feat(input): 统一 PathChipsInput 历史记录并修复图片预览回退

此前输入框只能稳定撤回文本输入，普通 Chip、图片 Chip 与部分
引用操作的增删改没有接入统一历史；同时图片 Chip 在撤回后，其
blob 预览可能已被上层释放并 revoke，导致缩略图与悬浮预览失效。
这次调整让输入框整体行为更符合编辑器的一致交互预期。

- 将 draft、普通 Chip、图片 Chip、规则 Chip 的增删改统一接入历史栈
- 记录并恢复光标/选区，接管 historyUndo/historyRedo，支持 Ctrl/Cmd+Z 与 Ctrl+Y/Cmd+Shift+Z
- 让 Backspace 删除末尾 Chip、鼠标删除 Chip、@ 插入与粘贴图片都走统一撤回链路
- 在 blob 预览失效时自动回退到 Windows file URL，恢复缩略图与悬浮大图
- 合并 master 上已有的复制文件名按钮能力，并补齐组件测试覆盖复制按钮、撤回/重做与图片回退场景

验证：
- npm run test
- npm run i18n:check

Signed-off-by: Lulu <58587930+lulu-sk@users.noreply.github.com>

Author: lulu-sk

web/src/components/ui/path-chips-input.test.tsx

@@ -1,6 +1,6 @@
 // @vitest-environment jsdom
 
-import React, { act } from "react";
+import React, { act, useState } from "react";
 import { afterEach, describe, expect, it, vi } from "vitest";
 import { createRoot, type Root } from "react-dom/client";
 import PathChipsInput, { type PathChip } from "./path-chips-input";
@@ -30,7 +30,26 @@ vi.mock("@/components/ui/dialog", () => ({
 (globalThis as any).IS_REACT_ACT_ENVIRONMENT = true;
 
 /**
- * 中文说明：卸载并清理 React Root，避免测试间 DOM 相互污染。
+ * 中文说明：在单测中将 requestAnimationFrame 改为同步执行，确保撤回后的选区恢复及时生效。
+ */
+function installSyncRequestAnimationFrame(): () => void {
+  const originalRaf = (window as any).requestAnimationFrame as ((cb: FrameRequestCallback) => number) | undefined;
+  const originalCancel = (window as any).cancelAnimationFrame as ((id: number) => void) | undefined;
+  let seq = 0;
+  (window as any).requestAnimationFrame = (cb: FrameRequestCallback) => {
+    seq += 1;
+    try { cb(0); } catch {}
+    return seq;
+  };
+  (window as any).cancelAnimationFrame = () => {};
+  return () => {
+    (window as any).requestAnimationFrame = originalRaf;
+    (window as any).cancelAnimationFrame = originalCancel;
+  };
+}
+
+/**
+ * 中文说明：卸载并清理 React Root，避免不同用例之间相互污染。
  */
 function safeUnmountRoot(root: Root, host: HTMLElement): void {
   try {
@@ -44,7 +63,7 @@ function safeUnmountRoot(root: Root, host: HTMLElement): void {
 }
 
 /**
- * 中文说明：创建并挂载一个 React Root，便于在 jsdom 中验证组件渲染结果。
+ * 中文说明：创建并挂载一个独立的 React Root。
  */
 function createMountedRoot(): { host: HTMLDivElement; root: Root; unmount: () => void } {
   const host = document.createElement("div");
@@ -60,7 +79,7 @@ function createMountedRoot(): { host: HTMLDivElement; root: Root; unmount: () =>
 }
 
 /**
- * 中文说明：渲染最小化的 `PathChipsInput` 场景，只保留本次验证所需的受控属性。
+ * 中文说明：渲染最小化的 `PathChipsInput` 场景，只保留复制文件名验证所需的受控属性。
  */
 async function renderPathChipsInput(chips: PathChip[]): Promise<() => void> {
   const mounted = createMountedRoot();
@@ -91,6 +110,108 @@ function createPathChip(overrides: Partial<PathChip> & { isDir?: boolean }): Pat
   } as PathChip;
 }
 
