feat(workspace): mark several notes (Ctrl/Cmd, Shift) and drag them into a folder or onto the trash

Ctrl/Cmd+click toggles, Shift+click marks a range in the order shown; dragging a marked note takes
all marked ones along (no merge then). The trash at the bottom of the sidebar becomes a drop target,
also for a single note and on phones (native long-press drag); a toast offers undo. Escape, a plain
click or a click on empty space clears the marks. v0.37.0.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

frontend/package-lock.json

@@ -1,12 +1,12 @@
 {
   "name": "mindsift-frontend",
-  "version": "0.36.0",
+  "version": "0.37.0",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "mindsift-frontend",
-      "version": "0.36.0",
+      "version": "0.37.0",
       "license": "Unlicense",
       "dependencies": {
         "@fontsource-variable/inter": "5.3.0",