Option to keep header visible in full-screen terminal mode

Feature Request

When the terminal is in full-screen mode, the Claude Code header (which shows the agent/session name) disappears or becomes hidden. There should be an option to keep it persistently visible.

Current behaviour

• Header with agent name is visible in normal terminal mode
• In full-screen mode, the header is hidden — losing the agent name context

Proposed behaviour

• Add a setting (e.g. persistentHeader: true in settings.json) to keep the header always visible regardless of terminal mode
• Alternatively, ensure the header is always rendered as part of the Claude Code TUI frame

Workaround

The status line at the bottom of the screen remains visible, but it doesn't show the agent/session name by default.

Environment

• macOS (Darwin 25.2.0)
• Claude Code CLI