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/components/Header.svelte

@@ -105,14 +105,14 @@
      is unchanged) and centres the title within it, BELOW the notch — lining it up vertically
      with Telegram's own back/menu controls, which sit in the band's corners. */
   :global(html.tg-fullscreen) .bar {
-    min-height: var(--tg-content-top);
+    /* The bar spans the Telegram nav band and then **+20px** past --tg-content-top, so the
+       native controls aren't flush against our content. Without the (removed) hamburger the
+       title alone left the bar sitting right on the band; the extra height restores the gap.
+       padding-top clears the notch; the title centres in the band. (Owner-tunable height.) */
+    min-height: calc(var(--tg-content-top) + 20px);
     box-sizing: border-box;
     align-items: center;
     justify-content: center;
-    /* +12px of vertical breathing room (6 above / 6 below the centred content, on top of the
-       notch) so Telegram's native controls aren't flush against our header. Applied as
-       padding because the bar is sized by its content here, not by min-height (owner review
-       tweaks). */
     padding-top: calc(var(--tg-safe-top) + 6px);
     padding-bottom: 6px;
   }