fix(solo): six fixes from the 2026-07-05 UI audit

- locked device: a ringing alarm/timer was invisible — wakeForAlarm() now
  holds the lock wake window for the whole ring, the lock screen draws the
  alert overlay, and a key-dismissed ring falls back to a 5 s glance
- status bar: A / live-share / trail / repeater icons no longer vanish when
  Bluetooth is off (moved outside the isSerialEnabled() gate)
- alert overlay: long text wraps to up to 3 lines inside the box instead of
  overflowing the border (new UITask::renderAlertOverlay, shared with lock)
- MyMesh: force NUL on contact.name copied from an app frame (unterminated
  name could overrun the AdvertPath strcpy)
- clock tools: ring/timer deadline compares now wrap-safe (signed diff),
  matching the trail/loc-share timers
- messages: channel context menu freezes its target channel at open; fav
  toggle no longer retargets the menu when the fav-only filter drops the row

All three solo envs build green (WioTrackerL1 OLED/Eink, GAT562-30S).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

examples/companion_radio/ui-new/UITask.h

@@ -187,6 +187,12 @@ class UITask : public AbstractUITask {
 
   void setCurrScreen(UIScreen* c);
 
+  // Centred alert overlay (the showAlert() box). Wraps long text to up to
+  // three lines inside the box instead of letting it overflow the border.
+  // Shared by the normal render path and the lock screen (so a ringing
+  // alarm's label is visible while locked).
+  void renderAlertOverlay();
+
 public:
 
   UITask(mesh::MainBoard* board, BaseSerialInterface* serial) : AbstractUITask(board, serial), _display(NULL), _sensors(NULL), _node_prefs(NULL), _dash_lpp(200) {
@@ -290,7 +296,10 @@ public:
   uint32_t timerRemainingMs() const {
     if (!_timer_running) return 0;
     uint32_t now = millis();
-    return (now >= _timer_deadline_ms) ? 0 : (_timer_deadline_ms - now);
+    // Signed-difference compare so a deadline that lands past the millis()
+    // rollover (~49.7 days) doesn't read as already elapsed.
+    if ((int32_t)(now - _timer_deadline_ms) >= 0) return 0;
+    return _timer_deadline_ms - now;
   }
   bool isRinging() const { return _ringing; }
   void dismissRing() { stopMelody(); _ringing = false; clearAlert(); }