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>

client/src/ui/CodeBlock/CodeBlock.tsx

@@ -1,5 +1,5 @@
 import { useMemo } from 'react';
-import hljs, { escapeHtml } from '../../lib/hljs';
+import hljs from '../../lib/hljs';
 import styles from './CodeBlock.module.css';
 
 export interface CodeBlockProps {

client/src/ui/CodeEditor/CodeEditor.tsx

@@ -12,13 +12,13 @@ export interface CodeEditorProps {
 
 function useMonacoTheme() {
   const [theme, setTheme] = useState(() =>
-    document.documentElement.getAttribute('data-theme') === 'dark' ? 'vs-dark' : 'vs-light'
+    document.documentElement.getAttribute('data-theme') === 'dark' ? 'vs-dark' : 'vs-light',
   );
 
   useEffect(() => {
     const observer = new MutationObserver(() => {
       setTheme(
-        document.documentElement.getAttribute('data-theme') === 'dark' ? 'vs-dark' : 'vs-light'
+        document.documentElement.getAttribute('data-theme') === 'dark' ? 'vs-dark' : 'vs-light',
       );
     });
     observer.observe(document.documentElement, {
@@ -49,11 +49,7 @@ export function CodeEditor({
 
   return (
     <div
-      className={[
-        styles.wrapper,
-        focused ? styles.focused : '',
-        error ? styles.hasError : '',
-      ]
+      className={[styles.wrapper, focused ? styles.focused : '', error ? styles.hasError : '']
         .filter(Boolean)
         .join(' ')}
       style={{ height }}

client/src/ui/Textarea/Textarea.tsx

@@ -1,8 +1,10 @@
 import React, { useId } from 'react';
 import styles from './Textarea.module.css';
 
-export interface TextareaProps
-  extends Omit<React.TextareaHTMLAttributes<HTMLTextAreaElement>, 'id'> {
+export interface TextareaProps extends Omit<
+  React.TextareaHTMLAttributes<HTMLTextAreaElement>,
+  'id'
+> {
   label?: string;
   hint?: string;
   error?: string;