Stripe integration: charity connects their own Stripe account

Model: PNPL never touches the money. Each charity connects their own
Stripe account by pasting their API key in Settings. When a donor
chooses card payment, they're redirected to Stripe Checkout. The money
lands in the charity's Stripe balance.

## Schema
- Organization.stripeSecretKey (new column)
- Organization.stripeWebhookSecret (new column)

## New/rewritten files
- src/lib/stripe.ts — getStripeForOrg(secretKey), per-org client
- src/app/api/stripe/checkout/route.ts — uses org's key, not env var
- src/app/api/stripe/webhook/route.ts — tries all org webhook secrets
- src/app/p/[token]/steps/card-payment-step.tsx — redirect to Stripe
  Checkout (no fake card form — Stripe handles PCI)

## Settings page
- New 'Card payments' section between Bank and Charity
- Instructions: how to get your Stripe API key
- Webhook setup in collapsed <details> (optional, for auto-confirm)
- 'Card payments live' green banner when connected
- Readiness bar shows Stripe status (5 columns now)

## Pledge flow
- PaymentStep shows card option ONLY if org has Stripe configured
- hasStripe flag passed from /api/qr/[token] → PaymentStep
- Secret key never exposed to frontend (only boolean hasStripe)

## How it works
1. Charity pastes sk_live_... in Settings → Save
2. Donor opens pledge link → sees 'Bank Transfer', 'Direct Debit', 'Card'
3. Donor picks card → enters name + email → redirects to Stripe Checkout
4. Stripe processes payment → money in charity's Stripe balance
5. (Optional) Webhook auto-confirms pledge as paid

Payment options:
- Bank Transfer: zero fees (default, always available)
- Direct Debit via GoCardless: 1% + 20p (if org configured)
- Card via Stripe: standard Stripe fees (if org configured)

temp_files/v4/ListScheduledGivingDonations.php

@@ -0,0 +1,53 @@
+<?php
+
+namespace App\Filament\Resources\ScheduledGivingDonationResource\Pages;
+
+use App\Filament\Resources\ScheduledGivingDonationResource;
+use App\Models\ScheduledGivingDonation;
+use Filament\Resources\Components\Tab;
+use Filament\Resources\Pages\ListRecords;
+use Illuminate\Database\Eloquent\Builder;
+
+class ListScheduledGivingDonations extends ListRecords
+{
+    protected static string $resource = ScheduledGivingDonationResource::class;
+
+    public function getHeading(): string
+    {
+        return 'Regular Giving';
+    }
+
+    public function getSubheading(): string
+    {
+        $active = ScheduledGivingDonation::where('is_active', true)->count();
+        return "{$active} people giving every month.";
+    }
+
+    public function getTabs(): array
+    {
+        $active = ScheduledGivingDonation::where('is_active', true)->count();
+        $inactive = ScheduledGivingDonation::where('is_active', false)->count();
+
+        return [
+            'active' => Tab::make('Active')
+                ->icon('heroicon-o-check-circle')
+                ->badge($active)
+                ->badgeColor('success')
+                ->modifyQueryUsing(fn (Builder $q) => $q->where('is_active', true)),
+
+            'cancelled' => Tab::make('Cancelled')
+                ->icon('heroicon-o-x-circle')
+                ->badge($inactive > 0 ? $inactive : null)
+                ->badgeColor('gray')
+                ->modifyQueryUsing(fn (Builder $q) => $q->where('is_active', false)),
+
+            'all' => Tab::make('All')
+                ->icon('heroicon-o-squares-2x2'),
+        ];
+    }
+
+    protected function getHeaderActions(): array
+    {
+        return [];
+    }
+}