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/i18n/resources/en.ts

@@ -1433,9 +1433,21 @@ export const en = {
       loadingOffer: "Loading pairing offer...",
       failedToLoadOffer: "Failed to load pairing offer.",
       relayDisabled: "Relay is not enabled. Enable relay to pair a device.",
+      enableTitle: "Enable relay?",
+      enableDescription:
+        "Relay lets this device connect from anywhere. Pairing traffic is end-to-end encrypted.",
+      relayDocs: "How relay works",
+      relayDocsAccessibility: "Read how Paseo relay works",
+      enableRelay: "Enable relay",
+      enablingRelay: "Enabling...",
+      notNow: "Not now",
+      directConnectionHint:
+        "Without relay, connect directly over TCP, Tailscale, or another VPN. No QR code is created.",
+      updateRequired: "Update the host to enable relay from Paseo Desktop.",
       unavailable: "Pairing offer unavailable.",
       hint: "Scan this QR code with Paseo on your phone, or copy the link below.",
       qrUnavailable: "QR code unavailable.",
+      qrAccessibility: "Pairing QR code",
       retry: "Retry",
       copy: "Copy",
       copied: "Copied",