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>

config.php

@@ -1,7 +1,7 @@
 <?php
 
 define('APP_NAME', 'hyprcrd');
-define('APP_VERSION', '1.9.15');
+define('APP_VERSION', '1.9.16');
 
 // Database path — writable directory, outside webroot
 // DB_PATH / UPLOAD_DIR can be pre-defined by the Electron router for app isolation