🐛 fix(sidebar): 修复视图元数据重复导致侧边栏树渲染错乱

- MySQL 视图元数据缺失 schema 时回填当前数据库
- 避免多条回退查询生成重复视图节点
- 补充侧边栏视图去重回归测试

frontend/src/utils/sidebarMetadata.test.ts

@@ -24,6 +24,13 @@ describe('sidebarMetadata', () => {
     });
   });
 
+  it('falls back to the current database when MySQL-compatible view rows omit schema metadata', () => {
+    expect(normalizeSidebarViewMetadataEntry('mysql', 'information_schema', '', 'CHARACTER_SETS')).toEqual({
+      viewName: 'CHARACTER_SETS',
+      schemaName: 'information_schema',
+    });
+  });
+
   it('uses MySQL metadata queries for custom MySQL-compatible domestic drivers', () => {
     expect(resolveSidebarMetadataDialect('goldendb')).toBe('mysql');
     expect(resolveSidebarMetadataDialect('custom', 'gdb')).toBe('mysql');

frontend/src/utils/sidebarMetadata.ts

@@ -78,9 +78,14 @@ export const normalizeSidebarViewMetadataEntry = (
 
   const parsedViewName = splitQualifiedNameLast(viewName);
   const parsedNormalizedViewName = splitQualifiedNameLast(normalizedViewName);
+  const normalizedDialect = String(dialect || '').trim().toLowerCase();
+  const normalizedDbName = String(dbName || '').trim();
+  const resolvedSchemaName = String(
+    schemaName || parsedNormalizedViewName.parentPath || parsedViewName.parentPath || '',
+  ).trim();
   return {
     viewName: normalizedViewName,
-    schemaName: String(schemaName || parsedNormalizedViewName.parentPath || parsedViewName.parentPath || '').trim(),
+    schemaName: resolvedSchemaName || (normalizedDialect === 'mysql' ? normalizedDbName : ''),
   };
 };