Restore Boat desktop input before computer access

Probe IBus without replacing a healthy daemon. Rebind a failed restored socket to the same user private runtime directory before viewer access or Cua MCP startup; headless execution stays independent.

Co-Authored-By: Paperclip <noreply@paperclip.ing>

server/src/modules/computers/application/ports.ts

@@ -53,6 +53,7 @@ export interface ComputerBackend {
     id: string,
   ): Promise<{ id: string; status: string }>;
   renew(record: ComputerRecord): Promise<void>;
+  computerTool(): { command: string; args: string[] };
   desktop(
     record: ComputerRecord,
   ): Promise<{ viewerUrl: string; expiresAt: string }>;

server/src/modules/computers/application/service.test.ts

@@ -63,6 +63,7 @@ function fixture() {
     stop: vi.fn(async () => ({ id: "stop_1", status: stopStatus })),
     stopStatus: vi.fn(async () => ({ id: "stop_1", status: stopStatus })),
     renew: vi.fn(async () => {}),
+    computerTool: () => ({ command: "cua-driver", args: ["mcp"] }),
     desktop: vi.fn(async () => ({
       viewerUrl: "https://test.on.boat.dev/#credential",
       expiresAt: new Date(clock.getTime() + 540_000).toISOString(),

server/src/modules/computers/application/service.ts

@@ -289,6 +289,7 @@ finally:
     return {
       owner: ownerRef,
       runner: runnerFor(false),
+      computerTool: backend.computerTool(),
       process: {
         runner: runnerFor(true),
         async ingress(input?: { port?: number; path?: string }) {