refactor(alerts/ui): replace undefined CSS vars in wizard.module.css

Replace undefined tokens (--muted, --fg, --accent, --border,
--amber-bg) with DS tokens (--text-muted, --text-primary, --amber,
--border-subtle, --space-sm|md). Drop .promoteBanner — replaced by
DS Alert in follow-up commit.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

ui/src/pages/Alerts/RuleEditor/wizard.module.css

@@ -1,31 +1,23 @@
 .wizard {
-  padding: 16px;
+  padding: var(--space-md);
   display: flex;
   flex-direction: column;
-  gap: 16px;
+  gap: var(--space-md);
 }
 
 .header {
   display: flex;
   justify-content: space-between;
   align-items: center;
-  gap: 12px;
+  gap: var(--space-sm);
   flex-wrap: wrap;
 }
 
-.promoteBanner {
-  padding: 8px 12px;
-  background: var(--amber-bg, rgba(255, 180, 0, 0.12));
-  border: 1px solid var(--amber);
-  border-radius: 6px;
-  font-size: 13px;
-}
-
 .steps {
   display: flex;
-  gap: 8px;
+  gap: var(--space-sm);
-  border-bottom: 1px solid var(--border);
+  border-bottom: 1px solid var(--border-subtle);
-  padding-bottom: 8px;
+  padding-bottom: var(--space-sm);
 }
 
 .step {
@@ -34,17 +26,22 @@
   padding: 8px 12px;
   border-bottom: 2px solid transparent;
   cursor: pointer;
-  color: var(--muted);
+  color: var(--text-muted);
   font-size: 13px;
+  font-family: inherit;
+}
+
+.step:hover {
+  color: var(--text-primary);
 }
 
 .stepActive {
-  color: var(--fg);
+  color: var(--text-primary);
-  border-bottom-color: var(--accent);
+  border-bottom-color: var(--amber);
 }
 
 .stepDone {
-  color: var(--fg);
+  color: var(--text-primary);
 }
 
 .stepBody {