ｗindows: Only call TranslateMessage when we can't handle the event (#32166)

This PR improves key handling on Windows by moving the
`TranslateMessage` call from the message loop to after we handled
`WM_KEYDOWN`. This brings Windows behavior more in line with macOS and
gives us finer control over key events. As a result, Vim keybindings now
work properly even when an IME is active. The trade-off is that it might
introduce a slight delay in text input.


Release Notes:

- N/A

crates/gpui/src/platform/windows/platform.rs

@@ -231,9 +231,6 @@ impl WindowsPlatform {
                         }
                     }
                     _ => {
-                        // todo(windows)
-                        // crate `windows 0.56` reports true as Err
-                        TranslateMessage(&msg).as_bool();
                         DispatchMessageW(&msg);
                     }
                 }