fix: improve color contrast of editor find in dark mode (#2248)

User reported editor find contrast in dark mode was bad. Changed color
for semantic editor highlight in dark mode to an orange similar to what
monokai uses for find in vs code. Confirmed existing color in light mode
was fine.

Before:

![image](https://github.com/user-attachments/assets/6253e838-ad85-4491-82a4-6c7d865cb0a2)

After:

![image](https://github.com/user-attachments/assets/b9630774-f2f9-4c30-8c71-07d4fcb2abc7)

packages/components/src/theme/theme-dark/theme-dark-semantic-editor.css

@@ -59,8 +59,10 @@
   /* Find */
   --dh-color-editor-find-bg: var(--dh-color-gray-200);
   --dh-color-editor-find-match-bg: var(--dh-color-highlight-selected);
-  --dh-color-editor-find-match-highlight-bg: var(
-    --dh-color-highlight-selected-hover
+  --dh-color-editor-find-match-highlight-bg: color-mix(
+    in srgb,
+    var(--dh-color-orange-800) 35%,
+    transparent
   );
   --dh-color-editor-find-option-active-bg: var(--dh-color-accent-700);
   --dh-color-editor-find-option-active-fg: var(--dh-color-gray-900);