feat(mindspace): 悬浮聊天勾选资料联动、UI 与交互优化

勾选单个文件时 Agent 获知上下文并主动问候；打开悬浮窗使用新会话。
统一弹窗浅色主题、固定高度与输入区布局，支持点击外部收起。

Co-authored-by: Cursor <cursoragent@cursor.com>

mindspace-chat-context.mjs

@@ -63,6 +63,75 @@ function resolvePageRecord(selectedPageId, pages, pageLive) {
   };
 }
 
+function normalizeSelectedAsset(asset) {
+  if (!asset?.id) return null;
+  return {
+    id: asset.id,
+    displayName: asset.displayName ?? asset.filename ?? asset.id,
+    mimeType: asset.mimeType ?? 'application/octet-stream',
+    ...(asset.filename ? { filename: asset.filename } : {}),
+    ...(typeof asset.sizeBytes === 'number' ? { sizeBytes: asset.sizeBytes } : {}),
+    ...(asset.categoryCode ? { categoryCode: asset.categoryCode } : {}),
+    ...(asset.assetType ? { assetType: asset.assetType } : {}),
+  };
+}
+
+function inferAssetKindLabel(asset) {
+  const mime = String(asset?.mimeType ?? '').toLowerCase();
+  const name = String(asset?.displayName ?? asset?.filename ?? '').toLowerCase();
+  if (mime.startsWith('image/')) return '图片';
+  if (
+    mime.includes('spreadsheet') ||
+    mime.includes('csv') ||
+    name.endsWith('.xlsx') ||
+    name.endsWith('.xls') ||
+    name.endsWith('.csv')
+  ) {
+    return '数据表';
+  }
+  if (mime.includes('pdf') || name.endsWith('.pdf')) return '报告';
+  if (mime.includes('word') || name.endsWith('.doc') || name.endsWith('.docx')) return '文档';
+  if (mime.startsWith('text/')) return '文本资料';
+  return '文件';
+}
+
+function buildSelectedAssetInstructions(context) {
+  const selected = context.selectedAssets ?? [];
+  if (selected.length === 0) return [];
+
+  const lines = ['【界面勾选资料（硬性）】'];
+  if (selected.length === 1) {
+    const asset = selected[0];
+    const kind = inferAssetKindLabel(asset);
+    lines.push(
+      `- 用户在界面勾选了 1 份${kind}：「${asset.displayName}」（id: ${asset.id}，${asset.mimeType}）`,
+      '- 用户说「这个 / 这份 / 这篇 / 这份报告 / 这个数据 / 帮我分析 / 帮我删除」等指代词时，**必须**指这份勾选资料，不得猜测其它文件。',
+      `- 读取/下载：GET /api/mindspace/v1/assets/${asset.id}/download`,
+      `- 删除：DELETE /api/mindspace/v1/assets/${asset.id}（执行删除前必须向用户确认）`,
+    );
+    if (context.h5ApiBase) {
+      lines.push(`- H5 API 基址：${context.h5ApiBase}`);
+    }
+  } else {
+    lines.push(`- 用户在界面同时勾选了 ${selected.length} 份资料：`);
+    for (const asset of selected) {
+      lines.push(`  · 「${asset.displayName}」（id: ${asset.id}，${asset.mimeType}）`);
+    }
+    lines.push(
+      '- 用户说「这个 / 这份」等指代词时，**必须先追问**要处理哪一份，不得擅自选一份执行。',
+      '- 不要主动对多选资料发起默认操作；等用户明确指定后再执行。',
+    );
+  }
+  lines.push('');
+  return lines;
+}
+
+export function buildSelectedAssetGreeting(asset) {
+  const kind = inferAssetKindLabel(asset);
+  const name = asset.displayName ?? asset.filename ?? '这份资料';
+  return `我看到你在界面里勾选了「${name}」。你是想查看或处理这份${kind}吗？可以直接说「帮我分析」「总结一下」或「帮我删除」——我会针对这份资料来操作。`;
+}
+
 export function buildMindSpaceChatContext(input) {
   const {
     space,
@@ -72,6 +141,7 @@ export function buildMindSpaceChatContext(input) {
     pages = [],
     pageLive = null,
     assets = [],
+    selectedAssets = [],
     focusedAsset = null,
     route,
     agentSessionId = null,
@@ -87,6 +157,14 @@ export function buildMindSpaceChatContext(input) {
   if (pageRecord && selectedPageId) view = 'page';
   else if (selectedCategory) view = 'category';
 
+  const normalizedSelected = selectedAssets
+    .map((asset) => normalizeSelectedAsset(asset))
+    .filter(Boolean);
+  const resolvedFocus =
+    normalizedSelected.length === 1
+      ? normalizedSelected[0]
+      : normalizeSelectedAsset(focusedAsset);
+
   const context = {
     spaceId: space.id,
     spaceName: space.name,
@@ -135,13 +213,14 @@ export function buildMindSpaceChatContext(input) {
           },
         }
       : {}),
-    ...(focusedAsset
+    ...(resolvedFocus
       ? {
-          focusedAsset: {
-            id: focusedAsset.id,
-            displayName: focusedAsset.displayName,
-            mimeType: focusedAsset.mimeType,
-          },
+          focusedAsset: resolvedFocus,
+        }
+      : {}),
+    ...(normalizedSelected.length
+      ? {
+          selectedAssets: normalizedSelected,
         }
       : {}),
   };
@@ -175,6 +254,14 @@ function buildLocationHint(context) {
   if (context.page) {
     return `用户正在查看/编辑页面「${context.page.title}」（id: ${context.page.id}）。指代「这个页面」「改这里」时默认指该页面。`;
   }
+  if (context.selectedAssets?.length === 1) {
+    const asset = context.selectedAssets[0];
+    const kind = inferAssetKindLabel(asset);
+    return `用户在界面勾选了${kind}「${asset.displayName}」（id: ${asset.id}）。指代「这个文件」「这份报告」「这个数据」时**必须**指该勾选资料。`;
+  }
+  if (context.selectedAssets?.length > 1) {
+    return `用户在界面同时勾选了 ${context.selectedAssets.length} 份资料。指代「这个 / 这份」时必须先让用户说明要处理哪一份。`;
+  }
   if (context.focusedAsset) {
     return `用户正在处理资料「${context.focusedAsset.displayName}」（id: ${context.focusedAsset.id}）。指代「这个文件」「这份资料」时默认指该资产。`;
   }
@@ -274,6 +361,8 @@ export function buildContextPrefix(context) {
     );
   }
 
+  lines.push(...buildSelectedAssetInstructions(context));
+
   if (context.homeCategories?.length) {
     lines.push('- 空间分类概览：');
     for (const item of context.homeCategories) {
@@ -304,6 +393,12 @@ export function formatContextChip(context) {
       typeof context.page.versionNo === 'number' ? ` · v${context.page.versionNo}` : '';
     return `编辑 · ${context.page.title}${version}`;
   }
+  if (context.selectedAssets?.length === 1) {
+    return `已选 · ${context.selectedAssets[0].displayName}`;
+  }
+  if (context.selectedAssets?.length > 1) {
+    return `已选 ${context.selectedAssets.length} 项资料`;
+  }
   if (context.page) {
     const version =
       typeof context.page.versionNo === 'number' ? ` · v${context.page.versionNo}` : '';
@@ -320,4 +415,6 @@ export function formatContextChip(context) {
 export const mindspaceChatContextInternals = {
   stripHtml,
   excerptContent,
+  inferAssetKindLabel,
+  normalizeSelectedAsset,
 };