swarm-ui/agents: move the split-out agent-page files into pages/agents/

mara, PR review: "make agentspage a subdir now that its split into
sub components". AgentsPage.tsx/.css, AgentCard.tsx/.css,
AgentTypes.ts, and WantedMenu.tsx move as a family into their own
pages/agents/ directory; CreateAgentForm and LinkMatrixAccountForm
stay in pages/ since they aren't part of this split (CreateAgentForm
is still rendered inside AgentsPage's own dialog but is a standalone,
independently-named form, not one of the pieces carved out of the
page itself).

Pure move: relative imports within the new pages/agents/ family are
unchanged (they were always siblings), only the ones reaching back
out to ui/ and the two forms above gained one more '../', plus
App.tsx's route import.

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

@@ -2,7 +2,7 @@
 // page component under `./pages/`; this file just maps paths to them.
 import { Route, Switch } from "wouter-preact";
 import { Shell } from "./shell/Shell.js";
-import { AgentsPage } from "./pages/AgentsPage.js";
+import { AgentsPage } from "./pages/agents/AgentsPage.js";
 import { ComponentsPage } from "./pages/ComponentsPage.js";
 import { JobsPage } from "./pages/JobsPage.js";
 import { HivesPage } from "./pages/HivesPage.js";

frontend/packages/swarm-ui/src/pages/agents/AgentCard.tsx

@@ -14,8 +14,8 @@
 // `onClick` and opening the detail panel.
 import { Badge } from "@hive/shared/badge.js";
 import type { ProblemDetails } from "@hive/shared/api-error.js";
-import { Card } from "../ui/card/Card.js";
-import { RelativeTime } from "../ui/relative-time/RelativeTime.js";
+import { Card } from "../../ui/card/Card.js";
+import { RelativeTime } from "../../ui/relative-time/RelativeTime.js";
 import { FRESHNESS, type AgentRow } from "./AgentTypes.js";
 import { WantedMenu } from "./WantedMenu.js";
 import "./AgentCard.css";

frontend/packages/swarm-ui/src/pages/agents/AgentsPage.tsx

@@ -32,21 +32,21 @@ import { Badge } from "@hive/shared/badge.js";
 import { LinkIcon } from "@hive/shared/icons.js";
 import { AgentCard } from "./AgentCard.js";
 import { FRESHNESS, type AgentRow } from "./AgentTypes.js";
-import { Button } from "../ui/button/Button.js";
-import { ConfirmDialog } from "../ui/confirm-dialog/ConfirmDialog.js";
-import { Dialog } from "../ui/dialog/Dialog.js";
-import { FilterableView } from "../ui/filterable-view/FilterableView.js";
-import { Panel } from "../ui/panel/Panel.js";
-import { RelativeTime } from "../ui/relative-time/RelativeTime.js";
+import { Button } from "../../ui/button/Button.js";
+import { ConfirmDialog } from "../../ui/confirm-dialog/ConfirmDialog.js";
+import { Dialog } from "../../ui/dialog/Dialog.js";
+import { FilterableView } from "../../ui/filterable-view/FilterableView.js";
+import { Panel } from "../../ui/panel/Panel.js";
+import { RelativeTime } from "../../ui/relative-time/RelativeTime.js";
 import {
   RefreshIntervalPicker,
   useRefreshInterval,
   type RefreshIntervalMs,
-} from "../ui/refresh-interval/RefreshInterval.js";
-import { SplitView } from "../ui/split-view/SplitView.js";
-import { type TableColumn } from "../ui/table/Table.js";
-import { CreateAgentForm } from "./CreateAgentForm.js";
-import { LinkMatrixAccountForm } from "./LinkMatrixAccountForm.js";
+} from "../../ui/refresh-interval/RefreshInterval.js";
+import { SplitView } from "../../ui/split-view/SplitView.js";
+import { type TableColumn } from "../../ui/table/Table.js";
+import { CreateAgentForm } from "../CreateAgentForm.js";
+import { LinkMatrixAccountForm } from "../LinkMatrixAccountForm.js";
 import { WantedMenu } from "./WantedMenu.js";
 import "./AgentsPage.css";