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: []