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/pay-card-contract.test.cjs

@@ -46,7 +46,7 @@ test('paid article and sidebar widget use the Zibll purchase-card DOM', () => {
   assert.match(pay, /支付金额/);
   assert.match(pay, /hidden-box show/);
   assert.match(widget, /'layout' => 'widget'/);
-  assert.match(shell, /'post_pay', 'posts', 'oneline_posts'/);
+  assert.match(shell, /'post_pay', 'oneline_posts', 'hot_posts'/);
   assert.doesNotMatch(single, /aksrt-panel pay-box pay-type-download/);
   assert.doesNotMatch(single, /get_template_part\('templates\/parts\/resource-download-box'\)/);
   assert.match(single, /aksrt_get_paid_box_html\(\$post\)/);