Feat v0.4.3 backlinks wikilinks

Obsidian-style [[wikilinks]] for the notes surface. New ext_notes_links
table (source_id, target_id, link_text) with bidirectional indexes.

Backend: _extract_wikilinks() parses [[...]] via split (no regex in
Starlark). _sync_links() on create/update resolves titles to note IDs.
Cascade delete cleans both directions. GET /links/:id and
GET /backlinks/:id endpoints.

Frontend: wikilinks render as clickable links in preview — blue for
resolved, red for unresolved. Clicking resolved navigates; clicking
unresolved creates the note and re-saves source to resolve the link.
BacklinksPanel shows incoming links below editor with click navigation.

Notes package 0.3.0 → 0.4.0.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

packages/notes/js/main.js

@@ -1,5 +1,5 @@
 /**
- * Notes — Surface Entry Point (v0.3.0)
+ * Notes — Surface Entry Point (v0.4.0)
  *
  * Markdown notes surface using the SDK:
  *   sw.api.ext('notes')  — scoped API client
@@ -138,6 +138,10 @@
     s = s.replace(/_(.+?)_/g, '<em>$1</em>');
     // links
     s = s.replace(/\[([^\]]+)\]\(([^)]+)\)/g, '<a href="$2" target="_blank" rel="noopener">$1</a>');
+    // wikilinks: [[Note Title]] → clickable internal link
+    s = s.replace(/\[\[([^\]]+)\]\]/g, function(match, linkText) {
+      return '<a class="wikilink" data-wikilink="' + linkText.trim() + '" href="#">' + linkText.trim() + '</a>';
+    });
     return s;
   }
 
@@ -490,17 +494,57 @@
   }
 
 
+  // ═══════════════════════════════════════════
+  //  BacklinksPanel — incoming wikilinks
+  // ═══════════════════════════════════════════
+
+  function BacklinksPanel({ noteId, onNavigate }) {
+    var [backlinks, setBacklinks] = useState([]);
+    var [collapsed, setCollapsed] = useState(false);
+
+    useEffect(function() {
+      if (!noteId) { setBacklinks([]); return; }
+      api.get('/backlinks/' + noteId).then(function(res) {
+        var items = (res && res.data) || res || [];
+        setBacklinks(Array.isArray(items) ? items : []);
+      }).catch(function() { setBacklinks([]); });
+    }, [noteId]);
+
+    if (!backlinks.length) return null;
+
+    return html`
+      <div class="backlinks-panel">
+        <div class="backlinks-panel__header" onClick=${function() { setCollapsed(!collapsed); }}>
+          <span class="backlinks-panel__toggle">${collapsed ? '▶' : '▼'}</span>
+          <span>Backlinks</span>
+          <span class="backlinks-panel__count">${backlinks.length}</span>
+        </div>
+        ${!collapsed && backlinks.map(function(bl) {
+          return html`
+            <div key=${bl.source_id} class="backlinks-panel__item"
+                 onClick=${function() { if (onNavigate) onNavigate(bl.source_id); }}>
+              <span class="backlinks-panel__title">${bl.source_title}</span>
+              <span class="backlinks-panel__context">via [[${bl.link_text}]]</span>
+            </div>
+          `;
+        })}
+      </div>
+    `;
+  }
+
+
   // ═══════════════════════════════════════════
   //  EditorPane — note editor + preview + tags
   // ═══════════════════════════════════════════
 
-  function EditorPane({ note, folders, allTags, onSave, onDelete, onRefresh, onTagsChanged }) {
+  function EditorPane({ note, folders, allTags, onSave, onDelete, onRefresh, onTagsChanged, onNavigate, onNavigateToTitle }) {
     var [title, setTitle]     = useState(note ? note.title : '');
     var [body, setBody]       = useState(note ? note.body : '');
     var [noteTags, setNoteTags] = useState([]);
     var [preview, setPreview] = useState(false);
     var [dirty, setDirty]     = useState(false);
     var [saving, setSaving]   = useState(false);
+    var [saveCount, setSaveCount] = useState(0);
     var textareaRef = useRef(null);
 
     // sync when note changes
@@ -532,6 +576,7 @@
       try {
         await api.put('/notes/' + note.id, { title: t || 'Untitled', body: b });
         setDirty(false);
+        setSaveCount(function(c) { return c + 1; });
         onRefresh();
       } catch (e) {
         console.error('Save failed:', e);
@@ -584,7 +629,46 @@
       }
     }
 
