feat: Sprint 14 — Marketing & Monetization

- Landing page with hero, feature grid, trust signals
- Split-layout login redesign (admin + portal)
- Pricing page with storage tiers (5GB/50GB/unlimited)
- StorageQuotaService backend (V36 migration, 402 on exceeded)
- Frontend storage integration + 402 error handling
- StorageController uses TenantContext for tenant isolation
- onTierChange() hook for subscription tier updates

cannamanage-frontend/src/services/documents.ts

@@ -73,7 +73,19 @@ export async function uploadDocument(
       body: formData,
     }
   )
-  if (!res.ok) throw new Error("Upload failed")
+  if (!res.ok) {
+    if (res.status === 402) {
+      const problem = await res.json()
+      const error = new Error("Storage quota exceeded") as Error & {
+        status: number
+        problemDetail: unknown
+      }
+      error.status = 402
+      error.problemDetail = problem
+      throw error
+    }
+    throw new Error("Upload failed")
+  }
   return res.json()
 }