UI: taller tg-fullscreen header + labelled hub tabs

- tg-fullscreen: +20px header height — without the (removed) hamburger the
  title bar lost its bulk and sat flush on Telegram's native nav band.
- Settings/Comms hub tabs gain text labels under the icons (Settings /
  Profile / Friends / Info and Chat / Dictionary); the icon is aria-hidden
  so the label names the button. New i18n keys about.tab, game.dictionary.

ui/e2e/game.spec.ts

@@ -172,7 +172,7 @@ test('check-word sanitises input and shows a verdict', async ({ page }) => {
   await page.locator('.scoreboard').click(); // open the history
   await page.getByRole('button', { name: 'Chat' }).click(); // 💬 -> comms hub
   await expect(page.locator('.pane')).toHaveCount(1);
-  await page.getByRole('button', { name: 'Check word' }).click(); // 🔎 -> dictionary tab
+  await page.getByRole('button', { name: 'Dictionary' }).click(); // 🔎 -> dictionary tab
 
   const input = page.locator('.check input');
   await input.fill('qz9!a'); // digits/punctuation dropped, letters upper-cased
@@ -222,7 +222,7 @@ test('comms hub: chat and dictionary share a screen, back returns to the game',
   await expect(page.locator('.chat')).toBeVisible();
 
   // The Dictionary tab switches in place (same screen, no navigation).
-  await page.getByRole('button', { name: 'Check word' }).click();
+  await page.getByRole('button', { name: 'Dictionary' }).click();
   await expect(page.locator('.check input')).toBeVisible();
 
   // The header back chevron returns to the game.