fix: repair the unexpected form default value (#5567)

* fix: Fix inconsistent spacing around search form (issue #5429)

* fix: repair the unexpected default value in validated form.(issue #5451)

* Update packages/@core/ui-kit/form-ui/src/use-form-context.ts

Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>

---------

Co-authored-by: Jin Mao <50581550+jinmao88@users.noreply.github.com>
Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>

packages/@core/ui-kit/form-ui/src/use-form-context.ts

@@ -10,7 +10,7 @@ import { createContext } from '@vben-core/shadcn-ui';
 import { isString, mergeWithArrayOverride, set } from '@vben-core/shared/utils';
 
 import { useForm } from 'vee-validate';
-import { object } from 'zod';
+import { object, ZodIntersection, ZodNumber, ZodObject, ZodString } from 'zod';
 import { getDefaultsForSchema } from 'zod-defaults';
 
 type ExtendFormProps = VbenFormProps & { formApi: ExtendedFormApi };
@@ -52,7 +52,12 @@ export function useFormInitial(
       if (Reflect.has(item, 'defaultValue')) {
         set(initialValues, item.fieldName, item.defaultValue);
       } else if (item.rules && !isString(item.rules)) {
+        // 检查规则是否适合提取默认值
+        const customDefaultValue = getCustomDefaultValue(item.rules);
         zodObject[item.fieldName] = item.rules;
+        if (customDefaultValue !== undefined) {
+          initialValues[item.fieldName] = customDefaultValue;
+        }
       }
     });
 
@@ -64,6 +69,38 @@ export function useFormInitial(
     }
     return mergeWithArrayOverride(initialValues, zodDefaults);
   }
+  // 自定义默认值提取逻辑
+  function getCustomDefaultValue(rule: any): any {
+    if (rule instanceof ZodString) {
+      return ''; // 默认为空字符串
+    } else if (rule instanceof ZodNumber) {
+      return null; // 默认为 null（避免显示 0）
+    } else if (rule instanceof ZodObject) {
+      // 递归提取嵌套对象的默认值
+      const defaultValues: Record<string, any> = {};
+      for (const [key, valueSchema] of Object.entries(rule.shape)) {
+        defaultValues[key] = getCustomDefaultValue(valueSchema);
+      }
+      return defaultValues;
+    } else if (rule instanceof ZodIntersection) {
+      // 对于交集类型，从schema 提取默认值
+      const leftDefaultValue = getCustomDefaultValue(rule._def.left);
+      const rightDefaultValue = getCustomDefaultValue(rule._def.right);
+
+      // 如果左右两边都能提取默认值，合并它们
+      if (
+        typeof leftDefaultValue === 'object' &&
+        typeof rightDefaultValue === 'object'
+      ) {
+        return { ...leftDefaultValue, ...rightDefaultValue };
+      }
+
+      // 否则优先使用左边的默认值
+      return leftDefaultValue ?? rightDefaultValue;
+    } else {
+      return undefined; // 其他类型不提供默认值
+    }
+  }
 
   return {
     delegatedSlots,