fix(tests): remove low-value source snapshots and define test standards

apps/desktop/src/components/codeSnapshot/__tests__/CodeSnapshotDialogLayout.spec.ts

@@ -1,11 +0,0 @@
-import { readFileSync } from "node:fs";
-import { describe, expect, it } from "vitest";
-
-const dialogSource = readFileSync(new URL("../CodeSnapshotDialog.vue", import.meta.url), "utf8");
-
-describe("CodeSnapshotDialog layout", () => {
-  it("keeps the exported snapshot at its intrinsic width inside the scrollable preview", () => {
-    // 截图节点不能被外层 flex 布局压缩，否则长代码导出时会被裁切或错误换行。
-    expect(dialogSource).toContain('v-html="snapshotHtml" class="flex w-max min-w-[320px] flex-none"');
-  });
-});