feat: add dark mode styling for combat values

scss/components/actor/_combat_value.scss

@@ -71,3 +71,13 @@
     flex: 1 1 4em;
   }
 }
+
+// Dark mode filter for combat value backgrounds when in dark theme
+.theme-dark .ds4-combat-value__value {
+  filter: invert(1);
+
+  // Counter-invert the text to keep it normal
+  .ds4-combat-value__text {
+    filter: invert(1);
+  }
+}

templates/sheets/actor/components/combat-value.hbs

@@ -17,7 +17,7 @@ SPDX-License-Identifier: MIT
 <div class="ds4-combat-value">
     <div class="ds4-combat-value__value ds4-combat-value__value--{{combat-value-key}}"
         title="{{combat-value-title}}: {{combat-value-data.tooltip}}">
-        {{combat-value-data.total}}
+        <span class="ds4-combat-value__text">{{combat-value-data.total}}</span>
     </div>
     <span title="{{combat-value-title}}" class="ds4-combat-value__label">{{combat-value-label}}</span>
     <div class="ds4-combat-value__formula">