fix(blink): use builtin kinds when possible

[AbaoFromCUG]

• Folder and File are builtin kind which is supported by blink.cmp, only need kind property for this case
• Custom kind need pass kind_name and kind_icon, e.g. Subagent and 󰚩

[Copilot]

Pull request overview

This PR improves the blink.cmp completion engine integration by properly differentiating between builtin and custom completion item kinds. Previously, all kinds were treated uniformly by setting kind and kind_icon properties. Now, the code checks if a kind (after capitalizing the first letter) exists in blink.cmp's CompletionItemKind enum and uses the appropriate properties accordingly.

Changes:

• Added import of CompletionItemKind from blink.cmp types
• Implemented conditional logic to use kind property for builtin kinds (File, Folder) and kind_name/kind_icon for custom kinds (Command, Context, Subagent)
• Capitalizes the first letter of kind strings to match blink.cmp's enum naming convention

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[sudo-tee]

Thanks for the PR

I am fine wit this change