editor: new appointments never inherit the active bucket

The modal's default-bucket logic dropped new cards into the current
real bucket when opened from one. Calendar-created appointments
(body pre-seeded with #termin / #geburtstag) would then land in e.g.
"work" instead of living bucket-less as calendar entries should.
Detect the pre-filled tag on open and force inpBucket empty for
those; regular new cards still inherit the active 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', '1.9.16');
+define('APP_VERSION', '1.9.17');
 
 // Database path — writable directory, outside webroot
 // DB_PATH / UPLOAD_DIR can be pre-defined by the Electron router for app isolation