Add hover-reveal edit button to widget cards + auto-open edit mode

Each widget card now shows a settings icon in the top-right corner on
hover (desktop) or always-visible (mobile via mobile-touch-target).
Clicking it opens the WidgetConfigDialog directly in edit mode for that
widget (via a new editWidgetId prop on WidgetConfigDialog that
auto-enters the draft-edit path via useEffect).

Wired across all three widget surfaces:
- Dashboard (both mobile section + desktop grid)
- Service OverviewTab
- NamedDashboardPage

128 tests pass; build/lint green.

frontend/src/pages/service-tabs/OverviewTab.tsx

@@ -19,6 +19,7 @@ import type { ServiceInstance } from "../../types";
 export function OverviewTab({ instance }: { instance: ServiceInstance }) {
 	const { data: widgets = [] } = useWidgetInstances(instance.id);
 	const [configOpen, setConfigOpen] = useState(false);
+	const [editWidgetId, setEditWidgetId] = useState<string | undefined>();
 
 	const visibleWidgets = useMemo(
 		() =>
@@ -48,7 +49,7 @@ export function OverviewTab({ instance }: { instance: ServiceInstance }) {
 			{visibleWidgets.length > 0 ? (
 				<div className="grid grid-cols-1 gap-4 md:grid-cols-2">
 					{visibleWidgets.map((widget) => (
-						<WidgetInstanceCard key={widget.id} widget={widget} />
+						<WidgetInstanceCard key={widget.id} widget={widget} onEdit={(id) => { setEditWidgetId(id); setConfigOpen(true); }} />
 					))}
 				</div>
 			) : (
@@ -71,8 +72,9 @@ export function OverviewTab({ instance }: { instance: ServiceInstance }) {
 
 			<WidgetConfigDialog
 				open={configOpen}
-				onClose={() => setConfigOpen(false)}
+				onClose={() => { setConfigOpen(false); setEditWidgetId(undefined); }}
 				serviceId={instance.id}
+				editWidgetId={editWidgetId}
 			/>
 		</div>
 	);