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>

electron/package.json

@@ -1,6 +1,6 @@
 {
   "name": "hyprcrd",
-  "version": "1.9.12",
+  "version": "1.9.13",
   "description": "hyprcrd — self-hosted card manager",
   "main": "main.js",
   "scripts": {