Hide the mouse when the user is typing in the editor (#25040)

Closes https://github.com/zed-industries/zed/issues/4461

This PR improves the coding experience by hiding the mouse while the
user is typing so it does not accidentally get in their way, making it
challenging to ready characters in the editor.

Release Notes:

- The following PR hides the cursor when the user is typing by adding a
new cursor style called `None`.
- Assuming the user does not move the mouse, it will stay hidden until
it is moved again.


https://github.com/user-attachments/assets/6ba9f2ee-b9f3-4595-81e4-e9d986da4a39

---------

Co-authored-by: Agus <agus@zed.dev>
Co-authored-by: Peter Tripp <peter@zed.dev>
Co-authored-by: Kirill Bulatov <kirill@zed.dev>

crates/gpui_macros/src/styles.rs

@@ -326,6 +326,13 @@ pub fn cursor_style_methods(input: TokenStream) -> TokenStream {
             self.style().mouse_cursor = Some(gpui::CursorStyle::ResizeLeft);
             self
         }
+
+        /// Sets cursor style when hovering over an element to `none`.
+        /// [Docs](https://tailwindcss.com/docs/cursor)
+        #visibility fn cursor_none(mut self, cursor: CursorStyle) -> Self {
+            self.style().mouse_cursor = Some(gpui::CursorStyle::None);
+            self
+        }
     };
 
     output.into()