-    var previewHtml = useMemo(function() { return renderMarkdown(body); }, [body]);
+    // ── Outgoing links for resolved/unresolved styling ──
+    var [outgoingLinks, setOutgoingLinks] = useState([]);
+    useEffect(function() {
+      if (!note) { setOutgoingLinks([]); return; }
+      api.get('/links/' + note.id).then(function(res) {
+        var items = (res && res.data) || res || [];
+        setOutgoingLinks(Array.isArray(items) ? items : []);
+      }).catch(function() { setOutgoingLinks([]); });
+    }, [note ? note.id : null, saveCount]);
+
+    var previewHtml = useMemo(function() {
+      var h = renderMarkdown(body);
+      // mark unresolved wikilinks
+      for (var i = 0; i < outgoingLinks.length; i++) {
+        var link = outgoingLinks[i];
+        if (!link.target_id) {
+          var search = 'class="wikilink" data-wikilink="' + escHtml(link.link_text) + '"';
+          var replace = 'class="wikilink wikilink--unresolved" data-wikilink="' + escHtml(link.link_text) + '"';
+          h = h.split(search).join(replace);
+        }
+      }
+      return h;
+    }, [body, outgoingLinks]);
+
+    // ── Wikilink click handling in preview ──
+    var previewRef = useRef(null);
+    useEffect(function() {
+      var el = previewRef.current;
+      if (!el || !preview) return;
+      function handleClick(e) {
+        var target = e.target;
+        if (target.classList && target.classList.contains('wikilink')) {
+          e.preventDefault();
+          var linkText = target.getAttribute('data-wikilink');
+          if (linkText && onNavigateToTitle) onNavigateToTitle(linkText);
+        }
+      }
+      el.addEventListener('click', handleClick);
+      return function() { el.removeEventListener('click', handleClick); };
+    }, [preview, onNavigateToTitle]);
 
     // build indented folder list for the select dropdown
     var folderOptions = useMemo(function() {
@@ -660,13 +744,14 @@
         <${TagInput} tags=${noteTags} allTags=${allTags} onChange=${handleTagsChange} />
         <div class="notes-editor__body">
           ${preview
-            ? html`<div class="notes-preview" dangerouslySetInnerHTML=${{ __html: previewHtml }} />`
+            ? html`<div class="notes-preview" ref=${previewRef} dangerouslySetInnerHTML=${{ __html: previewHtml }} />`
             : html`<textarea class="notes-editor__textarea" ref=${textareaRef}
                       value=${body} onInput=${handleBodyChange}
                       onKeyDown=${handleKeyDown}
                       placeholder="Start writing in Markdown…" />`
           }
         </div>
+        <${BacklinksPanel} noteId=${note.id} onNavigate=${onNavigate} />
       </div>
     `;
   }
@@ -866,6 +951,41 @@
       } catch (e) { console.error('Delete folder failed:', e); }
     }
 
+    // ── Wikilink navigation by title ─────────
+    async function handleNavigateToTitle(title) {
+      try {
+        var res = await api.get('/search?q=' + encodeURIComponent(title.trim()));
+        var items = (res && res.data) || res || [];
+        if (!Array.isArray(items)) items = [];
+        var match = null;
+        for (var i = 0; i < items.length; i++) {
+          if ((items[i].title || '').toLowerCase().trim() === title.toLowerCase().trim()) {
+            match = items[i];
+            break;
+          }
+        }
+        if (match) {
+          handleSelect(match.id);
+        } else {
+          // create the note and navigate to it
+          var sourceId = activeId;
+          var newNote = await api.post('/notes', { title: title.trim(), body: '' });
+          if (newNote && newNote.id) {
+            // re-save source note so _sync_links resolves the new target
+            if (sourceId && activeNote) {
+              await api.put('/notes/' + sourceId, { body: activeNote.body || '' });
+            }
+            setActiveId(newNote.id);
+            loadNote(newNote.id);
+            loadNotes();
+            loadStats();
+          }
+        }
+      } catch (e) {
+        console.error('Navigate to title failed:', e);
+      }
+    }
+
     // ── Search ────────────────────────────────
     function handleSearch(e) {
       var val = e.target.value;
@@ -916,7 +1036,9 @@
           onSave=${handleRefresh}
           onDelete=${handleDelete}
           onRefresh=${handleRefresh}
-          onTagsChanged=${handleTagsChanged} />
+          onTagsChanged=${handleTagsChanged}
+          onNavigate=${handleSelect}
+          onNavigateToTitle=${handleNavigateToTitle} />
       </div>
     `;
   }