🐛 fix(data-grid): 修复快捷 WHERE 自动补全回车行为

- 调整快捷 WHERE 输入框 Enter 处理，避免抢占 AutoComplete 选中事件
- 方向键高亮建议项后回车优先选择字段
- 增加快捷 WHERE 回车行为回归测试

frontend/src/utils/dataGridWhereFilter.test.ts

@@ -7,6 +7,7 @@ import {
   normalizeQuickWhereCondition,
   resolveWhereConditionSuggestions,
   resolveWhereConditionSelectedValue,
+  shouldApplyQuickWhereOnEnter,
   validateQuickWhereCondition,
 } from './dataGridWhereFilter';
 
@@ -110,4 +111,30 @@ describe('dataGridWhereFilter', () => {
       }),
     ).toBe('`username` = ');
   });
+
+  it('lets autocomplete consume enter while quick where suggestions are open', () => {
+    expect(shouldApplyQuickWhereOnEnter({
+      key: 'Enter',
+      suggestionsOpen: true,
+      suggestionCount: 1,
+      activeSuggestionId: 'quick-where-list-0',
+    })).toBe(false);
+    expect(shouldApplyQuickWhereOnEnter({
+      key: 'Enter',
+      suggestionsOpen: true,
+      suggestionCount: 1,
+    })).toBe(true);
+    expect(shouldApplyQuickWhereOnEnter({
+      key: 'Enter',
+      suggestionsOpen: false,
+      suggestionCount: 1,
+      activeSuggestionId: 'quick-where-list-0',
+    })).toBe(true);
+    expect(shouldApplyQuickWhereOnEnter({
+      key: 'Enter',
+      shiftKey: true,
+      suggestionsOpen: false,
+      suggestionCount: 0,
+    })).toBe(false);
+  });
 });

frontend/src/utils/dataGridWhereFilter.ts

@@ -182,6 +182,26 @@ export const resolveWhereConditionSelectedValue = ({
   return applyWhereConditionSuggestion(String(currentInput ?? ''), insertTextValue);
 };
 
+export const shouldApplyQuickWhereOnEnter = ({
+  key,
+  shiftKey = false,
+  isComposing = false,
+  suggestionsOpen = false,
+  suggestionCount = 0,
+  activeSuggestionId = '',
+}: {
+  key: unknown;
+  shiftKey?: boolean;
+  isComposing?: boolean;
+  suggestionsOpen?: boolean;
+  suggestionCount?: number;
+  activeSuggestionId?: unknown;
+}): boolean => {
+  if (String(key || '') !== 'Enter') return false;
+  if (shiftKey || isComposing) return false;
+  return !(suggestionsOpen && suggestionCount > 0 && String(activeSuggestionId ?? '').trim());
+};
+
 export const resolveWhereConditionSuggestions = ({
   input,
   columnNames,