tooltip: kill stuck tips with watchdog + pointermove sanity

Tooltips could strand on screen when pointerleave didn't fire — fast
flicks off the target, re-renders that yanked the element out mid-
hover, or the tab losing focus. Three guards:

  - 5s max-life watchdog on every show, so the worst case is a late
    fade rather than a permanent overlay
  - pointermove check: if the pointer is no longer over the tip's
    owning target (or the target got detached from the DOM), hide
  - window blur + visibilitychange also hide immediately

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', '1.9.12');
+define('APP_VERSION', '1.9.13');
 
 // Database path — writable directory, outside webroot
 // DB_PATH / UPLOAD_DIR can be pre-defined by the Electron router for app isolation