feat: improve AI chat utilities and types

- Enhance useChat hook
- Improve AI chat utilities
- Update AI types

frontend-modern/src/components/AI/Chat/hooks/useChat.ts

@@ -86,6 +86,16 @@ export function useChat(options: UseChatOptions = {}) {
   };
 
   // Process stream events
+  const extractText = (value: unknown): string => {
+    if (typeof value === 'string') return value;
+    if (value && typeof value === 'object') {
+      const record = value as Record<string, unknown>;
+      if (typeof record.text === 'string') return record.text;
+      if (typeof record.content === 'string') return record.content;
+    }
+    return '';
+  };
+
   const processEvent = (
     assistantId: string,
     event: StreamEvent
@@ -97,7 +107,7 @@ export function useChat(options: UseChatOptions = {}) {
         try {
         switch (event.type) {
           case 'content': {
-            const content = event.data as string;
+            const content = extractText(event.data);
             if (!content) return msg;
             const existing = msg.content || '';
             // Add to streamEvents for chronological display
@@ -109,7 +119,7 @@ export function useChat(options: UseChatOptions = {}) {
           }
 
           case 'thinking': {
-            const thinking = event.data as string;
+            const thinking = extractText(event.data);
             if (!thinking) return msg;
             // Add thinking to streamEvents
             const updated = addStreamEvent(msg, { type: 'thinking', thinking });

frontend-modern/src/components/AI/aiChatUtils.ts

@@ -66,12 +66,28 @@ const configureDOMPurify = () => {
   });
 };
 
+const coerceMarkdownInput = (content: unknown): string => {
+  if (typeof content === 'string') return content;
+  if (content && typeof content === 'object') {
+    const record = content as Record<string, unknown>;
+    if (typeof record.text === 'string') return record.text;
+    if (typeof record.content === 'string') return record.content;
+    try {
+      return JSON.stringify(content);
+    } catch {
+      return String(content);
+    }
+  }
+  return content == null ? '' : String(content);
+};
+
 // Helper to render markdown safely with XSS protection
 // LLM output should NEVER be trusted - always sanitize before rendering as HTML
-export const renderMarkdown = (content: string): string => {
+export const renderMarkdown = (content: unknown): string => {
+  const normalized = coerceMarkdownInput(content);
   try {
     configureDOMPurify();
-    const rawHtml = marked.parse(content) as string;
+    const rawHtml = marked.parse(normalized) as string;
     // Sanitize to prevent XSS from malicious LLM output or injected content
     return DOMPurify.sanitize(rawHtml, {
       // Allow common formatting tags but block scripts, iframes, etc.
@@ -84,7 +100,7 @@ export const renderMarkdown = (content: string): string => {
     });
   } catch {
     // If parsing fails, escape HTML entities as fallback
-    return content.replace(/[&<>"']/g, (char) => {
+    return normalized.replace(/[&<>"']/g, (char) => {
       const entities: Record<string, string> = { '&': '&amp;', '<': '&lt;', '>': '&gt;', '"': '&quot;', "'": '&#39;' };
       return entities[char];
     });

frontend-modern/src/types/ai.ts

@@ -49,7 +49,7 @@ export interface AISettings {
   request_timeout_seconds?: number;
 
   // Infrastructure control settings
-  control_level?: 'read_only' | 'suggest' | 'controlled' | 'autonomous';
+  control_level?: 'read_only' | 'controlled' | 'autonomous';
   protected_guests?: string[];
 }
 
@@ -92,7 +92,7 @@ export interface AISettingsUpdateRequest {
   request_timeout_seconds?: number;
 
   // Infrastructure control settings
-  control_level?: 'read_only' | 'suggest' | 'controlled' | 'autonomous';
+  control_level?: 'read_only' | 'controlled' | 'autonomous';
   protected_guests?: string[];
 }