feat(screenshot): 截图工具加 Snipaste 式标注工具栏 (#1571)

* feat(screenshot): 截图工具加 Snipaste 式标注工具栏

框选后在选区下方浮出工具栏，可在图上画完再确认。纯前端，全部落在 app-crop.js 的现有裁剪遮罩里。

- 工具：矩形/椭圆/箭头/画笔/荧光笔/文字/马赛克，调色板+线宽 S/M/L，撤销/重做/保存/确认/取消
- 标注存图片自然坐标，renderAnnotations(ctx,mapFn,scale) 同供实时预览与烤制，所见即所得，抗 resize
- 马赛克 commit 时像素化进缓存 canvas，避免每帧重算
- 快捷键 Ctrl+Z/Y、Delete 撤最后一笔、Enter 确认；右键绘图中丢草稿、空闲退回选择工具
- 复制剪贴板/保存到文件输出原清晰度 PNG；发猫娘的 720p 压缩仍在 app-buttons 裁剪之外，不变
- 按钮观感对齐 react .composer-tool-btn；工具栏始终桌面布局，触摸仅服务真手机
- 8 语言补 cropTool*/cropUndo/cropRedo/cropSave 键

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

* fix(screenshot): 清选区复位工具 + resize 按图片坐标重映射选区

- clearSelection 后复位到选择工具：否则清选区后工具栏已隐藏、绘图工具仍激活，
  再拖拽会被绘图分支拦截画成隐形标注，用户无法重新框选（Codex P2）
- onResize 先用旧 metrics 把选区换算成图片坐标，computeImgMetrics 后再映射回 canvas，
  避免直接 clampSel 旧 canvas 坐标导致选区相对截图漂移（Codex P2）

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

* fix(screenshot): 绘制限定在选区内 + 工具栏无障碍语义

- 绘图起笔必须在选区内（!sel || !hitTestInside 直接忽略），草稿点 clamp 到选区，
  不再因选区外点击产生被 clip 掉的隐形标注、污染撤销栈（CodeRabbit）
- 工具/颜色/线宽按钮补 aria-pressed 选中态；调色板纯色按钮补 i18n aria-label
  （8 语言加 cropColorRed/Yellow/Green/Blue/White/Black）（CodeRabbit）

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

---------

Co-authored-by: Hongzhi Wen <cartabio.coder1@gmail.com>
Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: 3 people

