fix(cis): fix JSX syntax errors and import paths for Phase 3 build

- Fix broken template literal in transcriptionStore.ts export function
- Fix broken regex in Content-Disposition parser
- Fix broken character class in filename sanitization
- Fix LLMConfigModal import path (5 levels up, not 6)
- Export button JSX properly nested in CCTranscriptionPanel
- Build now passes cleanly

src/stores/transcriptionStore.ts

@@ -361,7 +361,7 @@ export const useTranscriptionStore = create<TranscriptionState>((set, get) => ({
 
     try {
       const apiBaseUrl = import.meta.env.VITE_API_BASE || 'https://api.classroomcopilot.ai';
-      const response = await fetch(`${apiBaseUrl}/transcribe/sessions/${sessionId}/export, {
+      const response = await fetch(`${apiBaseUrl}/transcribe/sessions/${sessionId}/export`, {
         method: 'POST',
         headers: {
           'Content-Type': 'application/json',
@@ -378,9 +378,9 @@ export const useTranscriptionStore = create<TranscriptionState>((set, get) => ({
       const disposition = response.headers.get('Content-Disposition');
       let filename = `transcription-export.${format}`;
       if (disposition) {
-        const match = disposition.match(/filename[^;=\n]*=([(["]).*?(\2)|[^;\n]*)/);
+        const match = disposition.match(/filename[*]?=['"\s]*([^;\s]*)/);
         if (match && match[1]) {
-          filename = match[1].replace(/["\'\']/g, '');
+          filename = match[1].replace(/["'\\]/g, '');
         }
       }