feat(ui): reveal the full board on resign (close history, zoom out)

After the player confirms a resign, close the move-history drawer (portrait;
the landscape dock is unaffected) and zoom the board out if it was magnified,
so the resigned game shows its full final board.

ui/e2e/game.spec.ts

@@ -238,6 +238,30 @@ test('dropping the game ends it and shows the result', async ({ page }) => {
   await expect(page.locator('.status .over')).toBeVisible();
 });
 
+test('resigning reveals the full board: closes the history and zooms out', async ({ page }) => {
+  await openGame(page);
+
+  // Zoom in (double-tap an empty cell), then open the history — the two states the resign
+  // confirmation must clear so the resigned game shows its full board.
+  await page
+    .locator('[data-cell]:not(.filled)')
+    .nth(20)
+    .evaluate((el: HTMLElement) => {
+      el.click();
+      el.click();
+    });
+  await expect(page.locator('.viewport.zoomed')).toBeVisible();
+  await page.locator('.scoreboard').click(); // open the history (the 🏁 lives in its header)
+  await expect(page.locator('.boardwrap.slid')).toBeVisible();
+
+  await page.getByRole('button', { name: 'Drop game' }).click(); // 🏁
+  await page.locator('button.danger').click(); // confirm
+
+  await expect(page.locator('.status .over')).toBeVisible(); // the game ended
+  await expect(page.locator('.history')).toHaveCount(0); // history auto-closed (portrait)
+  await expect(page.locator('.viewport.zoomed')).toHaveCount(0); // board zoomed out
+});
+
 test('a placed tile drags from one board cell to another (relocation)', async ({ page }) => {
   await openGame(page);
   await page.locator('.rack .tile').first().click();