fix(github): mermaid diagrams (catppuccin#1495)

Author: Covkie

styles/github/catppuccin.user.css

@@ -2,7 +2,7 @@
 @name         GitHub Catppuccin
 @namespace    github.com/catppuccin/userstyles/styles/github
 @homepageURL  https://github.com/catppuccin/userstyles/tree/main/styles/github
-@version      1.8.1
+@version      1.8.2
 @updateURL    https://github.com/catppuccin/userstyles/raw/main/styles/github/catppuccin.user.css
 @supportURL   https://github.com/catppuccin/userstyles/issues?q=is%3Aopen+is%3Aissue+label%3Agithub
 @description  Soothing pastel theme for GitHub
@@ -687,6 +687,16 @@
     --color-btn-counter-bg: @surface2;
     --color-btn-outline-text: @accent-color;
     --color-fg-muted: @subtext1;
+    --button-default-fgColor-rest: @text;
+    --button-default-bgColor-rest: @surface0;
+    --button-default-bgColor-hover: @surface1;
+    --button-default-bgColor-active: @surface2;
+    --button-default-bgColor-selected: @surface2;
+    --button-default-bgColor-disabled: fade(@surface0, 70%);
+    --button-default-borderColor-rest: @surface1;
+    --button-default-borderColor-hover: @surface1;
+    --button-default-borderColor-active: @surface1;
+    --button-default-borderColor-disabled: fade(@surface0, 70%);
 
     #diagram {
       .node rect,
@@ -697,6 +707,11 @@
         fill: fade(@accent-color, 10%);
         stroke: @accent-color;
       }
+        
+      .cluster rect {
+        fill: @surface0;
+        stroke: @surface2;
+      }
 
       .label text,
       span,
@@ -705,14 +720,19 @@
         color: @text;
       }
 
-      .flowchart-link,
+      .flowchart-link {
+        stroke: @subtext0;
+      }
       .marker {
         stroke: @subtext0;
         fill: @subtext0;
       }
 
       .edgeLabel {
         background-color: @crust;
+        p {
+          background-color: @surface2;
+        }
       }
     }