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/markdown_preview/src/markdown_preview_view.rs

@@ -479,7 +479,7 @@ impl Render for MarkdownPreviewView {
         v_flex()
             .id("MarkdownPreview")
             .key_context("MarkdownPreview")
-            .track_focus(&self.focus_handle)
+            .track_focus(&self.focus_handle(cx))
             .size_full()
             .bg(cx.theme().colors().editor_background)
             .p_4()