git: Add cursor pointer on last commit to check changes (#41960)

Release Notes:
-  Improved visual cue on git panel ui to check previous commit changes 

Before: 
<img width="1470" height="956" alt="Screenshot 2025-11-05 at 2 06 49 pm"
src="https://github.com/user-attachments/assets/b8c54bb6-c8b8-4d36-a14f-71d725ed68f2"
/>

After:
<img width="1470" height="956" alt="Screenshot 2025-11-05 at 2 06 24 pm"
src="https://github.com/user-attachments/assets/d8d96f9e-ceed-4c02-9f93-de9fd3dfcbf1"
/>

crates/git_ui/src/git_panel.rs

@@ -3619,7 +3619,7 @@ impl GitPanel {
                 .border_color(cx.theme().colors().border.opacity(0.8))
                 .child(
                     div()
-                        .flex_grow()
+                        .cursor_pointer()
                         .overflow_hidden()
                         .line_clamp(1)
                         .child(