fix(bookmarks): sync local state on save so columns persist

save() PATCHed the card on the server but left state.cards stale.
The next openOverlay read the old body from the local cache and
the new column was gone. Now save() writes the updated body back
into the matching state.cards entry so close + reopen sees the
latest data without a full _reloadAll round-trip.

Test: "new columns survive close + reopen" — adds a column via
API + local state update, closes, reopens, asserts both column
names are present in the DOM.

Bumps to 1.9.28.

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', '1.9.27');
+define('APP_VERSION', '1.9.28');
 
 // Database path — writable directory, outside webroot
 // DB_PATH / UPLOAD_DIR can be pre-defined by the Electron router for app isolation