Add /rename command for session renaming with Ctrl+R shortcut

[IgorOhrimenko]

What would you like to be added?

Add a /rename slash command to allow users to rename the current session in both CLI and IDE interfaces. Additionally, support a Ctrl+R keyboard shortcut to quickly rename the session via an inline input dialog.

Proposed behavior:

• /rename — Opens an input dialog (in CLI) or text field (in IDE) to rename the current session. The new name should be displayed in the /resume conversation picker instead of (or alongside) the session UUID, making it easier to identify and find past sessions.
• Ctrl+R — A quick keyboard shortcut that triggers the same rename dialog, providing a faster workflow for users who prefer keyboard navigation.

Why is this needed?

Currently, sessions are identified only by their UUID or the initial prompt message in the /resume conversation picker. This makes it difficult to:

• Organize multiple parallel sessions on different topics
• Quickly identify a specific past conversation when resuming work
• Maintain a clean and understandable session history

Other AI coding agents (e.g., Claude Code) already have session rename functionality, and this is considered a basic usability feature for managing multiple conversations.

Note

This is the CLI/terminal equivalent of the VS Code session rename request in #2619. Please consider linking these issues as related.

Additional context

• Session data is stored in ~/.qwen/projects/<sanitized-cwd>/chats/<session-uuid>.jsonl
• The rename should update metadata in the session file to persist the custom name
• The /resume picker should display the custom name prominently