[Glitch] Fix issues in new theme tokens

Port 59e48657cf to glitch-soc

Signed-off-by: Claire <claire.github-309c@sitedethib.com>

app/javascript/flavours/glitch/styles_new/mastodon/admin.scss

@@ -122,7 +122,11 @@ $content-width: 840px;
         align-items: center;
         gap: 6px;
         padding: 15px;
-        color: var(--color-text-secondary);
+        color: color-mix(
+          in oklab,
+          var(--color-text-primary),
+          var(--color-text-secondary)
+        );
         text-decoration: none;
         transition: all 200ms linear;
         transition-property: color, background-color;

app/javascript/flavours/glitch/styles_new/mastodon/components.scss

@@ -4582,7 +4582,7 @@ a.status-card {
       z-index: 1;
       background: radial-gradient(
         ellipse,
-        rgb(from var(--color-bg-brand-softer-base) r g b / 23%) 0%,
+        rgb(from var(--color-bg-brand-base) r g b / 23%) 0%,
         transparent 60%
       );
     }

app/javascript/flavours/glitch/styles_new/mastodon/css_variables.scss

@@ -79,7 +79,7 @@
 
   // Utility
   --color-bg-ambient: var(--color-bg-primary);
-  --color-bg-elevated: var(--color-grey-800);
+  --color-bg-elevated: var(--color-bg-primary);
   --color-bg-inverted: var(--color-grey-50);
   --color-bg-media-base: var(--color-black);
   --color-bg-media-strength: 65%;
@@ -87,7 +87,7 @@
       var(--color-bg-media-base),
       var(--color-bg-media-strength)
     )};
-  --color-bg-overlay: var(--color-bg-primary);
+  --color-bg-overlay: var(--color-black);
   --color-bg-disabled: var(--color-grey-700);
 
   // Brand