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/src/lib/i18n/en.ts

@@ -65,6 +65,7 @@ export const en = {
   'game.hint': 'Hint',
   'game.chat': 'Chat',
   'game.checkWord': 'Check word',
+  'game.dictionary': 'Dictionary',
   'game.dropGame': 'Drop game',
   'game.preview': 'Scores {n}',
   'game.previewIllegal': 'Not a legal move',
@@ -149,6 +150,7 @@ export const en = {
   'settings.reduceMotion': 'Reduce motion',
 
   'about.title': 'About',
+  'about.tab': 'Info',
   'about.description': 'A multiplatform Scrabble game.',
   'about.version': 'Version {v}',