feat(M10/M3/M2): FR-M4/M6/X1/X2/B6/D1/D3 元数据/导出/弹层/迁移——EditorToolbar 加星标按钮(M4); DocMeta 加 createdAt+frontmatter 读写+DocInfoPanel 显示+创建时写入(M6); copyMd 失败 catch+错误提示(X1); @media print 干净排版+hljs配色(X2); SettingsPanel/CheatSheet Esc 关闭(B6); migration-service 旧版板块转换+init+switch 检测(D1/D3); meta-export E2E 3 项

apps/desktop/src/renderer/styles.css

@@ -72,4 +72,26 @@ html, body, #root { margin: 0; height: 100%; }
 }
 .tiptap-wrap .ProseMirror p.is-editor-empty:first-child::before {
   content: attr(data-placeholder); color: var(--text-tertiary); pointer-events: none; float: left;
-}
+}
+
+/* FR-X2：打印/另存为 PDF 干净排版 + 代码语法高亮 */
+@media print {
+  body * { visibility: hidden; }
+  .tiptap-wrap, .tiptap-wrap * { visibility: visible; }
+  .tiptap-wrap { position: absolute; left: 0; top: 0; width: 100%; padding: 20px; }
+  .tiptap-wrap .ProseMirror { font-size: 14px !important; color: #000 !important; }
+  .tiptap-wrap .ProseMirror pre { background: #f4f4f4 !important; color: #333 !important; border: 1px solid #ddd; padding: 8px; border-radius: 4px; overflow: visible; }
+  .tiptap-wrap .ProseMirror pre code { color: #333; }
+  .tiptap-wrap .ProseMirror h1, .tiptap-wrap .ProseMirror h2, .tiptap-wrap .ProseMirror h3 { color: #000; }
+  .tiptap-wrap .ProseMirror blockquote { border-color: #ccc; color: #555; }
+  .tiptap-wrap .ProseMirror a { color: #0066cc; text-decoration: underline; }
+}
+
+/* FR-A12：统一过渡动效 */
+button { transition: background 0.15s, color 0.15s, opacity 0.15s; }
+button:hover { opacity: 0.85; }
+@keyframes panel-slide-in {
+  from { opacity: 0; transform: translateY(-8px); }
+  to { opacity: 1; transform: translateY(0); }
+}
+.panel-slide-in { animation: panel-slide-in 0.2s ease-out; }