refactor(scenario): remove step type and simplify scheduler to exec-only

- remove StepType, type column, and type field from step entity and DTOs
- remove executeLoginStep, executeSignStep, executeExecStep from scheduler
- inline exec logic directly in executeStepRun; all steps run execCode
- remove AuthService, EnvironmentService, runEnvironments from scheduler
- remove type selector from CreateStepPage and EditStepPage
- remove type badge column from ScenarioDetailPage
- fix useEffect dependency arrays in RunDetailPage (FINAL, id, runId, polling)
- fix duplicate /snippets proxy key in vite.config.ts
- remove unused escapeHtml export from hljs.ts

client/src/ui/AutoRefreshIndicator/AutoRefreshIndicator.tsx

@@ -6,7 +6,11 @@ export interface AutoRefreshIndicatorProps {
   label?: string;
 }
 
-export function AutoRefreshIndicator({ active, pulseKey, label = 'Live' }: AutoRefreshIndicatorProps) {
+export function AutoRefreshIndicator({
+  active,
+  pulseKey,
+  label = 'Live',
+}: AutoRefreshIndicatorProps) {
   return (
     <div
       className={[styles.root, active ? styles.active : styles.inactive].join(' ')}
@@ -15,9 +19,7 @@ export function AutoRefreshIndicator({ active, pulseKey, label = 'Live' }: AutoR
       aria-live="polite"
     >
       <span className={styles.dot}>
-        {pulseKey !== undefined && pulseKey > 0 && (
-          <span key={pulseKey} className={styles.ring} />
-        )}
+        {pulseKey !== undefined && pulseKey > 0 && <span key={pulseKey} className={styles.ring} />}
       </span>
       <span className={styles.label}>{label}</span>
     </div>