static/app-crop.js

@@ -2248,6 +2248,155 @@ body.react-chat-window-dragging {
     }
 }
 
+/* ===== 截图标注工具栏 ===== */
+.crop-toolbar {
+    position: absolute;
+    z-index: 6;
+    display: flex;
+    flex-wrap: wrap;
+    align-items: center;
+    gap: 4px;
+    max-width: calc(100vw - 24px);
+    padding: 6px 8px;
+    border-radius: 12px;
+    background: rgba(8, 11, 18, 0.85);
+    border: 1px solid rgba(255, 255, 255, 0.12);
+    box-shadow: 0 12px 36px rgba(0, 0, 0, 0.4);
+    backdrop-filter: blur(18px);
+    -webkit-backdrop-filter: blur(18px);
+    pointer-events: auto;
+    user-select: none;
+    animation: crop-fade-in 0.15s ease;
+}
+
+.crop-tool-group {
+    display: flex;
+    align-items: center;
+    gap: 2px;
+}
+
+.crop-tool-divider {
+    width: 1px;
+    align-self: stretch;
+    margin: 4px;
+    background: rgba(255, 255, 255, 0.14);
+}
+
+/* 按钮观感对齐 react 输入框的 .composer-tool-btn */
+.crop-tool-btn {
+    display: inline-flex;
+    align-items: center;
+    justify-content: center;
+    width: 32px;
+    height: 32px;
+    padding: 0;
+    border: 0;
+    border-radius: 6px;
+    background: transparent;
+    color: rgba(255, 255, 255, 0.82);
+    cursor: pointer;
+    transition: background 0.15s ease, color 0.15s ease;
+}
+
+.crop-tool-btn:hover {
+    background: rgba(68, 183, 254, 0.12);
+    color: #8bd8ff;
+}
+
+.crop-tool-btn.is-active {
+    background: rgba(68, 183, 254, 0.18);
+    color: #44b7fe;
+}
+
+.crop-tool-btn:disabled {
+    opacity: 0.4;
+    cursor: not-allowed;
+}
+
+.crop-tool-btn svg {
+    display: block;
+    pointer-events: none;
+}
+
+.crop-tool-btn:focus-visible,
+.crop-color-swatch:focus-visible,
+.crop-width-btn:focus-visible {
+    outline: 2px solid rgba(68, 183, 254, 0.85);
+    outline-offset: 1px;
+}
+
+.crop-tool-confirm { color: #34c759; }
+.crop-tool-confirm:hover { background: rgba(52, 199, 89, 0.16); color: #4cd964; }
+.crop-tool-confirm.is-active { background: rgba(52, 199, 89, 0.16); color: #34c759; }
+
+.crop-tool-cancel { color: #ff6b7a; }
+.crop-tool-cancel:hover { background: rgba(220, 53, 69, 0.18); color: #ff8a97; }
+
+/* 调色板 */
+.crop-color-swatch {
+    width: 18px;
+    height: 18px;
+    margin: 0 1px;
+    padding: 0;
+    border-radius: 50%;
+    border: 2px solid rgba(255, 255, 255, 0.25);
+    cursor: pointer;
+    transition: transform 0.12s ease, border-color 0.15s ease, box-shadow 0.15s ease;
+}
+
+.crop-color-swatch:hover { transform: scale(1.12); }
+
+.crop-color-swatch.is-active {
+    border-color: #fff;
+    box-shadow: 0 0 0 2px rgba(68, 183, 254, 0.7);
+}
+
+/* 线宽 S / M / L */
+.crop-width-btn {
+    min-width: 26px;
+    height: 28px;
+    padding: 0 6px;
+    border: 0;
+    border-radius: 6px;
+    background: transparent;
+    color: rgba(255, 255, 255, 0.7);
+    font-size: 0.8rem;
+    font-weight: 600;
+    cursor: pointer;
+    transition: background 0.15s ease, color 0.15s ease;
+}
+
+.crop-width-btn:hover { background: rgba(68, 183, 254, 0.12); color: #8bd8ff; }
+.crop-width-btn.is-active { background: rgba(68, 183, 254, 0.18); color: #44b7fe; }
+
+/* 文字工具的浮层 textarea */
+.crop-text-editor {
+    position: absolute;
+    z-index: 7;
+    margin: 0;
+    padding: 1px 2px;
+    min-width: 40px;
+    border: 1px dashed rgba(68, 183, 254, 0.9);
+    border-radius: 3px;
+    background: rgba(0, 0, 0, 0.18);
+    color: #fff;
+    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", sans-serif;
+    font-weight: 600;
+    line-height: 1.28;
+    white-space: pre;
+    overflow: hidden;
+    outline: none;
+    resize: none;
+    pointer-events: auto;
+    caret-color: currentColor;
+}
+
+/* 绘图工具激活时隐藏选区手柄与网格线，避免误触 */
+.crop-selection-box.crop-selection-box--drawing .crop-selection-handle,
+.crop-selection-box.crop-selection-box--drawing .crop-selection-grid-line {
+    display: none;
+}
+
 #text-input-row {
     display: flex;
     gap: 8px;

static/css/index.css

@@ -697,6 +697,23 @@
         "cropTabRecapturing": "Recapturing...",
         "cropConfirmTitle": "Confirm crop",
         "cropClearSelectionTitle": "Clear selection",
+        "cropToolSelect": "Select / Move",
+        "cropToolRect": "Rectangle",
+        "cropToolEllipse": "Ellipse",
+        "cropToolArrow": "Arrow",
+        "cropToolPen": "Pen",
+        "cropToolHighlight": "Highlighter",
+        "cropToolText": "Text",
+        "cropToolMosaic": "Mosaic",
+        "cropUndo": "Undo",
+        "cropRedo": "Redo",
+        "cropSave": "Save to file",
+        "cropColorRed": "Red",
+        "cropColorYellow": "Yellow",
+        "cropColorGreen": "Green",
+        "cropColorBlue": "Blue",
+        "cropColorWhite": "White",
+        "cropColorBlack": "Black",
         "avatarPreview": "Show current avatar",
         "avatarPreviewLabel": "Current avatar",
         "avatarPreviewCardTitle": "Current Avatar",

