fix(tests): restore green contract suite

Drop the legacy credits_added message label per the hard-cut rule, switch
three remaining Font Awesome 4 icons to FA5 solid, and align two widget
contracts with the badge rule grouping and renderer list from fc04bf65.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

tests/widget-system/mini-pay-badge-reference.test.cjs

@@ -85,7 +85,7 @@ test('mini badges stay on the correct meta side, disappear with meta and ignore
 
 test('mini badge styles preserve reference padding and VIP aspect ratio across page bundles', () => {
   const widgetCss = read('assets/widgets/frontend.css');
-  const rule = widgetCss.match(/\.widget-tab-post \.item-meta \.meta-pay\s*\{([^}]+)\}/)[1];
+  const rule = widgetCss.match(/\.widget-tab-post \.item-meta \.meta-pay, \.widget-main-post \.item-meta \.meta-pay\s*\{([^}]+)\}/)[1];
   assert.match(rule, /padding:\s*0 4px/);
   assert.match(rule, /cursor:\s*auto/);
   for (const file of ['assets/css/frontend/post-card.css', 'assets/css/build/homepage.css']) {