fix(profiles): label a Plex Home parent connection as an account

A Plex Home profile's chip rendered the parent connection's displayLabel,
which for a Plex account is the account owner's username. The owner's name
appeared directly beneath the Home user's own, reading as the wrong user
being signed in.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Fdzda9t7kQtq7LoQ2v5nVF

lib/i18n/en.i18n.json

@@ -763,6 +763,7 @@
     "deleteThisProfileTitle": "Delete this profile?",
     "deleteThisProfileMessage": "Remove ${displayName}. Connections aren't affected.",
     "active": "Active",
+    "viaPlexAccount": "via ${name}",
     "manage": "Manage",
     "delete": "Delete",
     "signOut": "Sign out",