feat: add local machine registry foundation

src/client/src/controllers/machineController.ts

@@ -0,0 +1,41 @@
+import { api, type Machine } from "../api";
+import { resetWorkspaceScopedState } from "../appState";
+import type { GetState, SetState, UpdateUrl } from "./types";
+import type { ProjectController } from "./projectController";
+
+export class MachineController {
+  constructor(private readonly getState: GetState, private readonly setState: SetState, private readonly updateUrl: UpdateUrl, private readonly projects: ProjectController) {}
+
+  async loadMachines(routeMachineId?: string): Promise<void> {
+    this.setState({ error: "", isLoadingMachines: true });
+    try {
+      const machines = await api.machines();
+      const selectedMachine = machines.find((machine) => machine.id === (routeMachineId ?? "local")) ?? machines.find((machine) => machine.id === "local") ?? machines[0];
+      this.setState({ machines, selectedMachine });
+    } catch (error) {
+      this.setState({ error: String(error) });
+    } finally {
+      this.setState({ isLoadingMachines: false });
+    }
+  }
+
+  async selectMachine(machine: Machine): Promise<void> {
+    if (this.getState().selectedMachine?.id === machine.id) return;
+    this.setState({
+      selectedMachine: machine,
+      projects: [],
+      workspaces: [],
+      selectedProject: undefined,
+      selectedWorkspace: undefined,
+      selectedSession: undefined,
+      messages: [],
+      messagePageStart: 0,
+      messagePageTotal: 0,
+      status: undefined,
+      activity: undefined,
+      ...resetWorkspaceScopedState(),
+    });
+    this.updateUrl();
+    await this.projects.loadProjects();
+  }
+}