feat(sacred-valley): hybrid free/snap canvas + blank & blackflame cards (2.8.0)

Replace masonry grid with an absolute-positioned 12-col canvas: drag to
move, corner to resize, per-card free/overlap toggle (Alt = no-snap).
Geometry persisted (migration 027: dashboard_layout.geom + extras).
Two new addable decorative cards: blank spacer + animated blackflame
(canvas particle flame). Old layout auto-migrates by flow-placement.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

package-lock.json

@@ -1,12 +1,12 @@
 {
   "name": "void-server",
-  "version": "2.7.0",
+  "version": "2.8.0",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "void-server",
-      "version": "2.7.0",
+      "version": "2.8.0",
       "dependencies": {
         "@modelcontextprotocol/sdk": "^1.29.0",
         "@mozilla/readability": "^0.6.0",