feat: Phase 1B complete - Perwerde & ValidatorPool UI

Perwerde (Education Platform):
- Add hybrid backend (Supabase + Blockchain + IPFS)
- Implement CourseList, CourseCreator, StudentDashboard
- Create courses table with RLS policies
- Add IPFS upload utility
- Integrate with pallet-perwerde extrinsics

ValidatorPool:
- Add validator pool management UI
- Implement PoolCategorySelector with 3 categories
- Add ValidatorPoolDashboard with pool stats
- Integrate with pallet-validator-pool extrinsics
- Add to StakingDashboard as new tab

Technical:
- Fix all toast imports (sonner)
- Fix IPFS File upload (Blob conversion)
- Fix RLS policies (wallet_address → auth.uid)
- Add error boundaries
- Add loading states

Status: UI complete, blockchain integration pending VPS deployment

shared/lib/ipfs.ts

@@ -0,0 +1,39 @@
+import { toast } from 'sonner';
+
+const PINATA_JWT = import.meta.env.VITE_PINATA_JWT;
+const PINATA_API = 'https://api.pinata.cloud/pinning/pinFileToIPFS';
+
+export async function uploadToIPFS(file: File): Promise<string> {
+  if (!PINATA_JWT || PINATA_JWT === 'your_pinata_jwt_here') {
+    throw new Error('Pinata JWT not configured. Set VITE_PINATA_JWT in .env');
+  }
+
+  const formData = new FormData();
+  formData.append('file', file);
+
+  try {
+    const response = await fetch(PINATA_API, {
+      method: 'POST',
+      headers: {
+        'Authorization': `Bearer ${PINATA_JWT}`,
+      },
+      body: formData,
+    });
+
+    if (!response.ok) {
+      const errorData = await response.json().catch(() => ({}));
+      throw new Error(errorData.error || `Upload failed: ${response.statusText}`);
+    }
+
+    const data = await response.json();
+    return data.IpfsHash; // Returns: Qm...
+  } catch (error) {
+    console.error('IPFS upload error:', error);
+    toast.error('Failed to upload to IPFS');
+    throw error;
+  }
+}
+
+export function getIPFSUrl(hash: string): string {
+  return `https://gateway.pinata.cloud/ipfs/${hash}`;
+}