Remove redundant styles

Previously we were hiding the entire app bar on mobile phones in landscape orientation. However now that the app bar supports a small 'subtitle' element, we should show only the subtitle in this case to match the designs.

The subtitle still hides on tap, just like the footer.

src/AppBar.module.css

@@ -67,6 +67,29 @@
     "subtitle subtitle subtitle";
 }
 
+/* Hide everything but the subtitle in small windows */
+@media (max-height: 450px) {
+  .bar {
+    display: none;
+  }
+
+  .bar:has(.subtitle) {
+    display: initial;
+
+    .title,
+    .primaryButton,
+    .secondaryButton {
+      display: none;
+    }
+
+    > header {
+      grid-template-columns: 1fr;
+      grid-template-rows: var(--cpd-space-5x) minmax(var(--cpd-space-5x), auto);
+      grid-template-areas: "." "subtitle";
+    }
+  }
+}
+
 .primaryButton {
   grid-area: primaryButton;
   justify-self: start;
@@ -141,4 +164,16 @@ body[data-platform="ios"] {
       display: none;
     }
   }
+
+  /* Hide everything but the subtitle in small windows */
+  @media (max-height: 450px) {
+    .bar:has(.subtitle) > header {
+      grid-template-rows: var(--cpd-space-4x) minmax(var(--cpd-space-5x), auto);
+      grid-template-areas: "." "subtitle";
+    }
+
+    .subtitle {
+      color: var(--cpd-color-text-primary);
+    }
+  }
 }

src/state/CallViewModel/CallViewModel.ts

@@ -1424,7 +1424,7 @@ export function createCallViewModel$(
     windowMode$.pipe(
       switchMap((mode) => {
         // In small windows the header would be too obstructive
-        if (mode === "pip" || mode === "flat") return of(false);
+        if (mode === "pip") return of(false);
         // In edge-to-edge layouts, couple the visibility of the header
         // to that of the footer
         return edgeToEdge$.pipe(