UI: fix tg-fullscreen header height via padding-top

min-height was the wrong lever: in Telegram the title is the bar's only
child (the back chevron is hidden), so the bar is sized by padding+content
and min-height (the nav-band height) never binds — the earlier bump did
nothing. Drop the title clear of the native nav band with padding-top
instead (notch + a 20px gap, was +6), and revert the min-height change.

ui/src/components/Header.svelte

@@ -105,15 +105,16 @@
      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 {
-    /* 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);
+    /* The bar is sized by its content + padding — in Telegram the title is the only child (the
+       back chevron is hidden), so min-height (the nav-band height) doesn't bind. Without the
+       (removed) hamburger that content shrank and the bar sat flush under Telegram's native nav
+       band. So **padding-top** is the lever: it drops the title clear of the band — the notch
+       plus a **+20px** gap (was +6). (Owner-tunable: bump the +20px.) */
+    min-height: var(--tg-content-top);
     box-sizing: border-box;
     align-items: center;
     justify-content: center;
-    padding-top: calc(var(--tg-safe-top) + 6px);
+    padding-top: calc(var(--tg-safe-top) + 26px);
     padding-bottom: 6px;
   }
   :global(html.tg-fullscreen) .spacer {