Kiosk start, offline and setup pages in the InfoFlow display style

Dark grey background, name top left, date and clock top right, a flat
panel with a blue top edge. The pages show the kiosk link (token masked)
and the management address; the clock code is shared in kiosk.js.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/voxip_kiosk/agent.py

@@ -29,7 +29,7 @@ from urllib.parse import urlencode, urlsplit
 
 from . import logutil, sysinfo
 from .cdp import CDP, CDPError
-from .config import load_config
+from .config import admin_url, load_config
 from .paths import Paths, load_paths
 from .validation import mask_url
 
@@ -139,6 +139,7 @@ class Agent:
 
     def offline_url(self, config: dict[str, Any], reason: str) -> str:
         return self.local_url("offline", {"name": config["device_name"], "host": urlsplit(config["url"]).hostname or "",
+                                          "url": mask_url(config["url"]), "admin": admin_url(config, self.hostname()),
                                           "reason": reason, "since": int(self.offline_since or self.wall())})
 
     def navigate(self, url: str) -> None: