feat(ui-lvgl): quick panel from the status bar; L2 fixes from rc1

The quick panel, as a phone's: pulled down from the status bar (or a tap
on it). Bluetooth, WiFi, GPS, sound, trail and live share switch at a
tap; Advert opens the advert popup (moved here from the Nodes header);
Lock locks the screen; a brightness slider. Holding a tile opens its
settings. Lock and sun glyphs added to the fonts.

Fixes from rc1 testing on the L2:
- GPS status icon: none when GPS is off (the module kept its last fix
  valid, so it stayed green); grey on, green with a fix. ensureGps()
  turns GPS on before trusting that stale fix.
- Screen wake: the panel wakes dark, a frame is drawn, then the
  backlight fades in -- no white flash. Off fades out first.
- Power off / flat battery: the chip wakes every 30 s to look for USB
  power and starts when plugged in (it slept with no wake source before,
  until the reset button). Plugged in when switched off: stays off until
  re-plugged.
- Message ages in a conversation refresh every 2 s, as on ui-new; the
  message popup keeps its age, repeaters heard and delivery up to date.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

examples/companion_radio/ui-lvgl/UITask.h

@@ -53,6 +53,13 @@ public:
   void homeAppDrop(int from, int to);
   void homeAppToggle(int pos);
   void goHome();                   // the side button: Home's clock page
+  // The quick panel, pulled down from the status bar (QuickPanel.h)
+  void quickPanelBuild();
+  bool quickPanelBegin();
+  void quickPanelClose(bool animate);
+  bool quickPanelOpen() const;
+  void quickPanelRefresh();
+  void quickPanelTile(int t, bool hold);
   void homeFieldSet(int slot, int field);
   void showChats();
   void showContacts();
@@ -240,6 +247,7 @@ public:
   void conversationAction(uint8_t act);
   void conversationNotif(int v);
   void messageMenu(int idx);
+  void messagePopupTick();
   void messageAction(uint8_t act);
   void chatFold(int which);
   void toggleChatFilter(uint8_t which);
@@ -396,6 +404,7 @@ private:
   void refreshNode();
   void buildThread();
   void refreshThread();
+  void refreshThreadAges();
   uint32_t threadSignature() const;
   void buildClock();
   void buildRadio();
@@ -484,6 +493,7 @@ private:
   bool     _asleep = false;
   uint32_t _next_status_ms = 0;
   uint32_t _next_thread_check_ms = 0;
+  uint32_t _next_thread_ages_ms = 0;
   uint32_t _next_trackback_ms = 0;
   uint32_t _next_clock_ms = 0;
   uint8_t  _settings_page = 0;   // settings::Page shown in SCR_SETTINGS_NAV