fix(shell): enhance shell completion navigation and tab handling

[Grin1024]

Description:

This PR improves the interactive shell experience ( src/kimi_cli/ui/shell/prompt.py ) by refining how completions are navigated and accepted.

Changes:

1. Tab Key Behavior :

   • Added a specific listener for the Tab key when completions are active.
   • Effect : Pressing Tab now accepts the selected completion (or the first one if none is selected) and immediately appends a space . This removes the friction of manually typing a space after autocompleting commands like /review or /help .

2. Menu Navigation (Up/Down) :

   • Overrode the default Up and Down key bindings when the completion menu is visible.
   • Effect : These keys now only change the selection index in the dropdown menu without updating the text in the input buffer. This allows users to browse through fuzzy-matched options without losing their partially typed keyword/filter.
     Impact:

• Better UX : Users can type /rev -> Tab -> arguments seamlessly.
• Non-destructive Navigation : Browsing the list no longer destroys the user's typed context.

Related Issue

Resolve #751

Description

Checklist

• I have read the CONTRIBUTING document.
• I have linked the related issue, if any.
• I have added tests that prove my fix is effective or that my feature works.
• I have run make gen-changelog to update the changelog.
• I have run make gen-docs to update the user documentation.

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[devin-ai-integration]

✅ Devin Review: No Issues Found

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