fix(build): remove next-pwa and fix type errors

- Remove unused next-pwa dependency to eliminate workbox/rimraf warnings
- Fix DraftRecord type error by removing invalid updatedAt property
- Fix LLMService.getTeacherResponseStream type by adding optional onIntent callback

src/components/features/journal/draft-sheet.tsx

@@ -42,7 +42,6 @@ export function DraftSheet() {
                 // We should probably save the raw JSON or a formatted textual representation.
                 // Let's save formatted text.
                 createdAt: Date.now(),
-                updatedAt: Date.now(),
                 status: 'completed',
                 completedAt: Date.now(),
                 tags: []

src/services/llm-service.ts

@@ -173,6 +173,7 @@ export class LLMService {
     content: string,
     history: { role: string; content: string }[],
     callbacks: {
+      onIntent?: (intent: import('@/lib/llm/intent-detector').Intent) => void;
       onToken: (token: string) => void;
       onComplete: (fullText: string) => void;
       onError: (error: any) => void;