feat(programmer): admin monitor tab + drill-down

- Add isStrictAdminProvider (role == 'admin' only)
- Add programmer_tasks_tabs.dart with ProgrammerTasksTab enum,
  programmerTasksTabsFor, parseProgrammerTasksTab, programmerTasksTabLabel
- Make ProgrammerTasksListScreen role-aware via initialTab param and
  programmerTasksTabsFor; admin sees Monitor/Mine/All tabs
- Add MonitorTab with AppStatusSummaryRow + responsive programmer grid
  (1/2/3 cols) + HelpPanel side/bottom
- Add ProgrammerMonitorCard with state pills (Working/Paused/Idle/On leave/Pass slip)
- Add HelpPanel ConsumerStatefulWidget with day stepper and help-edge rows
- Add ProgrammerDrillDownScreen (/programmer-tasks/programmers/:userId);
  non-admins see lock empty view
- Router: pass tab query param; add programmers/:userId before :id route
- Tests: 7/7 pass; analyze: 0 new issues

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

lib/screens/programmer_tasks/programmer_tasks_tabs.dart

@@ -0,0 +1,57 @@
+/// Tab enumeration and helpers for the Programmer Tasks list screen.
+///
+/// This-slice tabs (Task 10):
+///   Admin:      [monitor, mine, all]
+///   Non-admin:  [mine, all]
+///
+/// approvals and daySheets are deferred to later slices.
+enum ProgrammerTasksTab { monitor, approvals, mine, all, daySheets }
+
+/// Returns the ordered tab list for the current role in this slice.
+List<ProgrammerTasksTab> programmerTasksTabsFor({required bool isStrictAdmin}) {
+  if (isStrictAdmin) {
+    return [
+      ProgrammerTasksTab.monitor,
+      ProgrammerTasksTab.mine,
+      ProgrammerTasksTab.all,
+    ];
+  }
+  return [ProgrammerTasksTab.mine, ProgrammerTasksTab.all];
+}
+
+/// Parses a URL query-parameter value to a [ProgrammerTasksTab].
+///
+/// Valid values: 'monitor', 'approvals', 'mine', 'all', 'day-sheets'.
+/// Returns null for unrecognised or null input.
+ProgrammerTasksTab? parseProgrammerTasksTab(String? q) {
+  switch (q) {
+    case 'monitor':
+      return ProgrammerTasksTab.monitor;
+    case 'approvals':
+      return ProgrammerTasksTab.approvals;
+    case 'mine':
+      return ProgrammerTasksTab.mine;
+    case 'all':
+      return ProgrammerTasksTab.all;
+    case 'day-sheets':
+      return ProgrammerTasksTab.daySheets;
+    default:
+      return null;
+  }
+}
+
+/// Human-readable tab label for display in [TabBar].
+String programmerTasksTabLabel(ProgrammerTasksTab t) {
+  switch (t) {
+    case ProgrammerTasksTab.monitor:
+      return 'Monitor';
+    case ProgrammerTasksTab.approvals:
+      return 'Approvals';
+    case ProgrammerTasksTab.mine:
+      return 'Mine';
+    case ProgrammerTasksTab.all:
+      return 'All';
+    case ProgrammerTasksTab.daySheets:
+      return 'Day Sheets';
+  }
+}