Prevent Stripe non-card payments from timing out prematurely

[dd32]

Summary

• Stripe non-card payments (boleto, OXXO, bank transfers) can take days to settle, but CampTix times out draft attendees after 24 hours
• Marks delayed-payment attendees as pending instead of completed on return from Stripe
• Extends the timeout window for pending payments by resetting tix_timestamp, with a 7-day safety cap
• Includes pending-status attendees in the timeout review query so they can be completed when payment settles

Changes

• camptix/addons/payment-stripe.php: Updated payment_return() to set pending status for unpaid sessions, extended pre_attendee_timeout() with delay logic, added delay_attendee_timeout() helper
• camptix/camptix.php: Updated review_timeout_payments() to also query pending attendees

Test plan

• Process a test boleto/OXXO payment via Stripe test mode
• Verify attendee shows as pending (not completed) immediately after checkout
• Verify attendee is not timed out within 24 hours while payment is still processing
• Verify attendee is marked completed once Stripe webhook confirms payment
• Verify 7-day safety limit prevents indefinite pending state

Fixes WordPress#1532

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