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/v3/CustomerResource.php

@@ -17,10 +17,8 @@ use Filament\Forms\Components\TextInput;
 use Filament\Forms\Form;
 use Filament\GlobalSearch\Actions\Action as GlobalSearchAction;
 use Filament\Resources\Resource;
-use Filament\Tables\Actions\Action;
 use Filament\Tables\Actions\EditAction;
 use Filament\Tables\Columns\TextColumn;
-use Filament\Tables\Filters\Filter;
 use Filament\Tables\Table;
 use Illuminate\Database\Eloquent\Builder;
 use Illuminate\Database\Eloquent\Model;
@@ -207,56 +205,7 @@ class CustomerResource extends Resource
                     ->since()
                     ->sortable(),
             ])
-            ->filters([
-                Filter::make('has_donations')
-                    ->label('Has donated')
-                    ->toggle()
-                    ->query(fn (Builder $q) => $q->has('donations')),
-
-                Filter::make('monthly_supporter')
-                    ->label('Monthly supporter')
-                    ->toggle()
-                    ->query(fn (Builder $q) => $q->whereHas(
-                        'scheduledGivingDonations',
-                        fn ($q2) => $q2->where('is_active', true)
-                    )),
-
-                Filter::make('gift_aid')
-                    ->label('Gift Aid donors')
-                    ->toggle()
-                    ->query(fn (Builder $q) => $q->whereHas(
-                        'donations',
-                        fn ($q2) => $q2->whereHas('donationPreferences', fn ($q3) => $q3->where('is_gift_aid', true))
-                    )),
-
-                Filter::make('major_donor')
-                    ->label('Major donors (£1000+)')
-                    ->toggle()
-                    ->query(function (Builder $q) {
-                        $q->whereIn('id', function ($sub) {
-                            $sub->select('customer_id')
-                                ->from('donations')
-                                ->join('donation_confirmations', 'donations.id', '=', 'donation_confirmations.donation_id')
-                                ->whereNotNull('donation_confirmations.confirmed_at')
-                                ->groupBy('customer_id')
-                                ->havingRaw('SUM(donations.amount) >= 100000');
-                        });
-                    }),
-
-                Filter::make('incomplete_donations')
-                    ->label('Has incomplete donations')
-                    ->toggle()
-                    ->query(fn (Builder $q) => $q->whereHas(
-                        'donations',
-                        fn ($q2) => $q2->whereDoesntHave('donationConfirmation', fn ($q3) => $q3->whereNotNull('confirmed_at'))
-                            ->where('created_at', '>=', now()->subDays(30))
-                    )),
-
-                Filter::make('recent')
-                    ->label('Joined last 30 days')
-                    ->toggle()
-                    ->query(fn (Builder $q) => $q->where('created_at', '>=', now()->subDays(30))),
-            ])
+            ->filters([])
             ->actions([
                 EditAction::make()
                     ->label('Open')