Fix mouse clicks on remote-open-folder UI (#19851)

Also change Zed's standard style to use
`.track_focus(&self.focus_handle(cx))`, instead of
`.track_focus(&self.focus_handle)`, to catch these kinds of errors more
easily in the future.

Release Notes:

- N/A

---------

Co-authored-by: Conrad <conrad@zed.dev>

crates/diagnostics/src/diagnostics.rs

@@ -101,7 +101,7 @@ impl Render for ProjectDiagnosticsEditor {
         };
 
         div()
-            .track_focus(&self.focus_handle)
+            .track_focus(&self.focus_handle(cx))
             .when(self.path_states.is_empty(), |el| {
                 el.key_context("EmptyPane")
             })