feat: journal dashboard widgets, agent polish, and edit-mode live previews

Journal dashboard widgets and quick-add; rich-text quick-add dialogs.

Dashboard draft sync for live edit previews; assistant bubble + API tools.

Journal UX: stress slider, mood grid, query cap fix.

src/app/api/v1/garden/care-schedules/[id]/calendar/route.ts

@@ -0,0 +1,13 @@
+import { apiJson, withApiHandler } from "@/lib/api-handler";
+import { scheduleOnCalendarForScope } from "@/modules/garden/server/actions";
+import { scheduleOnCalendarInput } from "@/modules/garden/server/schemas";
+
+export async function POST(request: Request, { params }: { params: Promise<{ id: string }> }) {
+  const { id } = await params;
+  return withApiHandler(request, async (scope, req) => {
+    const body: unknown = await req.json();
+    const parsed = scheduleOnCalendarInput.parse({ ...(body as object), scheduleId: id });
+    await scheduleOnCalendarForScope(scope, parsed);
+    return apiJson({ ok: true }, 201);
+  });
+}