fix(stats): open game detail pages from stat lists, perfect games clickable

Add perfect games click-through on the dashboard. Remove Steam store
links from game lists. Stat numbers with count 0 are not clickable.
Tests cover the perfect-games click, zero guards, and owner versus
visitor behavior.

src/pages/StatsPage.test.jsx

@@ -113,6 +113,34 @@ describe('StatsPage', () => {
         expect(link.getAttribute('href')).toBe('/library?hideDuplicates=true&status=BACKLOG');
     });
 
+    it('aZeroTileIsNotClickable', async () => {
+        const base = stats();
+        answerStats(json(200, stats({overview: {...base.overview, neverStarted: 0}})));
+        renderPage();
+
+        await screen.findByText('STATS.OVERVIEW.NEVER_STARTED');
+
+        expect(screen.queryByRole('button', {name: /STATS\.OVERVIEW\.NEVER_STARTED/})).toBeNull();
+    });
+
+    it('zeroCountsAreNotClickableInPileHabitsAndStatuses', async () => {
+        const base = stats();
+        answerStats(json(200, stats({
+            overview: {...base.overview, byStatus: {...base.overview.byStatus, DROPPED: 0}},
+            pile: {...base.pile, backlogGames: 0, gamesWithTimeToBeat: 0},
+            habits: {...base.habits, underOneHourGames: 0},
+        })));
+        renderPage();
+
+        await screen.findByText('STATS.PILE.GAMES');
+
+        for (const name of [/STATS\.PILE\.GAMES/, /STATS\.PILE\.NORMAL/, /STATS\.HABITS\.UNDER_ONE_HOUR/, /BACKLOG\.STATUS\.DROPPED: 0/]) {
+            expect(screen.queryByRole('button', {name})).toBeNull();
+            expect(screen.queryByRole('link', {name})).toBeNull();
+        }
+        expect(screen.getByRole('link', {name: 'BACKLOG.STATUS.PLAYING: 3'})).toBeTruthy();
+    });
+
     it('leavesTheMoonTripsAlone', async () => {
         answerStats(json(200, stats()));
         renderPage();