+/**
+ * 中文说明：测试用受控包装器，模拟真实页面里 `draft/chips` 由父组件托管的场景。
+ */
+function Harness(props: { initialDraft?: string; initialChips?: PathChip[] }): React.ReactElement {
+  const [draft, setDraft] = useState(props.initialDraft ?? "");
+  const [chips, setChips] = useState<PathChip[]>(props.initialChips ?? []);
+  return (
+    <div>
+      <PathChipsInput
+        draft={draft}
+        onDraftChange={setDraft}
+        chips={chips}
+        onChipsChange={setChips}
+        multiline
+      />
+      <div data-testid="chips-count">{chips.length}</div>
+    </div>
+  );
+}
+
+/**
+ * 中文说明：从容器中获取实际编辑器（当前组件在测试里使用 textarea）。
+ */
+function getEditor(host: HTMLElement): HTMLTextAreaElement | HTMLInputElement {
+  const editor = host.querySelector("textarea, input");
+  if (!editor) throw new Error("missing editor");
+  return editor as HTMLTextAreaElement | HTMLInputElement;
+}
+
+/**
+ * 中文说明：读取当前 Chip 数量，便于断言删除/撤回结果。
+ */
+function getChipCount(host: HTMLElement): number {
+  const el = host.querySelector("[data-testid=\"chips-count\"]");
+  if (!el) throw new Error("missing chips count");
+  return Number(el.textContent || "0");
+}
+
+/**
+ * 中文说明：查找当前可见的 Chip 删除按钮。
+ */
+function getChipRemoveButton(host: HTMLElement): HTMLButtonElement {
+  const buttons = Array.from(host.querySelectorAll("button")) as HTMLButtonElement[];
+  const button = buttons.find((candidate) => (candidate.textContent || "").includes("×"));
+  if (!button) throw new Error("missing chip remove button");
+  return button;
+}
+
+/**
+ * 中文说明：获取 Chip 上显示的缩略图元素。
+ */
+function getChipPreviewImage(host: HTMLElement): HTMLImageElement {
+  const image = host.querySelector("img");
+  if (!image) throw new Error("missing chip preview image");
+  return image as HTMLImageElement;
+}
+
+/**
+ * 中文说明：派发一次键盘事件，用于模拟 Backspace / Ctrl+Z / Ctrl+Y。
+ */
+async function dispatchKeyDown(
+  target: HTMLElement,
+  init: KeyboardEventInit,
+): Promise<void> {
+  await act(async () => {
+    target.dispatchEvent(new KeyboardEvent("keydown", { bubbles: true, cancelable: true, ...init }));
+  });
+}
+
+/**
+ * 中文说明：派发一次输入事件，并附带 inputType 供历史合并逻辑识别。
+ */
+async function dispatchInput(
+  editor: HTMLTextAreaElement | HTMLInputElement,
+  nextValue: string,
+  inputType: string,
+): Promise<void> {
+  await act(async () => {
+    const setter = Object.getOwnPropertyDescriptor(Object.getPrototypeOf(editor), "value")?.set;
+    if (!setter) throw new Error("missing native value setter");
+    setter.call(editor, nextValue);
+    try { editor.setSelectionRange(nextValue.length, nextValue.length); } catch {}
+    const event = typeof InputEvent === "function"
+      ? new InputEvent("input", { bubbles: true, cancelable: true, inputType })
+      : new Event("input", { bubbles: true, cancelable: true });
+    if (!("inputType" in event)) {
+      Object.defineProperty(event, "inputType", { value: inputType });
+    }
+    editor.dispatchEvent(event);
+  });
+}
+
+/**
+ * 中文说明：依次派发 mousedown + click，模拟用户点击删除按钮。
+ */
+async function clickElement(target: HTMLElement): Promise<void> {
+  await act(async () => {
+    target.dispatchEvent(new MouseEvent("mousedown", { bubbles: true, cancelable: true }));
+    target.dispatchEvent(new MouseEvent("click", { bubbles: true, cancelable: true }));
+  });
+}
+
 describe("PathChipsInput（复制文件名按钮）", () => {
   let cleanup: (() => void) | null = null;
 
