feat(08-02): StopwatchWidget with config persistence + reload reconstruction (GREEN)

- stopwatch-widget.tsx: start/stop/reset/lap controls, setInterval tick (100ms)
- Reload reconstruction: Date.now() - startedAt + elapsed (Pitfall 2 fix)
- State persisted via updateWidgetConfig(instanceId, {...}) on each action
- Single interval cleared on unmount and when not running (T-08-04 mitigated)
- Lap times stored newest-first per RESEARCH recommendation
- No CSS modules — Tailwind only (grep -c module.css = 0)
- page.tsx: added wireStopwatchWidget(StopwatchWidget) import + call
- All 7 stopwatch tests pass (GREEN)

apps/web/src/app/(portal)/page.tsx

@@ -5,12 +5,13 @@ import { useTranslations } from 'next-intl';
 import { DashboardGrid } from '@/components/dashboard/dashboard-grid';
 import { EditModeToggle } from '@/components/dashboard/edit-mode-toggle';
 import { WidgetCatalogModal } from '@/components/dashboard/widget-catalog-modal';
-import { wireClockWidget, wireSearchWidget, wireCalendarWidget, wireNoteWidget, wireCalculatorWidget } from '@/components/dashboard/widget-registry';
+import { wireClockWidget, wireSearchWidget, wireCalendarWidget, wireNoteWidget, wireCalculatorWidget, wireStopwatchWidget } from '@/components/dashboard/widget-registry';
 import { ClockWidget } from '@/components/dashboard/widgets/clock-widget';
 import { SearchWidget } from '@/components/dashboard/widgets/search-widget';
 import { CalendarWidget } from '@/components/dashboard/widgets/calendar-widget';
 import { NoteWidget } from '@/components/dashboard/widgets/note-widget';
 import { CalculatorWidget } from '@/components/dashboard/widgets/calculator-widget';
+import { StopwatchWidget } from '@/components/dashboard/widgets/stopwatch-widget';
 import { useDashboardStore } from '@/lib/stores/dashboard-store';
 import type { WidgetType } from '@/components/dashboard/widget-registry';
 
@@ -20,6 +21,7 @@ wireSearchWidget(SearchWidget);
 wireCalendarWidget(CalendarWidget);
 wireNoteWidget(NoteWidget);
 wireCalculatorWidget(CalculatorWidget);
+wireStopwatchWidget(StopwatchWidget);
 
 export default function DashboardPage() {
   const t = useTranslations('widgets');