docs(slides): add whiteboard element documentation and improve slide guidance

skills/lark-slides/SKILL.md

@@ -19,6 +19,8 @@ metadata:
 | 编辑单个标题、文本块、图片或局部元素 | 优先块级替换/插入，不改页序 | `slides +replace-slide`、`lark-slides-replace-slide.md` |
 | 读取或分析已有 PPT | 解析 slides/wiki token，回读全文或单页 XML，保存 `xml_presentation_id`、`slide_id`、`revision_id` | `xml_presentations.get`、`xml_presentation.slide.get` |
 | 上传或使用图片 | 先上传为 `file_token`，禁止直接写 http(s) 外链 | `slides +media-upload`，或 `+create --slides` 的 `@./path` 占位符 |
+| 在 slide 中绘制柱/条/折线/面积/雷达/饼等有数据序列的图表 | 使用原生 `<chart>` 元素 | `xml-schema-quick-ref.md` |
+| 在 slide 中绘制流程图、时序图、架构图、散点图、漏斗图或装饰图案 | 必须先用 Read 工具读取参考文档，再生成 `<whiteboard>` 元素 | [`lark-slides-whiteboard.md`](references/lark-slides-whiteboard.md) |
 | 用户提到模板、主题、版式 | 先检索模板，再摘要，必要时裁切骨架 | `template_tool.py search → summarize → extract` |
 | 创建失败、空白页、3350001、布局异常 | 先回读状态，再按排障清单修复，不假设原操作原子成功 | `troubleshooting.md`、`validation-checklist.md` |
 
@@ -80,6 +82,7 @@ lark-cli auth login --domain slides
 - 创建：[`lark-slides-create.md`](references/lark-slides-create.md)
 - 编辑：[`lark-slides-edit-workflows.md`](references/lark-slides-edit-workflows.md)、[`lark-slides-replace-slide.md`](references/lark-slides-replace-slide.md)
 - 图片：[`lark-slides-media-upload.md`](references/lark-slides-media-upload.md)
+- 流程图 / 时序图 / 架构图 / 装饰图案：[`lark-slides-whiteboard.md`](references/lark-slides-whiteboard.md)
 - 模板：[`template-catalog.md`](references/template-catalog.md)、[`scripts/template_tool.py`](scripts/template_tool.py)
 - 排障：[`troubleshooting.md`](references/troubleshooting.md)
 - 完整协议：[`slides_xml_schema_definition.xml`](references/slides_xml_schema_definition.xml)
@@ -183,7 +186,7 @@ lark-cli slides xml_presentation.slide create \
   --data "$(jq -n --arg content '<slide xmlns="http://www.larkoffice.com/sml/2.0">
   <style><fill><fillColor color="BACKGROUND_COLOR"/></fill></style>
   <data>
-    在这里放置 shape、line、table、chart 等元素
+    在这里放置 shape、line、table、chart、whiteboard 等元素
   </data>
 </slide>' '{slide:{content:$content}}')"
 

skills/lark-slides/references/asset-planning.md

@@ -1,13 +1,13 @@
 # Asset Planning
 
-新建演示文稿或大幅改写页面时，在写入 `slide_plan.json` 前后都可以参考本文件。目标是让 agent 主动识别有价值的图、图标、图表、截图或示意图需求，同时保持 deck 在没有真实素材时也能完整执行。
+新建演示文稿或大幅改写页面时，在写入 `slide_plan.json` 前后都可以参考本文件。目标是让 agent 主动识别有价值的图、图标、图表、流程图、时序图、架构图、装饰图案、截图或示意图需求，同时保持 deck 在没有真实素材时也能完整执行。
 
