chore: land tree view-state, vault, Pi module split, and repo hygiene

Persist PageTree expand state via control-plane view-state and align
chevron/DOM with restored expansion; keep Sidex-style shallow page-tree
scan and drop the unused recursive scanner that only added cargo noise.

Add password vault workbench routes/runtime/skill/CLI, split page_ai_pi
into a module package, and retire Hermes/ACP/OpenHub recycle + root
harness evidence from the index while gitignoring recycle and local
diag dumps.

Archive superseded design/bugs docs under old/, point architecture at
ARCHITECTURE.md, and refresh smokes for Pi S1–S7, vault, and editor
regressions so the working tree can stay clean.

rust/crates/mnote-web/browser/document-tiptap-conversion-runtime.js

@@ -389,6 +389,21 @@ export const localMarkdownRelativePathFromDocumentId = (documentId) => {
   return decodeLocalIdSegment(segment).replace(/^\/+/, '');
 };
 
+export const localMarkdownRelativePathFromDocumentsHref = (href) => {
+  const value = String(href || '').trim();
+  if (!value) return '';
+  let url = null;
+  try {
+    url = new URL(value, window.location?.origin || 'http://127.0.0.1:3000');
+  } catch (_) {
+    return '';
+  }
+  if (!url.pathname.startsWith('/documents/')) return '';
+  const segment = decodeURIComponent(url.pathname.slice('/documents/'.length));
+  if (!segment.startsWith('local-md:')) return '';
+  return localMarkdownRelativePathFromDocumentId(segment);
+};
+
 export const localMarkdownDocumentIdFromRelativePath = (relativePath) => {
   const normalized = String(relativePath || '').trim().replace(/^\/+/, '');
   if (!normalized) return '';
@@ -440,7 +455,12 @@ export const normalizeLocalPageRelativePath = (value, context) => {
   if (!text || text.startsWith('#')) return '';
   if (text.startsWith('/documents/')) return text;
   if (text.startsWith('/api/') || text.startsWith('http://') || text.startsWith('https://') || text.startsWith('mailto:')) return '';
-  const baseDir = text.startsWith('/') ? '' : localMarkdownDirectoryFromDocumentId(context?.documentId);
+  const currentPath = localMarkdownRelativePathFromDocumentId(context?.documentId);
+  const textPath = text.replace(/^\/+/, '');
+  const currentTop = currentPath.split('/').filter(Boolean)[0] || '';
+  const textTop = textPath.split('/').filter(Boolean)[0] || '';
+  const looksRootRelative = Boolean(currentTop && textTop && currentTop === textTop);
+  const baseDir = text.startsWith('/') || looksRootRelative ? '' : localMarkdownDirectoryFromDocumentId(context?.documentId);
   const parts = (baseDir ? `${baseDir}/${text}` : text)
     .replace(/\\/g, '/')
     .split('/');
@@ -752,6 +772,32 @@ export const tiptapNodeToEditorBlock = (node, index) => {
       childBlockIds: [],
     };
   }
+  if (node?.type === 'paragraph') {
+    const children = Array.isArray(node?.content) ? node.content : [];
+    if (children.length === 1 && children[0]?.type === 'text') {
+      const textNode = children[0];
+      const linkMark = Array.isArray(textNode.marks)
+        ? textNode.marks.find((mark) => {
+          const className = String(mark?.attrs?.class || '');
+          return mark?.type === 'link' && className.split(/\s+/).includes('mnote-page-block-link');
+        })
+        : null;
+      if (linkMark?.attrs?.href) {
+        const href = String(linkMark.attrs.href || '').trim();
+        const sourcePath = localMarkdownRelativePathFromDocumentsHref(href) || unwrapMarkdownLinkTarget(href);
+        return {
+          blockId,
+          blockType: 'page_reference',
+          props: {
+            title: String(textNode.text || '').trim() || '页面',
+            sourcePath,
+          },
+          contentNodes: inlineTextNodes(node),
+          childBlockIds: [],
+        };
+      }
+    }
+  }
   if (node?.type === 'paragraph') return { blockId, blockType: 'paragraph', props: {}, contentNodes: inlineTextNodes(node), childBlockIds: [] };
   if (node?.type === 'heading') {
     const level = Math.max(1, Math.min(6, Number(node?.attrs?.level || 1) || 1));
@@ -795,6 +841,11 @@ export const legacyBlocksFromEditorDocument = (editorDocument) => (
         ? { language: block.props?.language || null }
       : block.blockType === 'mindmap'
           ? mindmapPropsFromAttrs(block.props || {}, block.blockId)
+        : block.blockType === 'page_reference'
+          ? {
+            title: block.props?.title || flattenText(block.contentNodes || []) || '页面',
+            sourcePath: block.props?.sourcePath || block.props?.source_path || block.props?.href || '',
+          }
         : block.blockType === 'image'
           ? { ...(block.props || {}) }
           : block.blockType === 'toc'