diff --git a/src/config/defaultKhanegiUiConfig.ts b/src/config/defaultKhanegiUiConfig.ts
index 0633e09..20fa628 100644
--- a/src/config/defaultKhanegiUiConfig.ts
+++ b/src/config/defaultKhanegiUiConfig.ts
@@ -143,3 +143,41 @@ export function stripKhanegiSaMeta<T extends Record<string, unknown> | null | un
   return rest as T
 }
 
+function mapLegacyRoute(route: unknown) {
+  return route === 'products' ? 'buyProduct' : route
+}
+
+function mapLegacyNavItems<T extends { route?: unknown }>(items: T[] | undefined) {
+  if (!Array.isArray(items)) return items
+  return items.map((item) => ({
+    ...item,
+    route: mapLegacyRoute(item.route) as T['route'],
+  }))
+}
+
+/** هم‌تراز با اسکیمای userTheme (Zod) — جلوگیری از fallback تم */
+export function normalizeKhanegiUiConfigForClient<T extends Record<string, any>>(ui: T): T {
+  if (!ui || typeof ui !== 'object') return ui
+  const next = JSON.parse(JSON.stringify(ui)) as T
+
+  const fixApp = (app: any) => {
+    if (!app || typeof app !== 'object') return
+    if (app.startRoute === 'products') app.startRoute = 'buyProduct'
+    if (app.header && typeof app.header === 'object') {
+      app.header.variant = 'default'
+    }
+    if (app.navigation && typeof app.navigation === 'object') {
+      if (app.navigation.type === 'sidebar+bottom') app.navigation.type = 'both'
+      app.navigation.sidebar = mapLegacyNavItems(app.navigation.sidebar)
+      app.navigation.bottom = mapLegacyNavItems(app.navigation.bottom)
+      if (app.navigation.sidebarReferral?.route === 'products') {
+        app.navigation.sidebarReferral.route = 'buyProduct'
+      }
+    }
+  }
+
+  fixApp((next as any).app)
+  fixApp((next as any).defaultSnapshot?.app)
+  return next
+}
+
diff --git a/src/pages/UiConfigPage.vue b/src/pages/UiConfigPage.vue
index 7be76b6..00a5291 100644
--- a/src/pages/UiConfigPage.vue
+++ b/src/pages/UiConfigPage.vue
@@ -7,6 +7,7 @@ import api from '@/api/http'
 import {
   cloneKhanegiAppSnapshot,
   createDefaultKhanegiUiConfig,
+  normalizeKhanegiUiConfigForClient,
 } from '@/config/defaultKhanegiUiConfig'
 import {
   applyKhanegiPreset,
@@ -201,10 +202,15 @@ function buildSavePayload() {
   if (selectedPreset.value === 'custom') {
     markCustomAndSyncSchemes(config)
   }
-  const payload = JSON.parse(JSON.stringify(config)) as typeof config
+  const payload = normalizeKhanegiUiConfigForClient(
+    JSON.parse(JSON.stringify(config)) as typeof config,
+  )
   // Never drop or rewrite an existing factory snapshot on normal save
   if (config.defaultSnapshot) {
-    payload.defaultSnapshot = JSON.parse(JSON.stringify(config.defaultSnapshot))
+    payload.defaultSnapshot = normalizeKhanegiUiConfigForClient({
+      app: JSON.parse(JSON.stringify(config.defaultSnapshot.app)),
+      pages: JSON.parse(JSON.stringify(config.defaultSnapshot.pages || {})),
+    }) as typeof payload.defaultSnapshot
   }
   return payload
 }