feat(tui): adapt config list table layout

[wangxingjun778]

Features & Enhancements

• Width-Aware Configuration Table: Introduced _build_config_list_table in CLI slash handlers to dynamically adapt the TUI layout of writable config fields based on terminal width.
• Layout Unit Testing: Added comprehensive unit tests to verify responsive rendering across compact, medium, and full-width terminal sizes.

Bug Fixes (Address Review Feedback)

• Falsy Value Handling in _shorten: Fixed the helper to explicitly check for None so that falsy values like 0 or False are no longer incorrectly treated as empty strings.
• Flexible Type Support in _config_reload_text: Updated the helper to correctly process both boolean and string values (e.g., 'partial') for the hot_reload field instead of strictly casting it to a boolean.

[gemini-code-assist]

Code Review

This pull request introduces a width-aware configuration list table (_build_config_list_table) in the CLI slash handlers to dynamically adapt the TUI rendering of writable config fields based on the terminal width. It also adds corresponding unit tests to verify the layout behavior across compact, medium, and full widths. The review feedback highlights two important issues: first, the _shorten helper incorrectly treats falsy values like 0 or False as empty strings, which should be resolved by explicitly checking for None; second, the _config_reload_text helper incorrectly treats the hot_reload field as a boolean, which fails to preserve string values like 'partial' and should be updated to handle both booleans and strings properly.

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