Clarify billing usage labels

- rename monthly credits label to plan usage
- rename daily credits label to daily use
- clarify daily usage reset and out-of-credits copy

apps/x/apps/renderer/src/components/settings/account-settings.tsx

@@ -218,11 +218,11 @@ export function AccountSettings({ dialogOpen }: AccountSettingsProps) {
               </Button>
             </div>
             <div className="space-y-3 border-t pt-3">
-              <CreditUsageBar label="Monthly credits" bucket={billing.monthly} />
+              <CreditUsageBar label="Plan usage" bucket={billing.monthly} />
               <CreditUsageBar
-                label="Daily credits"
+                label="Daily use"
                 bucket={billing.daily}
-                helper="Resets daily at 00:00 UTC"
+                helper="Daily usage resets at 00:00 UTC"
               />
             </div>
           </div>

apps/x/apps/renderer/src/lib/billing-error.ts

@@ -8,7 +8,7 @@ export const BILLING_ERROR_PATTERNS = [
   {
     pattern: /not enough credits/i,
     title: "You've run out of credits",
-    subtitle: 'Upgrade your plan for more monthly credits. Daily credits reset at 00:00 UTC.',
+    subtitle: 'Upgrade your plan for more usage. Daily usage resets at 00:00 UTC.',
     cta: 'Upgrade plan',
   },
   {