feat(frontend): 完善工作区导航与笔记属性并适配手帐主题

frontend/src/features/workspace/outline.ts

@@ -0,0 +1,20 @@
+import { marked } from 'marked'
+import { splitNoteMetadata } from '../editor/noteMetadata'
+
+export interface OutlineHeading { index: number; level: number; title: string; offset: number }
+
+export function noteOutline(source: string): OutlineHeading[] {
+  const headings: OutlineHeading[] = []
+  const metadata = splitNoteMetadata(source)
+  let offset = metadata?.prefix.length ?? 0
+  let headingIndex = 0
+  for (const token of marked.lexer(metadata?.body ?? source)) {
+    const start = source.indexOf(token.raw, offset)
+    if (token.type === 'heading') {
+      const index = headingIndex++
+      headings.push({ index, level: token.depth, title: token.text.replace(/[*_`]/g, ''), offset: Math.max(0, start) })
+    }
+    if (start >= 0) offset = start + token.raw.length
+  }
+  return headings
+}