fix(plans): prevent deletion of plans with active subscriptions

- Fix bulk delete and individual delete actions using before() hook with halt()
  - Add daily/weekly billing cycle options to plan resource and Polar provider
  - Enhance payment confirmation with dynamic polling and loading states
  - Add graceful handling for deleted plans in subscription display
  - Update Polar provider to support dynamic billing cycles

app/Models/Subscription.php

@@ -690,4 +690,59 @@ class Subscription extends Model
         // Fallback to legacy monthly_billing
         return $this->plan && $this->plan->monthly_billing ? 30 : 365;
     }
+
+    /**
+     * Get plan display name, handles deleted plans gracefully
+     */
+    public function getPlanDisplayName(): string
+    {
+        if ($this->plan) {
+            return $this->plan->name;
+        }
+
+        // Check provider data for stored plan name
+        if ($this->provider_data) {
+            // Check for Polar plan name
+            if (isset($this->provider_data['polar_subscription']['product']['name'])) {
+                return $this->provider_data['polar_subscription']['product']['name'];
+            }
+
+            // Check for stored plan details
+            if (isset($this->provider_data['plan_details']['name'])) {
+                return $this->provider_data['plan_details']['name'];
+            }
+
+            // Check metadata
+            if (isset($this->provider_data['plan_name'])) {
+                return $this->provider_data['plan_name'];
+            }
+        }
+
+        return 'Deleted Plan';
+    }
+
+    /**
+     * Get plan price, handles deleted plans gracefully
+     */
+    public function getPlanPrice(): float
+    {
+        if ($this->plan) {
+            return $this->plan->price;
+        }
+
+        // Check provider data for stored plan price
+        if ($this->provider_data) {
+            // Check for Polar subscription amount
+            if (isset($this->provider_data['polar_subscription']['amount'])) {
+                return $this->provider_data['polar_subscription']['amount'] / 100; // Convert from cents
+            }
+
+            // Check for stored plan details
+            if (isset($this->provider_data['plan_details']['price'])) {
+                return (float) $this->provider_data['plan_details']['price'];
+            }
+        }
+
+        return 0.0;
+    }
 }