@@ -130,3 +251,142 @@ describe("PathChipsInput（复制文件名按钮）", () => {
     expect(copyButton).toBeNull();
   });
 });
+
+describe("PathChipsInput 撤回历史", () => {
+  let cleanup: (() => void) | null = null;
+  let restoreRaf: (() => void) | null = null;
+
+  afterEach(() => {
+    try { restoreRaf?.(); } catch {}
+    restoreRaf = null;
+    try { cleanup?.(); } catch {}
+    cleanup = null;
+  });
+
+  it("Backspace 删除的 chip 可以通过 Ctrl+Z 撤回", async () => {
+    restoreRaf = installSyncRequestAnimationFrame();
+    const mounted = createMountedRoot();
+    cleanup = mounted.unmount;
+
+    const initialChip: PathChip = {
+      id: "file-1",
+      blob: new Blob(),
+      previewUrl: "",
+      type: "text/path",
+      size: 0,
+      saved: true,
+      fromPaste: false,
+      wslPath: "/repo/README.md",
+      fileName: "README.md",
+      chipKind: "file",
+    } as PathChip;
+
+    await act(async () => {
+      mounted.root.render(<Harness initialChips={[initialChip]} />);
+    });
+
+    const editor = getEditor(mounted.host);
+    editor.focus();
+
+    await dispatchKeyDown(editor, { key: "Backspace" });
+    expect(getChipCount(mounted.host)).toBe(0);
+    expect(mounted.host.textContent || "").not.toContain("README.md");
+
+    await dispatchKeyDown(editor, { key: "z", ctrlKey: true });
+    expect(getChipCount(mounted.host)).toBe(1);
+    expect(mounted.host.textContent || "").toContain("README.md");
+  });
+
+  it("鼠标删除的图片 chip 可以撤回，且焦点保持在输入框", async () => {
+    restoreRaf = installSyncRequestAnimationFrame();
+    const mounted = createMountedRoot();
+    cleanup = mounted.unmount;
+
+    const imageChip: PathChip = {
+      id: "image-1",
+      blob: new Blob(),
+      previewUrl: "blob:test-image",
+      type: "image/png",
+      size: 12,
+      saved: true,
+      fromPaste: true,
+      wslPath: "/repo/image.png",
+      winPath: "C:\\repo\\image.png",
+      fileName: "image.png",
+      chipKind: "image",
+    } as PathChip;
+
+    await act(async () => {
+      mounted.root.render(<Harness initialChips={[imageChip]} />);
+    });
+
+    const editor = getEditor(mounted.host);
+    editor.focus();
+    const removeButton = getChipRemoveButton(mounted.host);
+
+    await clickElement(removeButton);
+    expect(getChipCount(mounted.host)).toBe(0);
+    expect(document.activeElement).toBe(editor);
+
+    await dispatchKeyDown(editor, { key: "z", ctrlKey: true });
+    expect(getChipCount(mounted.host)).toBe(1);
+    expect(mounted.host.textContent || "").toContain("image.png");
+  });
+
+  it("文字输入支持连续撤回与 Ctrl+Y 重做", async () => {
+    restoreRaf = installSyncRequestAnimationFrame();
+    const mounted = createMountedRoot();
+    cleanup = mounted.unmount;
+
+    await act(async () => {
+      mounted.root.render(<Harness />);
+    });
+
+    const editor = getEditor(mounted.host);
+    editor.focus();
+
+    await dispatchInput(editor, "a", "insertText");
+    await dispatchInput(editor, "ab", "insertText");
+    await dispatchInput(editor, "abc", "insertText");
+    expect(editor.value).toBe("abc");
+
+    await dispatchKeyDown(editor, { key: "z", ctrlKey: true });
+    expect(editor.value).toBe("");
+
+    await dispatchKeyDown(editor, { key: "y", ctrlKey: true });
+    expect(editor.value).toBe("abc");
+  });
+
+  it("图片 blob 预览失效后应回退到 file 预览", async () => {
+    restoreRaf = installSyncRequestAnimationFrame();
+    const mounted = createMountedRoot();
+    cleanup = mounted.unmount;
+
+    const imageChip: PathChip = {
+      id: "image-fallback-1",
+      blob: new Blob(),
+      previewUrl: "blob:revoked-image",
+      type: "image/png",
+      size: 12,
+      saved: true,
+      fromPaste: true,
+      wslPath: "/repo/image.png",
+      winPath: "C:\\repo\\image.png",
+      fileName: "image.png",
+      chipKind: "image",
+    } as PathChip;
+
+    await act(async () => {
+      mounted.root.render(<Harness initialChips={[imageChip]} />);
+    });
+
+    const image = getChipPreviewImage(mounted.host);
+    expect(image.getAttribute("src")).toBe("blob:revoked-image");
+
+    await act(async () => {
+      image.dispatchEvent(new Event("error", { bubbles: false, cancelable: false }));
+    });
+
+    expect(image.getAttribute("src")).toBe("file:///C:/repo/image.png");
+  });
+});