feat(core): add tooltip for import dialog snapshot item (#10013)

[PD-2132](https://linear.app/affine-design/issue/PD-2132/import-导入优化：snapshot-需要一个问号，解释文档)

packages/frontend/core/src/desktop/dialogs/import/index.tsx

@@ -119,6 +119,10 @@ const importOptions = [
     prefixIcon: (
       <PageIcon color={cssVarV2('icon/primary')} width={20} height={20} />
     ),
+    suffixIcon: (
+      <HelpIcon color={cssVarV2('icon/primary')} width={20} height={20} />
+    ),
+    suffixTooltip: 'com.affine.import.snapshot.tooltip',
     testId: 'editor-option-menu-import-snapshot',
     type: 'snapshot' as ImportType,
   },