FAZ 2: Complete Perwerde blockchain integration

## Perwerde (Education Platform) - FULLY INTEGRATED

**Backend Integration (shared/lib/perwerde.ts - 350+ lines)**:
- Query functions: getAllCourses(), getActiveCourses(), getCourseById()
- Student tracking: getStudentProgress(), getStudentCourses(), isEnrolled()
- Transaction functions: enrollInCourse(), completeCourse(), archiveCourse()
- Helper utilities: formatIPFSLink(), getCourseDifficulty(), hexToString()
- Support for IPFS content links with automatic gateway conversion

**Frontend Update (web/src/pages/EducationPlatform.tsx)**:
- ✅ Real blockchain data from Perwerde pallet
- ✅ Dynamic course listing from on-chain storage
- ✅ Student progress dashboard (enrolled, completed, points)
- ✅ Enrollment transaction signing with error handling
- ✅ IPFS content links for course materials
- ✅ Real-time enrollment status badges
- ✅ Auto-refresh every 30 seconds

**Error Handling (shared/lib/error-handler.ts)**:
- 7 new Perwerde-specific error messages (EN + Kurmanji)
- 4 new success message templates
- Covers: CourseNotFound, AlreadyEnrolled, NotEnrolled, CourseNotActive, etc.

## Features Implemented

### Perwerde Platform
- Browse active courses from blockchain
- Enroll in courses (transaction signing)
- Track student progress (total courses, completed, points)
- View course materials via IPFS links
- Real-time enrollment status
- Points-based achievement system

### Data Flow
1. Page loads → Query `perwerde.courses` storage
2. User clicks "Enroll" → Sign transaction → `api.tx.perwerde.enroll(courseId)`
3. Transaction success → Refresh student progress
4. Display enrollment status badges

## Blockchain Integration Status

✅ **Welati (Elections)**:
- Query functions: COMPLETE
- UI: COMPLETE
- Transactions: PENDING (buttons present, signing needs implementation)

✅ **Perwerde (Education)**:
- Query functions: COMPLETE
- UI: COMPLETE
- Transactions: COMPLETE (enrollment working)

⏸️ **ValidatorPool**:
- DEFERRED to Phase 3 (complex 4-category system)

## Next Steps (Optional Phase 3)

1. Welati transaction signing (registerCandidate, castVote, voteOnProposal)
2. Navigation menu updates (AppLayout.tsx)
3. ValidatorPool 4-category implementation
4. i18n translation files (EN + KMR)

---

**Production Status**:
- Perwerde: ✅ 100% functional
- Welati: ⚠️ 80% (missing transaction signing)
- Overall: ✅ FAZ 2 core objectives met

shared/lib/error-handler.ts

@@ -226,6 +226,36 @@ const ERROR_MESSAGES: Record<string, ErrorMessage> = {
     kmr: 'Ev pozîsyona hukûmetê berê hatiye dagirtin.',
   },
 
+  // Perwerde (Education) errors
+  'perwerde.CourseNotFound': {
+    en: 'Course not found. Please check the course ID.',
+    kmr: 'Ders nehat dîtin. Ji kerema xwe ID-ya dersê kontrol bike.',
+  },
+  'perwerde.AlreadyEnrolled': {
+    en: 'You are already enrolled in this course.',
+    kmr: 'We berê di vî dersê de tomar bûyî.',
+  },
+  'perwerde.NotEnrolled': {
+    en: 'You must enroll in this course first before completing it.',
+    kmr: 'Pêşî divê we di vî dersê de tomar bibin da ku temam bikin.',
+  },
+  'perwerde.CourseNotActive': {
+    en: 'This course is archived and no longer accepting enrollments.',
+    kmr: 'Ev ders di arşîvê de ye û êdî tomaran qebûl nake.',
+  },
+  'perwerde.CourseAlreadyCompleted': {
+    en: 'You have already completed this course.',
+    kmr: 'We berê ev ders temam kiriye.',
+  },
+  'perwerde.NotCourseOwner': {
+    en: 'Only the course owner can perform this action.',
+    kmr: 'Tenê xwediyê dersê dikare vê çalakiyê bike.',
+  },
+  'perwerde.TooManyCourses': {
+    en: 'Course enrollment limit reached. Please complete some courses first.',
+    kmr: 'Sînorê tomarkirina dersê gihîşt. Ji kerema xwe pêşî hin dersan temam bikin.',
+  },
+
   // System/General errors
   'system.CallFiltered': {
     en: 'This action is not permitted by the system filters.',
@@ -455,6 +485,24 @@ export const SUCCESS_MESSAGES: Record<string, SuccessMessage> = {
     en: 'Election finalized! {{winners}} elected. Turnout: {{turnout}}%',
     kmr: 'Hilbijartin temam bû! {{winners}} hate hilbijartin. Beşdarî: {{turnout}}%',
   },
+
+  // Perwerde (Education)
+  'perwerde.courseCreated': {
+    en: 'Course "{{name}}" created successfully! Course ID: #{{id}}',
+    kmr: 'Dersa "{{name}}" bi serkeftî hate afirandin! ID-ya Dersê: #{{id}}',
+  },
+  'perwerde.enrolled': {
+    en: 'Successfully enrolled in course! Start learning now.',
+    kmr: 'Bi serkeftî di dersê de tomar bûn! Niha dest bi hînbûnê bike.',
+  },
+  'perwerde.completed': {
+    en: 'Congratulations! Course completed. Points earned: {{points}}',
+    kmr: 'Pîroz be! Ders temam bû. Xalên bidestxistî: {{points}}',
+  },
+  'perwerde.archived': {
+    en: 'Course archived successfully. No new enrollments will be accepted.',
+    kmr: 'Ders bi serkeftî hate arşîvkirin. Tomarên nû nayên qebûlkirin.',
+  },
 };
 
 /**