ui: Fix Vim mode detection in keybinding to text helpers (#38971)

# Why

Refs:
* #38969

When working on the PR above I have spotted that keybinding to text
helpers incorrectly detects if Vim mode is enabled.

# How

Replace inline check with an existing `KeyBinding::is_vim_mode` method
in keybinding text helpers.

Release Notes:

- Fixed incorrect Vim mode detection in UI keybinding to text helpers.

# Test plan

Made sure that when Vim mode is not specified in settings file it
resolves to `false`, and correct keybindings are displayed, than I have
added the `"vim_mode": true,` line to my settings file and made sure
that keybindings text have changed accordingly.

### Before

<img width="712" height="264" alt="Screenshot 2025-09-26 at 16 57 08"
src="https://github.com/user-attachments/assets/62bc24bd-c335-420f-9c2e-3690031518c1"
/>

### After

<img width="712" height="264" alt="Screenshot 2025-09-26 at 17 13 50"
src="https://github.com/user-attachments/assets/e0088897-eb6b-4d7b-855a-931adcc15fe8"
/>

Author: Simek

crates/ui/src/components/keybinding.rs

@@ -392,7 +392,7 @@ pub fn text_for_action(action: &dyn Action, window: &Window, cx: &App) -> Option
 
 pub fn text_for_keystrokes(keystrokes: &[Keystroke], cx: &App) -> String {
     let platform_style = PlatformStyle::platform();
-    let vim_enabled = cx.try_global::<VimStyle>().is_some();
+    let vim_enabled = KeyBinding::is_vim_mode(cx);
     keystrokes
         .iter()
         .map(|keystroke| {
@@ -408,7 +408,7 @@ pub fn text_for_keystrokes(keystrokes: &[Keystroke], cx: &App) -> String {
 
 pub fn text_for_keybinding_keystrokes(keystrokes: &[KeybindingKeystroke], cx: &App) -> String {
     let platform_style = PlatformStyle::platform();
-    let vim_enabled = cx.try_global::<VimStyle>().is_some();
+    let vim_enabled = KeyBinding::is_vim_mode(cx);
     keystrokes
         .iter()
         .map(|keystroke| {
@@ -424,8 +424,7 @@ pub fn text_for_keybinding_keystrokes(keystrokes: &[KeybindingKeystroke], cx: &A
 
 pub fn text_for_keystroke(modifiers: &Modifiers, key: &str, cx: &App) -> String {
     let platform_style = PlatformStyle::platform();
-    let vim_enabled = cx.try_global::<VimStyle>().is_some();
-    keystroke_text(modifiers, key, platform_style, vim_enabled)
+    keystroke_text(modifiers, key, platform_style, KeyBinding::is_vim_mode(cx))
 }
 
 /// Returns a textual representation of the given [`Keystroke`].