fix: allow custom Enter keybindings in vi mode

[andrewgazelka]

Summary

• Vi mode now respects custom Enter keybindings instead of hardcoding ReedlineEvent::Enter
• Makes vi mode consistent with emacs mode behavior

Problem

Previously, the Enter key in vi mode was handled before checking custom keybindings:

(_, KeyModifiers::NONE, KeyCode::Enter) => {
    self.mode = ViMode::Insert;
    ReedlineEvent::Enter
}

This meant users could not override Enter behavior in vi_insert or vi_normal modes. Custom keybindings like abbreviation expansion menus would work with Space but not Enter.

Solution

Check keybindings first via find_binding(), fall back to default Enter behavior only if no custom binding exists. This matches how emacs mode already handles Enter.

flowchart TD
    A[Enter key pressed in vi mode] --> B{Custom keybinding exists?}
    B -->|Yes| C[Execute custom binding]
    B -->|No| D[Default: ReedlineEvent::Enter]

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Testing

Tested with nushell's abbreviation expansion menu - Enter now correctly triggers the menu before submitting, matching Space behavior.

Note

Made with claude code.

[andrewgazelka]

@sholderbach @fdncred - Would appreciate a review when you get a chance! This fix is blocking my ability to use nushell with vim-style fish abbreviations. Happy to make any changes needed.