 本文件只定义轻量资产规划。不要把它理解成素材采集流程。
 
 ## Core Rules
 
 - `asset_need` is metadata only. It can guide page design, but it must not require web search, local download, media upload, or external tools.
-- Every planned asset must include a fallback visual plan so the slide can be generated with XML shapes, text, arrows, tables, simple charts, or placeholder regions.
+- Every planned asset must include a fallback visual plan so the slide can be generated with XML shapes, text, arrows, tables, simple charts, whiteboard diagrams, or placeholder regions.
 - Asset needs must serve the page's `key_message` and `visual_focus`. Do not add decorative assets that do not clarify the page.
 - Prefer a few high-value asset plans over one asset on every page. For a 6-page technical or business deck, plan assets on at least 3 pages when the content allows.
 - If a real local asset already exists or the user provides one, it can be used through the normal media-upload workflow. Still keep `fallback_if_missing` in the plan.
@@ -22,7 +22,7 @@ Use an object for one planned asset, or an array when a page genuinely needs mul
   "asset_type": "architecture_diagram",
   "purpose": "Show how API gateway, planner, XML generator, and Slides API interact.",
   "suggested_query": "agent native slides runtime architecture diagram",
-  "fallback_if_missing": "Draw grouped boxes and arrows with XML shapes; use labels instead of an image."
+  "fallback_if_missing": "Draw grouped boxes connected by arrows with short labels."
 }
 ```
 
@@ -43,7 +43,7 @@ For a page without a meaningful asset need, use:
 - `architecture_diagram`: system components, data flow, dependency map, or model structure.
 - `icon`: small semantic symbol for a concept, step, role, or status.
 - `logo`: brand, product, team, or customer mark.
-- `chart`: line, bar, pie, funnel, scatter, or chart-like data visual.
+- `chart`: line, bar, pie, radar, area, or combo data visual. Note: `<chart>` does not support funnel or scatter — map those to `<whiteboard>` SVG at generation time.
 - `infographic`: composed visual explanation, usually combining labels, numbers, and simple shapes.
 - `screenshot`: product UI, terminal output, workflow state, or page capture.
 - `flow_diagram`: process, sequence, decision tree, or mechanism diagram.
@@ -118,7 +118,7 @@ Business comparison page:
 When generating XML:
 
 1. If an asset exists and the workflow supports it, place it in the planned visual region.
-2. If no asset exists, immediately render `fallback_if_missing` with XML-native shapes, text, lines, arrows, tables, or chart-like elements.
+2. If no asset exists, immediately render `fallback_if_missing` with XML-native shapes, text, lines, arrows, tables, whiteboard diagrams, or chart-like elements.
 3. Size the fallback to satisfy `visual_focus`; it should be a real page element, not a tiny decoration.
 4. Keep text-density limits. Do not compensate for missing assets by adding long bullet text.
 5. After creation, fetch the presentation and verify asset pages are not blank and that each planned fallback is visible when no real asset was used.

skills/lark-slides/references/lark-slides-replace-slide.md

@@ -88,10 +88,11 @@ lark-cli slides +replace-slide --as user \
 | `<table>` | 表格 | 整表替换会**重建内部 td id**，旧 td block_id 立即失效 |
 | `<td>` | 单元格局部替换 | 只能 `block_replace`，不能 `block_insert`；`block_id` 必须是最新 `slide.get` 拿到的 td id |
 | `<chart>` | 图表（line/bar/column/pie/area/radar/combo） | 必须嵌 `<chartPlotArea>` + `<chartData>` + `<dim1>/<dim2>/<chartField>` |
+| `<whiteboard>` | 画板（SVG 或 Mermaid） | 内嵌 `<svg>` 或 `<mermaid>`；`slide.get` 返回结构不含内部数据，但可直接写完整新 XML 做 `block_replace` 覆盖；详见 [`lark-slides-whiteboard.md`](lark-slides-whiteboard.md) |
 
 **不可作为根元素**：
 
-- `<video>` / `<audio>` / `<whiteboard>` —— SML 2.0 没有这三个原生元素；`<undefined type="video|audio|whiteboard">` 是**导出时**的占位符（服务端遇到不支持的类型时用它代替），**不能写入**。尝试 insert/replace 都会返回 3350001。
+- `<video>` / `<audio>` —— SML 2.0 没有这两个原生元素；`<undefined type="video|audio">` 是**导出时**的占位符（服务端遇到不支持的类型时用它代替），**不能写入**。尝试 insert/replace 都会返回 3350001。
 
 ### 最小 XML 片段（JSON 嵌入时记得把 `"` 转义成 `\"`）