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')

src/lib/api/client.ts

@@ -17,6 +17,8 @@ import type {
 
 const API_BASE = process.env.NEXT_PUBLIC_API_URL ?? 'https://ghback.nabaksoft.ir'
 
+console.log('api-base: ', API_BASE);
+
 async function http<T>(url: string, init?: RequestInit): Promise<T> {
     const res = await fetch(url, { ...init, headers: { 'Content-Type': 'application/json', ...(init?.headers || {}) } })
     if (!res.ok) {
@@ -33,7 +35,14 @@ async function http<T>(url: string, init?: RequestInit): Promise<T> {
         error.status = res.status
         throw error
     }
-    return res.json() as Promise<T>
+    
+    // Check if response has content
+    const text = await res.text()
+    if (!text) {
+        return undefined as T  // or return null as T, depending on your preference
+    }
+    
+    return JSON.parse(text) as T
 }
 
 export const api = {
@@ -65,7 +74,12 @@ export const api = {
     updateDeviceSettings: (dto: DeviceSettingsDto) => http<void>(`${API_BASE}/api/devicesettings`, { method: 'PUT', body: JSON.stringify(dto) }),
 
     // Authentication
-    sendCode: (request: SendCodeRequest) => http<SendCodeResponse>(`${API_BASE}/api/auth/send-code`, { method: 'POST', body: JSON.stringify(request) }),
+    sendCode: (request: SendCodeRequest) => {
+        const url = `${API_BASE}/api/auth/send-code`;
+
+        console.log('posting to ' + url);
+        return http<SendCodeResponse>(url, { method: 'POST', body: JSON.stringify(request) })
+    },
     verifyCode: (request: VerifyCodeRequest) => http<VerifyCodeResponse>(`${API_BASE}/api/auth/verify-code`, { method: 'POST', body: JSON.stringify(request) }),
     canResend: (mobile: string) => http<{ canResend: boolean }>(`${API_BASE}/api/auth/can-resend?mobile=${encodeURIComponent(mobile)}`),