gpui: Improve window.prompt to support ESC with non-English cancel text on macOS (#29538)

Release Notes:

- N/A

----

The before version GPUI used `Cancel` for cancel text, if we use
non-English text (e.g.: "取消" in Chinese), then the press `Esc` to cancel
will not work.

So this PR to change it by use `PromptButton` to instead the `&str`,
then we can use `PromptButton::cancel("取消")` for the `Cancel` button.

Run `cargo run -p gpui --example window` to test.

---

Platform Test:

- [x] macOS
- [x] Windows
- [x] Linux (x11 and Wayland)

---------

Co-authored-by: Mikayla Maki <mikayla@zed.dev>
Co-authored-by: Mikayla Maki <mikayla.c.maki@gmail.com>

crates/gpui/src/app/async_context.rs

@@ -1,7 +1,7 @@
 use crate::{
     AnyView, AnyWindowHandle, App, AppCell, AppContext, BackgroundExecutor, BorrowAppContext,
-    Entity, EventEmitter, Focusable, ForegroundExecutor, Global, PromptLevel, Render, Reservation,
-    Result, Subscription, Task, VisualContext, Window, WindowHandle,
+    Entity, EventEmitter, Focusable, ForegroundExecutor, Global, PromptButton, PromptLevel, Render,
+    Reservation, Result, Subscription, Task, VisualContext, Window, WindowHandle,
 };
 use anyhow::Context as _;
 use derive_more::{Deref, DerefMut};
@@ -314,13 +314,16 @@ impl AsyncWindowContext {
     /// Present a platform dialog.
     /// The provided message will be presented, along with buttons for each answer.
     /// When a button is clicked, the returned Receiver will receive the index of the clicked button.
-    pub fn prompt(
+    pub fn prompt<T>(
         &mut self,
         level: PromptLevel,
         message: &str,
         detail: Option<&str>,
-        answers: &[&str],
-    ) -> oneshot::Receiver<usize> {
+        answers: &[T],
+    ) -> oneshot::Receiver<usize>
+    where
+        T: Clone + Into<PromptButton>,
+    {
         self.window
             .update(self, |_, window, cx| {
                 window.prompt(level, message, detail, answers, cx)