fix: detect ChatGPT temporary chat state

[Alan-512]

Summary

• Recognize ChatGPT temporary mode from the active Turn off temporary chat toggle label.
• Read conversationId/conversation_id query parameters when the temporary chat route does not expose a normal /c/ path.
• Keep Turn on temporary chat inactive and add lifecycle regression coverage.

Root cause

The exporter only mounted when getActiveConversationId() returned an ID. The active ChatGPT temporary toggle could match the mode text but lacked the state attributes required by the detector, and the temporary conversation ID could remain only in the URL query.

Validation

• node --test tests/content-ui-lifecycle.test.js (15 passed)
• node --check content.js
• node --check inject.js
• node --check tests/content-ui-lifecycle.test.js
• Manifest JSON/resource validation
• git diff --check