Claude QoL par lugia19

Adds several QoL tweaks and additional features to Claude.ai. This includes:
- Text search across all chats
- Chat Forking + Compacting
- Search in chat
- Advanced chat navigation
- Advanced editing (Add files to past messages)
- Text to speech (Via Elevenlabs/OAI/Browser)
- TTS with character-based voices
- Speech to text (Via Groq/OAI)
- Preferences switcher
- Per-chat style overrides
- Chat exporting to JSON/TXT and chat importing from TXT

Most of the above features require some form of external API service. The entire extension is built around a Bring Your Own Key principle - that is, you will have to provide your own API key.

The source code is here: https://github.com/lugia19/Claude-QoL