Role-based access control: guards on all critical APIs + redirects

INTEGRATION AUDIT — Fixed all gaps:

1. LOGIN REDIRECT
   - Community leaders → /dashboard/community (not /dashboard)
   - Fetches session after login to check role before redirect
   - Auth0 callback still goes to /dashboard (handled by #2)

2. DASHBOARD HOME REDIRECT
   - If role === community_leader or volunteer → router.replace(/community)
   - Prevents them from seeing the admin home page

3. API ROLE GUARDS (server-side)
   New: src/lib/roles.ts — permission matrix:
   - settings.write: super_admin, org_admin only
   - pledges.write: super_admin, org_admin only (status changes)
   - events.create: super_admin, org_admin only
   - imports.upload: super_admin, org_admin only (bank statements)
   - links.create: super_admin, org_admin, community_leader (they can create)
   - pledges.read: everyone except volunteer
   - dashboard.read: everyone except volunteer

   New: requirePermission() in session.ts
   Applied to:
   - PATCH /api/settings → settings.write
   - PUT /api/settings → settings.write
   - PATCH /api/pledges/[id] → pledges.write
   - POST /api/events → events.create
   - POST /api/imports/bank-statement → imports.upload

   Community leader attempting these gets 403 'Admin access required'

4. LAYOUT NAV (already done in previous commit)
   - community_leader sees: My Community, Share Links, Reports
   - No Money, No Settings, No 'New Appeal' button

WHAT COMMUNITY LEADER CAN DO:
✓ View /dashboard/community (their scoped dashboard)
✓ View /dashboard/collect (share links — they can create new links)
✓ View /dashboard/reports (financial summary)
✓ Create QR sources / links (POST /api/events/[id]/qr)
✓ Read pledges and dashboard data

WHAT COMMUNITY LEADER CANNOT DO:
✗ Change pledge statuses (PATCH /api/pledges/[id] → 403)
✗ Change settings (PATCH/PUT /api/settings → 403)
✗ Create appeals (POST /api/events → 403)
✗ Upload bank statements (POST /api/imports/bank-statement → 403)
✗ Manage team (POST/PATCH/DELETE /api/team → 403, already guarded)
✗ See /dashboard/money, /dashboard/settings (not in nav, home redirects)

pledge-now-pay-later/src/app/(auth)/login/page.tsx

@@ -29,7 +29,18 @@ function LoginForm() {
       setError("Invalid email or password")
       setLoading(false)
     } else {
-      router.push("/dashboard")
+      // Role-aware redirect: community leaders go to their scoped dashboard
+      try {
+        const session = await fetch("/api/auth/session").then(r => r.json())
+        const role = session?.user?.role
+        if (role === "community_leader" || role === "volunteer") {
+          router.push("/dashboard/community")
+        } else {
+          router.push("/dashboard")
+        }
+      } catch {
+        router.push("/dashboard")
+      }
     }
   }