perf(dashboard): load core data in parallel with /me

The dashboard no longer waits for /me before it calls the library.
History loads when games-count says canSync or fails. Refs #40.

src/hooks/useDashboardData.js

@@ -60,17 +60,16 @@ export default function useDashboardData() {
 
     useEffect(() => {
         const fetchUserData = async () => {
-            const {ok, status, data} = await reloadUser();
-            if (ok) {
-                // Games added by hand need no Steam ID. The history and the achievements (Steam achievements,
-                // PlayStation trophies) also come from a PlayStation link, which games-count reports as canSync.
-                const [counts] = await Promise.all([fetchSteamCount(), fetchTopGames(), fetchPlaying(), fetchUpNext(),
-                    fetchSummary(), ...(data.steamId ? [fetchActivity(), fetchAchievements()] : [])]);
-                if (!data.steamId && counts?.canSync) await Promise.all([fetchActivity(), fetchAchievements()]);
-            } else if (status === 0) {
-                setError('INFO.ERROR.NETWORK_FAILURE');
-            } else if (status !== 401) {
-                setError('INFO.ERROR.LOAD_PROFILE');
+            // Core calls do not wait for /me. canSync is true with a Steam ID or a PlayStation link; when games-count
+            // fails there is no answer, so the history is asked anyway.
+            const withHistory = fetchSteamCount().then(async (counts) => {
+                if (counts == null || counts.canSync) await Promise.all([fetchActivity(), fetchAchievements()]);
+            });
+            const [{ok, status}] = await Promise.all([reloadUser(), withHistory, fetchTopGames(), fetchPlaying(),
+                fetchUpNext(), fetchSummary()]);
+            if (!ok) {
+                if (status === 0) setError('INFO.ERROR.NETWORK_FAILURE');
+                else if (status !== 401) setError('INFO.ERROR.LOAD_PROFILE');
             }
             setIsLoading(false);
         };

src/pages/Dashboard.test.jsx

@@ -32,7 +32,7 @@ const dashboardRoutes = (settings) => ({
     'GET /api/library/steam-profile': json(200, {personaName: 'Lobo', avatarUrl: avatar}),
     'GET /api/library/activity': json(200, {totalMinutes: 90, days: [{day: '2026-09-23', minutes: 0}, {day: '2026-09-24', minutes: 90}], recentGames: [
         {appid: 1086940, name: "Baldur's Gate 3", playtimeMinutes: 900, playtime2Weeks: 90, status: 'PLAYING'}]}),
-    'GET /api/library/games-count': json(200, {count: 1, hasSteamId: true}),
+    'GET /api/library/games-count': json(200, {count: 1, hasSteamId: true, canSync: true}),
     'GET /api/library/backlog': json(200, {games: [{appid: 7, name: 'Hades'}]}),
     'GET /api/library/achievements/summary': json(200, {unlocked: 24, startedGames: 4, perfectGames: 2,
         averageCompletion: 71.3, pendingGames: 0, hiddenGames: 0, closest: []}),
@@ -81,6 +81,22 @@ describe('Dashboard', () => {
     });
 
     const order = (container) => [...container.querySelectorAll('[data-tile]')].map((el) => el.dataset.tile);
+    const asked = (path) => fetch.mock.calls.some(([url]) => url.includes(path));
+
+    it('asks for the library before /me answers', async () => {
+        let answerMe;
+        const meAnswer = new Promise((resolve) => { answerMe = resolve; });
+        const routes = dashboardRoutes();
+        const me = routes['GET /api/users/me'];
+        fetchRoutes({...routes, 'GET /api/users/me': () => meAnswer});
+        const container = renderDashboard().container;
+
+        await waitFor(() => expect(asked('/api/library/games')).toBe(true));
+        expect(asked('/api/library/summary')).toBe(true);
+
+        answerMe(me);
+        await waitFor(() => expect(container.querySelector(`img[src="${avatar}"]`)).not.toBeNull());
+    });
 
     it('shows today\'s tiles without a saved layout', async () => {
         const container = mockDashboard();
@@ -227,20 +243,28 @@ describe('Dashboard', () => {
     it('watches the sync the server started for this visit', async () => {
         fetchRoutes({
             ...dashboardRoutes(),
-            'GET /api/library/games-count': json(200, {count: 1, hasSteamId: true, syncStarted: true}),
+            'GET /api/library/games-count': json(200, {count: 1, hasSteamId: true, canSync: true, syncStarted: true}),
         });
         renderDashboard();
 
         await waitFor(() => expect(watchSync).toHaveBeenCalledTimes(1));
     });
 
+    it('loads the activity and the achievements of a Steam user when games-count fails', async () => {
+        fetchRoutes({...dashboardRoutes(), 'GET /api/library/games-count': json(500, {})});
+        renderDashboard();
+
+        expect(await screen.findByText(/DASHBOARD.HELLO/)).toBeTruthy();
+        await waitFor(() => expect(asked('/api/library/activity')).toBe(true));
+        await waitFor(() => expect(asked('/api/library/achievements/summary')).toBe(true));
+    });
+
     describe('of a user with a PlayStation link and no Steam ID', () => {
         const psnOnlyRoutes = (canSync) => ({
             ...dashboardRoutes(),
             'GET /api/users/me': json(200, {email: 'a@b.de', displayName: 'Lobo', settings: {}}),
             'GET /api/library/games-count': json(200, {count: 1, hasSteamId: false, canSync}),
         });
-        const asked = (path) => fetch.mock.calls.some(([url]) => url.includes(path));
 
         it('loads the activity, the achievements and the sync result, but no Steam profile', async () => {
             fetchRoutes(psnOnlyRoutes(true));

src/pages/languageSwitch.test.jsx

@@ -17,7 +17,9 @@ vi.mock('react-i18next', () => import('../test/i18n-mock.js'));
 
 // The last column: what the page loads besides GET /api/users/me of the provider.
 const pages = [
-    ['Dashboard', '/', '/', Dashboard, 'INFO.ERROR.LOAD_PROFILE', []],
+    ['Dashboard', '/', '/', Dashboard, 'INFO.ERROR.LOAD_PROFILE',
+        ['/api/library/games', '/api/library/games-count', '/api/library/backlog', '/api/library/summary',
+            '/api/library/activity', '/api/library/achievements/summary']],
     ['GameDetail', '/games/:appid', '/games/220', GameDetail, 'GAME_DETAIL.ERROR_LOAD', ['/api/library/games/220']],
     ['GameLibrary', '/library', '/library', GameLibrary, 'LIBRARY.ERROR_LOAD',
         ['/api/library/games', '/api/library/games-count', '/api/library/sync-status']],