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/button/ReactionToggleButton.module.css

@@ -12,8 +12,10 @@
 
 @media (max-width: 420px) {
   .reactionPopupMenu {
-    --reaction-button-padding: 8px;
-    --reaction-button-fontsize: 16px;
+    /* 20px glyph + 2×12px padding = a 44px square touch target. Five buttons
+       still fit a ~360px drawer row; previously these were ~32px. */
+    --reaction-button-padding: 12px;
+    --reaction-button-fontsize: 20px;
     --reaction-button-gap: 6px;
   }
 }

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 {

src/grid/OneOnOnePortraitLayout.module.css

@@ -16,7 +16,14 @@ Please see LICENSE in the repository root for full details.
 
 .pip {
   position: absolute;
-  inset: var(--cpd-space-4x);
+  /* Keep the self-view within the safe area (home indicator) and the inline
+     content insets, and clear of the floating footer — matching the
+     reference-correct SpotlightExpandedLayout. A bare 16px inset let the
+     bottom-right self-tile sit under the controls / device chrome on phones. */
+  inset: calc(env(safe-area-inset-top) + var(--cpd-space-4x))
+    var(--content-inset-right)
+    calc(env(safe-area-inset-bottom) + var(--cpd-space-4x))
+    var(--content-inset-left);
 }
 
 .pip[data-size="sm"] {

src/grid/SpotlightLandscapeLayout.module.css

@@ -43,3 +43,17 @@ unconditionally select the container so we can use cq units */
   inline-size: 180px;
   block-size: 135px;
 }
+
+/* On a landscape phone the fixed 180px filmstrip rail squeezes the spotlight to
+   a sliver; shrink the rail (keeping the 4:3 tile ratio) to give the spotlight
+   room. Desktop landscape (height > 400px) is unaffected. */
+@media (max-height: 400px) {
+  .layer {
+    --grid-slot-width: 132px;
+  }
+
+  .grid > .slot {
+    inline-size: 132px;
+    block-size: 99px;
+  }
+}

src/tabs/Tabs.module.css

@@ -12,7 +12,12 @@ Please see LICENSE in the repository root for full details.
 }
 
 .tabList {
-  overflow-y: auto;
+  /* The tab row is horizontal, so scroll along the inline axis when the tabs
+     exceed the width (e.g. the Settings modal as a phone drawer). The prior
+     overflow-y:auto expressed the wrong axis; make the horizontal intent
+     explicit and hide the scrollbar. */
+  overflow-x: auto;
+  overflow-y: hidden;
   max-width: 100%;
 
   /*no scrollbars*/
@@ -24,4 +29,5 @@ Please see LICENSE in the repository root for full details.
   /*no scrollbars*/
   background: transparent; /* Chrome/Safari/Webkit */
   width: 0px;
+  height: 0px;
 }

src/tile/GridTile.module.css

@@ -98,6 +98,14 @@ borders don't support gradients */
   color: var(--cpd-color-icon-primary);
 }
 
+/* The camera-flip control is always visible and primarily used on phones;
+   its inherited 4px padding yields a ~28px box, below the touch minimum. */
+@media (hover: none), (pointer: coarse) {
+  .tile .switchCamera {
+    padding: var(--cpd-space-3x);
+  }
+}
+
 @media (hover) {
   .tile .switchCamera:hover {
     background: var(--cpd-color-bg-subtle-secondary);