Improve delete UX and prepaid credit time display.

Show minutes and local expiry for resource credits; add shared delete hook with row/card loading overlays, detail-page deleting modal, and disabled controls to prevent double-delete.

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/src/billing/billing.service.ts

@@ -801,6 +801,15 @@ export class BillingService {
     const remainingMs = Math.max(0, new Date(credit.expiresAt).getTime() - now);
     const remainingDays = Math.floor(remainingMs / 86400000);
     const remainingHours = Math.floor((remainingMs % 86400000) / 3600000);
+    const remainingMinutes = Math.floor((remainingMs % 3600000) / 60000);
+    const remainingLabel =
+      remainingDays > 0
+        ? `${remainingDays}d ${remainingHours}h ${remainingMinutes}m`
+        : remainingHours > 0
+          ? `${remainingHours}h ${remainingMinutes}m`
+          : remainingMinutes > 0
+            ? `${remainingMinutes}m`
+            : 'less than 1m';
     return {
       id: credit.id,
       sourceAppName: credit.sourceAppName,
@@ -818,8 +827,10 @@ export class BillingService {
       billingCycle: credit.billingCycle,
       expiresAt: credit.expiresAt,
       remainingMs,
-      remainingLabel:
-        remainingDays > 0 ? `${remainingDays}d ${remainingHours}h` : `${remainingHours}h`,
+      remainingDays,
+      remainingHours,
+      remainingMinutes,
+      remainingLabel,
     };
   }