorkspaceId(null);
-    localStorage.removeItem("multica_workspace_id");
     set({ workspace: null, workspaces: [], members: [], agents: [], skills: [] });
   },
 }));