Make relay opt-in when pairing devices (#2706)

* feat: make relay opt-in for device pairing

* fix(relay): keep pairing state authoritative

* fix(relay): refresh pairing state across transports

* fix(onboard): honor explicit relay opt-out

* fix(relay): surface transport startup failures

* fix(pairing): gate offers for older daemons

* test(cli): rely on real pairing transport coverage

* fix(cli): report live relay without a pid file

* fix(relay): synchronize config during daemon startup

* fix(relay): preserve mutability for ignored overrides

* fix(cli): use reachable daemon for pairing

* fix(app): redirect invalid pair device routes

* fix(pairing): support remote host device pairing

Keep Pair Device host-relative through the existing settings and daemon RPC flow. Route CLI output through an injected adapter so workflow tests do not mutate process globals.

* fix(pairing): validate pairing destinations

Expose the host-relative Pair Device flow on every supported app platform. Reject a reachable daemon whose identity does not match the requested Paseo home before reading or mutating its pairing state.

* fix(pairing): render QR codes across platforms

Generate SVG text without DOM or canvas and render it through the existing cross-platform SVG stack.

* fix(cli): pair from persisted relay state

Allow explicit relay pairing while the daemon is stopped when relay is already enabled in persisted configuration.

packages/app/src/utils/host-routes.test.ts

@@ -246,6 +246,7 @@ describe("global routes", () => {
 describe("host settings section slugs", () => {
   it("keeps current host settings sections", () => {
     expect(normalizeHostSectionSlug("connections")).toBe("connections");
+    expect(normalizeHostSectionSlug("pair-device")).toBe("pair-device");
     expect(normalizeHostSectionSlug("agents")).toBe("agents");
     expect(normalizeHostSectionSlug("workspaces")).toBe("workspaces");
     expect(normalizeHostSectionSlug("projects")).toBe("projects");

packages/app/src/utils/host-routes.ts

@@ -509,6 +509,7 @@ export function isSettingsSectionSlug(value: string): value is SettingsSectionSl
 export const HOST_SECTION_SLUGS = [
   "projects",
   "connections",
+  "pair-device",
   "agents",
   "workspaces",
   "providers",