Bump dashboards: bar, icon, forecast and clock widget types

Plumbing only: the widget-type literal and its dtype table on both sides,
the regenerated client, a curated lucide map and four stubs the renderers
are wired to. Also a latching switch and a segmented dropdown, both a
`style` on the control that already publishes and reads back, plus the
option editor a dropdown never had.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01HTsT1isxUjw5gtkJk8WhuA

frontend/src/components/Dashboard/BarWidget.tsx

@@ -0,0 +1,6 @@
+import type { WidgetProps } from "./widgets"
+
+/** A bar — a stub until the bar widget is written. */
+export function BarWidget(_props: WidgetProps) {
+  return <p className="text-sm text-muted-foreground">—</p>
+}