search: right-click a hit to move it to a bucket

Drag was the only way to move a search hit into a bucket, which meant
opening the main board to find a drop target first. Right-click on a
search-hit now opens a small bucket picker anchored at the cursor:
clicking a bucket PATCHes the card's bucket_id and re-runs the
current search so the row updates in place. Includes an "(unsorted)"
entry that clears the bucket.

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

electron/package.json

@@ -1,6 +1,6 @@
 {
   "name": "hyprcrd",
-  "version": "1.9.15",
+  "version": "1.9.16",
   "description": "hyprcrd — self-hosted card manager",
   "main": "main.js",
   "scripts": {