fix: do not replace text when tab with empty candidates

[ynqa]

No description provided.

[Copilot]

Pull request overview

This PR prevents the query editor text from being replaced/cleared when the completion list has no candidates (notably when Tab is used for “down” navigation), and improves the “no suggestions” flow by returning focus to the query editor.

Changes:

• Short-circuit completion navigation events when the listbox is empty to avoid selecting/replacing with an invalid item.
• When entering completion yields zero matches, show the “no suggestion found” guide message, switch focus back to the query editor, and clear the completion session state.
• Simplify the toml dependency version spec in Cargo.toml.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
src/completion.rs	Avoids selection/replacement from an empty completion list; restores editor focus and clears completion state when no suggestions exist.
Cargo.toml	Updates the toml dependency version requirement string.

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