Telepathic onboarding: welcome flow + context-aware dashboard

New: /dashboard/welcome — guided first-time setup
- Step 1: 'What are you raising for?' (starts with what excites them)
- Step 2: 'Where should donors send money?' (natural follow-up)
- Step 3: 'Want auto-reminders?' (WhatsApp as bonus, skippable)
- Step 4: 'Here's your link!' (dark section with copy/WhatsApp/share)
- Auto-creates event + first pledge link during flow
- User holds a shareable link within 90 seconds of signing up

Updated: /dashboard (context-aware home)
- State 1 (no events): auto-redirects to /dashboard/welcome
- State 2 (0 pledges): shows pledge link + share buttons prominently
- State 3 (has pledges): shows stats + feed
- State 4 (has 'said paid'): amber prompt to upload bank statement
- State 5 (100% collected): celebration banner
- No more onboarding checklist — dashboard adapts instead
- Event name as page header (not generic 'Home')
- Event switcher for multi-event orgs

Updated: /signup → redirects to /dashboard/welcome (not /dashboard)

Persona spec: docs/PERSONA_JOURNEY_SPEC.md

temp_files/AIAppealReviewService.php

@@ -61,7 +61,7 @@ class AIAppealReviewService
             } elseif ($result['decision'] === 'reject') {
                 $item->update([
                     'status' => 'change_requested',
-                    'message' => 'Auto-flagged: ' . implode('; ', $result['reasons']),
+                    'message' => substr('Auto-flagged: ' . implode('; ', $result['reasons']), 0, 250),
                 ]);
 
                 $appeal = $item->appeal;