fix(lotus): in-call mobile UI fixes (EC audit wave-2)

3-agent survey of the in-call UI at phone width + 2-agent review of the
staged diff. All changes are mobile-gated CSS (mobile-first @media on
Compound tokens), so desktop rendering is provably unchanged.

- CallFooter: wrap the control row and tighten gap/padding at <=500px so
  the buttons (incl. the destructive hangup) can never be clipped by the
  grid's overflow-x:hidden. A loudspeaker button was added to the bar
  without a shed rule, pushing 6-7 lg buttons past the viewport at
  320-500px.
- OneOnOnePortraitLayout: give the 1:1 self-view the same safe-area-aware
  inset as SpotlightExpandedLayout so it clears the home indicator /
  floating footer (was a bare 16px inset). Phone-only layout.
- GridTile: enlarge the always-visible camera-flip control to a 44px touch
  target on coarse pointers (was ~28px).
- ReactionToggleButton: enlarge reaction-picker emoji buttons to 44px at
  <=420px (were ~32px); five still fit a 360px drawer row.
- Tabs: scroll the horizontal tab row on the inline axis (overflow-x) so
  the Settings tabs don't clip in a phone drawer.
- SpotlightLandscapeLayout: shrink the 180px filmstrip rail to 132px on
  short landscape phones (max-height:400px) so the spotlight isn't a sliver.

Gates: tsc 0, prettier clean, affected vitest pass. No TS changed.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/components/CallFooter.module.css

@@ -102,6 +102,20 @@ Once we exceed 500 we hide everything except the buttons.
 @media (max-width: 500px) {
   .footer {
     grid-template-areas: "buttons buttons buttons";
+    /* Reclaim horizontal budget so the control row fits on phones. */
+    padding-left: calc(env(safe-area-inset-left) + var(--cpd-space-3x));
+    padding-right: calc(env(safe-area-inset-right) + var(--cpd-space-3x));
+  }
+
+  .buttons {
+    /* Fill the row and wrap instead of overflowing: on the narrowest phones the
+       control set (mic/video/loudspeaker/hangup) exceeds the viewport, and the
+       parent's overflow-x: hidden would otherwise clip the outer buttons —
+       including the destructive hangup. Wrapping keeps every control reachable. */
+    justify-self: stretch;
+    flex-wrap: wrap;
+    justify-content: center;
+    gap: var(--cpd-space-2x);
   }
 
   .settingsOnlyShowNarrow {