fix: Dice So Nice import v14 compat, override Foundry text colors for readability

- hooks.mjs: replace static dice-so-nice import with dynamic import
  using game.modules.get('dice-so-nice').id (path removed in v14)
- hooks.mjs: fix permission condition (|| -> &&), jQuery -> vanilla JS
- less/base.less: override --color-text-* and --button-text-color
  for both .themed.theme-dark (AppV2) and body.theme-dark (legacy apps)
- target #settings-config buttons + labels + hints for dark grays

templates/actor/actor-npc-sheet.hbs

@@ -205,11 +205,11 @@
         <select name="system.skill_categories.preferred" data-dtype="String">
           <option value="">{{ localize 'NONE' }}</option>
           {{#each system.skill_categories as |category key|}}
-            {{#unless key "eq" "preferred"}}
+            {{#ife key "preferred"}}{{else}}
               <option value="{{key}}" {{#ife key ../system.skill_categories.preferred}}selected{{/ife}}>
                 {{localize category.label}}
               </option>
-            {{/unless}}
+            {{/ife}}
           {{/each}}
         </select>
       </div>