Open WebCRT New Session setup for LLDP placeholders.

Claim the existing placeholder in place and promote source to webcrt instead of prompting for password-only auth.

Co-authored-by: Cursor <cursoragent@cursor.com>

web/src/i18n/en.ts

@@ -1123,6 +1123,9 @@ const en = {
     },
     newSession: {
       title: "New Session",
+      claimTitle: "Complete LLDP placeholder",
+      claimHint:
+        "Enter a reachable host. Session name defaults to the LLDP placeholder. On success, source becomes WebCRT.",
       connect: "Connect",
       connecting: "Connecting…",
       protocol: "Protocol",