Unified conversation history view across working directories

Currently, conversation logs are bucketed by the working directory Claude Code was launched from (~/.claude/projects/<encoded-path>/). Users who work across multiple repos end up with fragmented history that's hard to browse — you need to know the session ID in advance to --resume a conversation started in a different directory.

Request: A unified conversation history view (e.g. claude --history or within the interactive session menu) that shows all sessions regardless of which project directory they belong to, with optional filtering by project path.

Workaround today: claude --resume <id> works across directories if you know the ID, but discovery is the problem.