keymap editor: Refine how we display matching keystrokes (#35796)

| Before | After |
|--------|--------|
| <img width="1092" height="528" alt="CleanShot 2025-08-07 at 10  54
42@2x"
src="https://github.com/user-attachments/assets/8b0a3b50-e1d1-4763-824c-2b419df430fc"
/> | <img width="1096" height="580" alt="CleanShot 2025-08-07 at 11  29
47@2x"
src="https://github.com/user-attachments/assets/bd484655-90a6-46fe-91ef-c9c8d2ab93bc"
/> |

Release Notes:

- N/A

crates/settings_ui/src/ui_components/keystroke_input.rs

@@ -529,7 +529,7 @@ impl Render for KeystrokeInput {
             .w_full()
             .flex_1()
             .justify_between()
-            .rounded_lg()
+            .rounded_sm()
             .overflow_hidden()
             .map(|this| {
                 if is_recording {