Feat v0.4.7 note graph

Canvas force-directed graph view for notes surface. GET /graph API
endpoint returns all non-archived notes as nodes (with tags) and
resolved wikilinks as edges. Force simulation with repulsion,
attraction, and center gravity. Click focus dims unconnected nodes,
shift+click chains neighborhoods, double-click opens note. Hover
tooltips show title, tags, and connection count. Nodes colored by
folder (10-color palette), tag filter dims non-matching. Orphan
nodes shown with dashed stroke and hide toggle. Zoom/pan via scroll
wheel and mouse drag. Retina-aware canvas rendering with CSS
variable resolution via getComputedStyle.

Notes package 0.7.0 → 0.8.0.

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

packages/notes/manifest.json

@@ -6,9 +6,9 @@
   "route": "/s/notes",
   "auth": "authenticated",
   "layout": "single",
-  "version": "0.7.0",
+  "version": "0.8.0",
   "icon": "📝",
-  "description": "Markdown notes surface with rich editor, folders, tags, backlinks, import/export, sidebar tabs, and document outline.",
+  "description": "Markdown notes surface with rich editor, folders, tags, backlinks, import/export, sidebar tabs, document outline, and note graph.",
   "author": "switchboard",
 
   "permissions": ["db.write"],
@@ -21,6 +21,7 @@
     {"method": "DELETE", "path": "/notes/*"},
     {"method": "GET",    "path": "/search"},
     {"method": "GET",    "path": "/stats"},
+    {"method": "GET",    "path": "/graph"},
     {"method": "GET",    "path": "/folders"},
     {"method": "POST",   "path": "/folders"},
     {"method": "PUT",    "path": "/folders/*"},