swarm-ui: a schedules page, one card per scheduled prompt

/schedules lists the controller's scheduled prompts as cards: name as the
title, the agents it fires for, the message, its cadence and next fire.
Edit turns a card into its own form; pause, resume and remove act in place,
and + schedule opens an empty form. The form sends only what changed, so a
rename never moves the fire times, and warns when the start or the repeat
does. Filters reuse the shared card filter bar.

Adds a TextAreaField to the ui kit, and an upcoming mode on RelativeTime so
a next-fire time reads "in 5m". Needs the controller's /api/schedules
routes.

frontend/packages/swarm-ui/src/App.tsx

@@ -8,6 +8,7 @@ import { ComponentsPage } from "./pages/ComponentsPage.js";
 import { JobsPage } from "./pages/JobsPage.js";
 import { HivesPage } from "./pages/HivesPage.js";
 import { IssueReportPage } from "./pages/IssueReportPage.js";
+import { SchedulesPage } from "./pages/schedules/SchedulesPage.js";
 import { Panel } from "./ui/panel/Panel.js";
 
 function NotFound() {
@@ -30,6 +31,7 @@ export function App() {
           component={AgentTerminalPage}
         />
         <Route path="/jobs" component={JobsPage} />
+        <Route path="/schedules" component={SchedulesPage} />
         <Route path="/issues" component={IssueReportPage} />
         <Route path="/components" component={ComponentsPage} />
         <Route component={NotFound} />