fundraiser mode: external platforms, role-aware onboarding, show-don't-gate

SCHEMA:
- Organization.orgType: 'charity' | 'fundraiser'
- Organization.whatsappConnected: boolean
- Event.paymentMode: 'self' (bank transfer) | 'external' (redirect to URL)
- Event.externalUrl: fundraising page URL
- Event.externalPlatform: launchgood, enthuse, justgiving, gofundme, other

ONBOARDING (role-aware):
- Dashboard shows getting-started banner AT TOP, not full-page blocker
- First-time users see role picker: 'Charity/Mosque' vs 'Personal Fundraiser'
- POST /api/onboarding sets orgType
- Charity checklist: bank details → WhatsApp → create fundraiser → share link
- Fundraiser checklist: add fundraising page → WhatsApp → share pledge link → first pledge
- WhatsApp is now a core onboarding step for both types
- Banner is dismissable via X button
- Dashboard always shows stats (with zeros), progress bar, empty-state card

SHOW DON'T GATE:
- Stats cards show immediately (with zeros, slightly faded)
- Collection progress bar always visible
- Empty-state card says 'Your pledge data will appear here'
- Getting started is a guidance banner, not a lock screen

EXTERNAL PAYMENT FLOW:
- Events can be paymentMode='external' with externalUrl
- Pledge flow: amount → identity → 'Donate on LaunchGood' redirect (skips schedule + payment method)
- ExternalRedirectStep: branded per platform (LaunchGood green, Enthuse purple, etc.)
- Marks pledge as 'initiated' when donor clicks through
- WhatsApp sends donation link instead of bank details
- Share button shares the external URL

EVENT CREATION:
- Payment mode toggle: 'Bank transfer' vs 'External page'
- External shows URL input + platform dropdown
- Fundraiser orgs default to external mode
- Platform badge on event cards

PLATFORMS SUPPORTED:
🌙 LaunchGood, 💜 Enthuse, 💛 JustGiving, 💚 GoFundMe, 🔗 Other/Custom

pledge-now-pay-later/src/lib/validators.ts

@@ -7,6 +7,9 @@ export const createEventSchema = z.object({
   location: z.string().max(500).optional(),
   goalAmount: z.number().int().positive().optional(), // pence
   currency: z.string().default('GBP'),
+  paymentMode: z.enum(['self', 'external']).default('self'),
+  externalUrl: z.string().url().max(1000).optional(),
+  externalPlatform: z.enum(['launchgood', 'enthuse', 'justgiving', 'gofundme', 'other']).optional(),
 })
 
 export const createQrSourceSchema = z.object({