fix(programmer): move clock ticker watch to dashboard parent

NowWorkingCard was watching clockTickerProvider but received pre-computed
Duration values from ProgrammerDashboard, which never rebuilt on ticks.
Move ref.watch(clockTickerProvider) to ProgrammerDashboard.build() so
the parent rebuilds every 30 s and passes fresh durations to the card.
Remove the now-unused clockTickerProvider watch (and its import) from
NowWorkingCard.

Co-Authored-By: claude-flow <ruv@ruv.net>

lib/screens/programmer_tasks/dashboard/programmer_dashboard.dart

@@ -24,6 +24,9 @@ class ProgrammerDashboard extends ConsumerWidget {
 
   @override
   Widget build(BuildContext context, WidgetRef ref) {
+    // Drive 30-second rebuilds so duration values stay fresh.
+    ref.watch(clockTickerProvider);
+
     final tasksAsync = ref.watch(programmerTasksProvider);
     final runStates = ref.watch(programmerRunStatesProvider);
     final todayKey = ref.watch(todayKeyProvider);