git_ui: Commit modal refinement (#25484)

Closes #ISSUE

Release Notes:

- N/A *or* Added/Fixed/Improved ...

---------

Co-authored-by: Mikayla Maki <mikayla.c.maki@gmail.com>

crates/extensions_ui/src/components/extension_card.rs

@@ -53,10 +53,7 @@ impl RenderOnce for ExtensionCard {
                             .size_full()
                             .items_center()
                             .justify_center()
-                            .bg(theme::color_alpha(
-                                cx.theme().colors().elevated_surface_background,
-                                0.8,
-                            ))
+                            .bg(cx.theme().colors().elevated_surface_background.alpha(0.8))
                             .child(Label::new("Overridden by dev extension.")),
                     )
                 }),