static/locales/en.json

@@ -697,6 +697,23 @@
         "cropTabRecapturing": "Recapturando...",
         "cropConfirmTitle": "Confirmar recorte",
         "cropClearSelectionTitle": "Borrar selección",
+        "cropToolSelect": "Seleccionar / mover",
+        "cropToolRect": "Rectángulo",
+        "cropToolEllipse": "Elipse",
+        "cropToolArrow": "Flecha",
+        "cropToolPen": "Lápiz",
+        "cropToolHighlight": "Marcador",
+        "cropToolText": "Texto",
+        "cropToolMosaic": "Mosaico",
+        "cropUndo": "Deshacer",
+        "cropRedo": "Rehacer",
+        "cropSave": "Guardar en archivo",
+        "cropColorRed": "Rojo",
+        "cropColorYellow": "Amarillo",
+        "cropColorGreen": "Verde",
+        "cropColorBlue": "Azul",
+        "cropColorWhite": "Blanco",
+        "cropColorBlack": "Negro",
         "avatarPreview": "Mostrar avatar actual",
         "avatarPreviewLabel": "avatar actual",
         "avatarPreviewCardTitle": "Avatar actual",

static/locales/es.json

@@ -697,6 +697,23 @@
         "cropTabRecapturing": "再撮影中...",
         "cropConfirmTitle": "トリミングを確定",
         "cropClearSelectionTitle": "選択をクリア",
+        "cropToolSelect": "選択/移動",
+        "cropToolRect": "四角形",
+        "cropToolEllipse": "楕円",
+        "cropToolArrow": "矢印",
+        "cropToolPen": "ペン",
+        "cropToolHighlight": "蛍光ペン",
+        "cropToolText": "テキスト",
+        "cropToolMosaic": "モザイク",
+        "cropUndo": "元に戻す",
+        "cropRedo": "やり直し",
+        "cropSave": "ファイルに保存",
+        "cropColorRed": "赤",
+        "cropColorYellow": "黄",
+        "cropColorGreen": "緑",
+        "cropColorBlue": "青",
+        "cropColorWhite": "白",
+        "cropColorBlack": "黒",
         "avatarPreview": "現在のアバターを表示",
         "avatarPreviewLabel": "現在のアバター",
         "avatarPreviewCardTitle": "現在のアバター",

static/locales/ja.json

@@ -697,6 +697,23 @@
         "cropTabRecapturing": "다시 캡처 중...",
         "cropConfirmTitle": "자르기 확인",
         "cropClearSelectionTitle": "선택 영역 지우기",
+        "cropToolSelect": "선택/이동",
+        "cropToolRect": "사각형",
+        "cropToolEllipse": "타원",
+        "cropToolArrow": "화살표",
+        "cropToolPen": "펜",
+        "cropToolHighlight": "형광펜",
+        "cropToolText": "텍스트",
+        "cropToolMosaic": "모자이크",
+        "cropUndo": "실행 취소",
+        "cropRedo": "다시 실행",
+        "cropSave": "파일로 저장",
+        "cropColorRed": "빨강",
+        "cropColorYellow": "노랑",
+        "cropColorGreen": "초록",
+        "cropColorBlue": "파랑",
+        "cropColorWhite": "흰색",
+        "cropColorBlack": "검정",
         "avatarPreview": "현재 아바타 표시",
         "avatarPreviewLabel": "현재 아바타",
         "avatarPreviewCardTitle": "현재 아바타",

