Add image listing and asset management

Show images in asset directories with preview, rename, replacement, and trash recovery. Update local Markdown references when images move and restore original files if related metadata cannot be committed.

Refresh image previews after replacement and compare actual contents when deduplicating subsequent uploads.

internal/vault/vault_test.go

@@ -70,7 +70,7 @@ func TestMoveRollsBackWhenAssetDestinationIsTooLong(t *testing.T) {
 	}
 	// 笔记名可写入，但派生的 .assets 名超过文件系统的单段长度限制。
 	destination := strings.Repeat("a", 250) + ".md"
-	if _, err := v.Move("n.md", destination); err == nil {
+	if _, err := v.Move("n.md", destination, nil); err == nil {
 		t.Fatal("图片目录移动应失败")
 	}
 	if content, _, err := v.Read("n.md"); err != nil || string(content) != "原文" {
@@ -170,7 +170,7 @@ func TestMoveCarriesAssetsAndRewritesLinks(t *testing.T) {
 	if !strings.HasPrefix(link, "笔记%20A.assets/") {
 		t.Fatalf("资源链接不符: %s", link)
 	}
-	if rewritten, err := v.Move("dir/笔记 A.md", "other/B.md"); err != nil || !rewritten {
+	if rewritten, err := v.Move("dir/笔记 A.md", "other/B.md", nil); err != nil || !rewritten {
 		t.Fatalf("应报告正文改写: %v %v", rewritten, err)
 	}
 	data, _, err := v.Read("other/B.md")
@@ -184,7 +184,7 @@ func TestMoveCarriesAssetsAndRewritesLinks(t *testing.T) {
 	if _, err := os.Stat(filepath.Join(v.Root(), "other", "B.assets", strings.TrimPrefix(link, "笔记%20A.assets/"))); err != nil {
 		t.Fatal("图片目录未随笔记移动:", err)
 	}
-	if _, err := v.Move("other", "other/sub"); !errors.Is(err, ErrInvalidPath) {
+	if _, err := v.Move("other", "other/sub", nil); !errors.Is(err, ErrInvalidPath) {
 		t.Fatal("文件夹移入自身应被拒绝")
 	}
 }
@@ -221,10 +221,13 @@ func TestDeleteRestore(t *testing.T) {
 	}
 }
 
-func TestTreeHidesMetaAndAssets(t *testing.T) {
+func TestTreeShowsImagesButHidesMeta(t *testing.T) {
 	v := newVault(t)
 	v.Write("a.md", []byte("x"), Precondition{})
-	v.SaveAsset("a.md", "i.png", strings.NewReader("i"), 10)
+	link, err := v.SaveAsset("a.md", "i.png", strings.NewReader("i"), 10)
+	if err != nil {
+		t.Fatal(err)
+	}
 	v.Mkdir("folder")
 	os.WriteFile(filepath.Join(v.Root(), "note.txt"), []byte("x"), 0o644)
 	entries, err := v.Tree()
@@ -235,7 +238,7 @@ func TestTreeHidesMetaAndAssets(t *testing.T) {
 	for _, e := range entries {
 		paths = append(paths, e.Path)
 	}
-	if strings.Join(paths, ",") != "a.md,folder" {
+	if strings.Join(paths, ",") != "a.assets,"+link+",a.md,folder" {
 		t.Fatalf("目录树不符: %v", paths)
 	}
 }