feat(webhooks): enhance Polar webhook processing with proper event handling

- Add support for subscription.uncanceled webhook event
  - Fix spelling mismatch for subscription.canceled (Polar) vs subscription.cancelled (code)
  - Implement proper cancel_at_period_end handling in subscription.canceled events
  - Add cancelled_at field updates for subscription.updated events
  - Handle Polar's spelling variants (canceled_at vs cancelled_at) consistently
  - Remove non-existent pause_reason column from subscription uncanceled handler
  - Enhance webhook logging with detailed field update tracking
  - Add comprehensive cancellation metadata storage in provider_data
  - Gracefully handle null provider_subscription_id in payment confirmation polling

  All Polar webhook events now properly sync subscription state including
  cancellation timing, reasons, and billing period details.

app/Livewire/PaymentConfirmation.php

@@ -117,7 +117,19 @@ class PaymentConfirmation extends Component
                 'poll_count' => $this->pollCount,
             ]);
 
-            // Check status via provider
+            // Check status via provider (only if we have a provider subscription ID)
+            if (empty($this->subscription->provider_subscription_id)) {
+                Log::info('PaymentConfirmation: Skipping provider status check - no provider subscription ID yet', [
+                    'subscription_id' => $this->subscription->id,
+                    'provider' => $this->subscription->provider,
+                    'provider_checkout_id' => $this->subscription->provider_checkout_id,
+                    'poll_count' => $this->pollCount,
+                ]);
+
+                // Don't update status, just continue polling
+                return;
+            }
+
             $statusResult = $orchestrator->checkSubscriptionStatus(
                 $user,
                 $this->subscription->provider,
@@ -157,6 +169,19 @@ class PaymentConfirmation extends Component
 
                     return;
                 }
+            } else {
+                // Handle status check failure
+                Log::warning('PaymentConfirmation: Provider status check failed', [
+                    'error' => $statusResult['error'] ?? 'Unknown error',
+                    'subscription_id' => $this->subscription->id,
+                    'retry_suggested' => $statusResult['retry_suggested'] ?? false,
+                ]);
+
+                // If retry is suggested (e.g., webhook not processed yet), continue polling
+                if (! ($statusResult['retry_suggested'] ?? false)) {
+                    // If retry is not suggested, we might want to show an error
+                    // but for now, continue polling to be safe
+                }
             }
 
             // Continue polling if not active and max polls not reached