static/locales/ko.json

@@ -697,6 +697,23 @@
         "cropTabRecapturing": "Recapturando...",
         "cropConfirmTitle": "Confirmar recorte",
         "cropClearSelectionTitle": "Limpar seleção",
+        "cropToolSelect": "Selecionar / mover",
+        "cropToolRect": "Retângulo",
+        "cropToolEllipse": "Elipse",
+        "cropToolArrow": "Seta",
+        "cropToolPen": "Caneta",
+        "cropToolHighlight": "Marcador",
+        "cropToolText": "Texto",
+        "cropToolMosaic": "Mosaico",
+        "cropUndo": "Desfazer",
+        "cropRedo": "Refazer",
+        "cropSave": "Salvar em arquivo",
+        "cropColorRed": "Vermelho",
+        "cropColorYellow": "Amarelo",
+        "cropColorGreen": "Verde",
+        "cropColorBlue": "Azul",
+        "cropColorWhite": "Branco",
+        "cropColorBlack": "Preto",
         "avatarPreview": "Mostrar avatar atual",
         "avatarPreviewLabel": "Avatar atual",
         "avatarPreviewCardTitle": "Avatar atual",

static/locales/pt.json

@@ -697,6 +697,23 @@
         "cropTabRecapturing": "Повторный захват...",
         "cropConfirmTitle": "Подтвердить обрезку",
         "cropClearSelectionTitle": "Очистить выделение",
+        "cropToolSelect": "Выбор / перемещение",
+        "cropToolRect": "Прямоугольник",
+        "cropToolEllipse": "Эллипс",
+        "cropToolArrow": "Стрелка",
+        "cropToolPen": "Карандаш",
+        "cropToolHighlight": "Маркер",
+        "cropToolText": "Текст",
+        "cropToolMosaic": "Мозаика",
+        "cropUndo": "Отменить",
+        "cropRedo": "Повторить",
+        "cropSave": "Сохранить в файл",
+        "cropColorRed": "Красный",
+        "cropColorYellow": "Жёлтый",
+        "cropColorGreen": "Зелёный",
+        "cropColorBlue": "Синий",
+        "cropColorWhite": "Белый",
+        "cropColorBlack": "Чёрный",
         "avatarPreview": "Показать текущий аватар",
         "avatarPreviewLabel": "Текущий аватар",
         "avatarPreviewCardTitle": "Текущий аватар",

static/locales/ru.json

@@ -697,6 +697,23 @@
         "cropTabRecapturing": "正在重新截图...",
         "cropConfirmTitle": "确认截图",
         "cropClearSelectionTitle": "取消选区",
+        "cropToolSelect": "选择/移动",
+        "cropToolRect": "矩形",
+        "cropToolEllipse": "椭圆",
+        "cropToolArrow": "箭头",
+        "cropToolPen": "画笔",
+        "cropToolHighlight": "荧光笔",
+        "cropToolText": "文字",
+        "cropToolMosaic": "马赛克",
+        "cropUndo": "撤销",
+        "cropRedo": "重做",
+        "cropSave": "保存到文件",
+        "cropColorRed": "红色",
+        "cropColorYellow": "黄色",
+        "cropColorGreen": "绿色",
+        "cropColorBlue": "蓝色",
+        "cropColorWhite": "白色",
+        "cropColorBlack": "黑色",
         "avatarPreview": "显示当前头像",
         "avatarPreviewLabel": "当前头像",
         "avatarPreviewCardTitle": "当前头像",

static/locales/zh-CN.json

@@ -697,6 +697,23 @@
         "cropTabRecapturing": "正在重新截圖...",
         "cropConfirmTitle": "確認截圖",
         "cropClearSelectionTitle": "取消選區",
+        "cropToolSelect": "選擇/移動",
+        "cropToolRect": "矩形",
+        "cropToolEllipse": "橢圓",
+        "cropToolArrow": "箭頭",
+        "cropToolPen": "畫筆",
+        "cropToolHighlight": "螢光筆",
+        "cropToolText": "文字",
+        "cropToolMosaic": "馬賽克",
+        "cropUndo": "復原",
+        "cropRedo": "重做",
+        "cropSave": "儲存至檔案",
+        "cropColorRed": "紅色",
+        "cropColorYellow": "黃色",
+        "cropColorGreen": "綠色",
+        "cropColorBlue": "藍色",
+        "cropColorWhite": "白色",
+        "cropColorBlack": "黑色",
         "avatarPreview": "顯示當前頭像",
         "avatarPreviewLabel": "當前頭像",
         "avatarPreviewCardTitle": "當前頭像",