App 2.16.3: full screen stays with drop-downs and dialogs

Opening a drop-down or a dialog brought the car's bars back until it
closed: each is a window of its own, and the system shows the bars when
a window without the full-screen flags takes focus.

- The drop-downs (upload frequency, tyre pressure unit, accent colour)
  are now single-choice buttons on the page: no extra window, one tap
  instead of two, full touch targets, the choice in the accent colour.
- Dialogs (About, update, pairing, phone settings, trip reset, date
  picker) are shown unfocusable, given the activity's full-screen
  flags, and only then allowed focus. None of them takes typing, which
  an unfocusable window would block.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01QLJfZQZeAKAwSqViTmLzki

app/src/main/res/values/styles_ev.xml

@@ -96,4 +96,20 @@
     <style name="ShapeAppearanceOverlay.EV.Button" parent="">
         <item name="cornerSize">18dp</item>
     </style>
+
+    <!-- On-page single choice (choice_chip.xml): a full touch target, the accent when chosen. -->
+    <style name="Widget.EV.Choice" parent="Widget.Material3.Chip.Filter">
+        <item name="android:checkable">true</item>
+        <item name="checkedIconVisible">false</item>
+        <item name="chipMinHeight">@dimen/touch_target</item>
+        <item name="chipMinTouchTargetSize">@dimen/touch_target</item>
+        <item name="android:textSize">@dimen/text_body</item>
+        <item name="android:textColor">@color/choice_text</item>
+        <item name="chipBackgroundColor">@color/choice_background</item>
+        <item name="chipStrokeColor">@color/choice_stroke</item>
+        <item name="chipStrokeWidth">1dp</item>
+        <item name="chipStartPadding">16dp</item>
+        <item name="chipEndPadding">16dp</item>
+        <item name="ensureMinTouchTargetSize">false</item>
+    </style>
 </resources>