[Lng999]

Closing or restarting Rose while Party Mode was adding a friend left the plugin's panel locked: its close button and Done control stayed unavailable. Losing the connection during enable/disable also left the toggle disabled. Requests made while disconnected were queued and could unexpectedly execute after reconnection.

Track the pending action and restore the controls when the bridge connection closes. Keep the panel open, return the friend's token to its input and show a retry message. User mutations now require an open connection and are never queued; reconnecting requests current state without replaying an action. State confirmation settles a pending enable/disable, while an add remains locked until its reply, disconnection or party mode being disabled. Normal replies still release the controls. The new messages use the existing English translation fallback.

Validation:

• node --test test/party_ui_reconnect.test.cjs: 5 pass; all 5 fail against the base plugin.
• The harness drives the real plugin's click handlers with fake DOM, WebSocket and timers, covering restored tokens/controls, explicit retry, offline refusal and state reconciliation.
• The plugins CI job runs this harness after syntax checks using its existing Node 24 setup. Plugin syntax and git diff --check pass.

Validation does not include a live League client or establish a fix for issue #374.