windows: Fix keystroke & keymap (#36572)

Closes #36300

This PR follows Windows conventions by introducing
`KeybindingKeystroke`, so shortcuts now show up as `ctrl-shift-4`
instead of `ctrl-$`.

It also fixes issues with keyboard layouts: when `use_key_equivalents`
is set to true, keys are remapped based on their virtual key codes. For
example, `ctrl-\` on a standard English layout will be mapped to
`ctrl-ё` on a Russian layout.


Release Notes:

- N/A

---------

Co-authored-by: Kate <kate@zed.dev>

crates/gpui/src/platform/linux/platform.rs

@@ -25,8 +25,8 @@ use xkbcommon::xkb::{self, Keycode, Keysym, State};
 use crate::{
     Action, AnyWindowHandle, BackgroundExecutor, ClipboardItem, CursorStyle, DisplayId,
     ForegroundExecutor, Keymap, LinuxDispatcher, Menu, MenuItem, OwnedMenu, PathPromptOptions,
-    Pixels, Platform, PlatformDisplay, PlatformKeyboardLayout, PlatformTextSystem, PlatformWindow,
-    Point, Result, Task, WindowAppearance, WindowParams, px,
+    Pixels, Platform, PlatformDisplay, PlatformKeyboardLayout, PlatformKeyboardMapper,
+    PlatformTextSystem, PlatformWindow, Point, Result, Task, WindowAppearance, WindowParams, px,
 };
 
 #[cfg(any(feature = "wayland", feature = "x11"))]
@@ -144,6 +144,10 @@ impl<P: LinuxClient + 'static> Platform for P {
         self.keyboard_layout()
     }
 
+    fn keyboard_mapper(&self) -> Rc<dyn PlatformKeyboardMapper> {
+        Rc::new(crate::DummyKeyboardMapper)
+    }
+
     fn on_keyboard_layout_change(&self, callback: Box<dyn FnMut()>) {
         self.with_common(|common| common.callbacks.keyboard_layout_change = Some(callback));
     }