editor: Add active match highlight for buffer and project search (#44098)

Closes #28617

<img width="400" alt="image"
src="https://github.com/user-attachments/assets/b1c2880c-5744-4bed-a687-5c5e7aa7fef5"
/>

Release Notes:

- Improved visibility of the currently active match when browsing
results in buffer or project search.

---------

Co-authored-by: DarkMatter-999 <darkmatter999official@gmail.com>

crates/theme/src/styles/colors.rs

@@ -128,6 +128,7 @@ pub struct ThemeColors {
     pub tab_inactive_background: Hsla,
     pub tab_active_background: Hsla,
     pub search_match_background: Hsla,
+    pub search_active_match_background: Hsla,
     pub panel_background: Hsla,
     pub panel_focused_border: Hsla,
     pub panel_indent_guide: Hsla,
@@ -352,6 +353,7 @@ pub enum ThemeColorField {
     TabInactiveBackground,
     TabActiveBackground,
     SearchMatchBackground,
+    SearchActiveMatchBackground,
     PanelBackground,
     PanelFocusedBorder,
     PanelIndentGuide,
@@ -467,6 +469,7 @@ impl ThemeColors {
             ThemeColorField::TabInactiveBackground => self.tab_inactive_background,
             ThemeColorField::TabActiveBackground => self.tab_active_background,
             ThemeColorField::SearchMatchBackground => self.search_match_background,
+            ThemeColorField::SearchActiveMatchBackground => self.search_active_match_background,
             ThemeColorField::PanelBackground => self.panel_background,
             ThemeColorField::PanelFocusedBorder => self.panel_focused_border,
             ThemeColorField::PanelIndentGuide => self.panel_indent_guide,