fix loading issue and api error on empty response

src/app/login/page.tsx

@@ -46,6 +46,7 @@ export default function LoginPage() {
             if (result.success) {
                 // Redirect to verify page with mobile number
                 router.push(`/verify-code?mobile=${encodeURIComponent(normalizedMobile)}`)
+                return // Don't set loading to false — component will unmount
             } else {
                 setError(result.message || 'خطا در ارسال کد')
             }

src/app/page.tsx

@@ -62,6 +62,7 @@ export default function Home() {
       if (result.success) {
         // Redirect to verify page with mobile number
         router.push(`/verify-code?mobile=${encodeURIComponent(normalizedMobile)}`)
+        return // Don't set loading to false — component will unmount
       } else {
         setError(result.message || 'خطا در ارسال کد')
       }

src/app/verify-code/page.tsx

@@ -93,14 +93,17 @@ function VerifyCodeContent() {
                     } else if (devicesResult.totalCount === 1) {
                         // Single device - redirect to calendar
                         router.push(`/calendar?deviceId=${devicesResult.items[0].id}`)
+                        return // Don't set loading to false — component will unmount
                     } else {
                         // Multiple devices - redirect to device list
                         router.push('/devices')
+                        return // Don't set loading to false — component will unmount
                     }
                 } catch (deviceError) {
                     console.error('Error fetching devices:', deviceError)
                     // Still redirect to devices page to handle error there
                     router.push('/devices')
+                    return // Don't set loading to false — component will unmount
                 }
             } else {
                 setError(result.message || 'کد وارد شده نادرست است')