Display case-sensitive keybindings for vim commands (#24322)

This Pull Request tackles the issue outline in #14287 by changing the
way `KeyBinding`s for vim mode are displayed in the command palette.
It's worth pointing out that this whole thing was pretty much
implemented by Conrad Irwin during a pairing session, I just tried to
clean up some other changes introduced for a different issue, while
improving some comments.

Here's a quick list of the changes introduced:

- Update `KeyBinding` with a new `vim_mode` field to determine whether
the keybinding should be displayed in vim mode.
- Update the way `KeyBinding` is rendered, so as to detect if the
keybinding is for vim mode, if it is, only display keys in uppercase if
they require the shift key.
- Introduce a new global state – `VimStyle(bool)` - use to determine
whether `vim_mode` should be enabled or disabled when creating a new
`KeyBinding` struct. This global state is automatically set by the `vim`
crate whenever vim mode is enabled or disabled.
- Since the app's context is now required when building a `KeyBinding` ,
update a lot of callers to correctly pass this context.

And before and after screenshots, for comparison:

| before | after |
|--------|-------|
| <img width="1050" alt="SCR-20250205-tyeq"
src="https://github.com/user-attachments/assets/e577206d-2a3d-4e06-a96f-a98899cc15c0"
/> | <img width="1050" alt="SCR-20250205-tylh"
src="https://github.com/user-attachments/assets/ebbf70a9-e838-4d32-aee5-0ffde94d65fb"
/> |

Closes #14287 

Release Notes:

- Fix rendering of vim commands to preserve case sensitivity

---------

Co-authored-by: Conrad Irwin <conrad.irwin@gmail.com>

crates/ui/src/components/keybinding_hint.rs

@@ -207,10 +207,10 @@ impl RenderOnce for KeybindingHint {
 
 // View this component preview using `workspace: open component-preview`
 impl ComponentPreview for KeybindingHint {
-    fn preview(window: &mut Window, _cx: &App) -> AnyElement {
+    fn preview(window: &mut Window, cx: &App) -> AnyElement {
         let enter_fallback = gpui::KeyBinding::new("enter", menu::Confirm, None);
-        let enter = KeyBinding::for_action(&menu::Confirm, window)
-            .unwrap_or(KeyBinding::new(enter_fallback));
+        let enter = KeyBinding::for_action(&menu::Confirm, window, cx)
+            .unwrap_or(KeyBinding::new(enter_fallback, cx));
 
         v_flex()
             .gap_6()