fix: end a tab drag when the card is disconnected

Review CODE-REVIEW-220-r2/r3, F1.

The M1 fix installs window listeners for the length of the gesture, and
disconnectedCallback — which takes down everything else, down to the other
local gesture — did not take those down. Losing the card mid-drag (Lovelace
rebuilding its tree, the user leaving the view with the button still down)
left them alive: the closure holds the instance and its config, and the next
pointerup anywhere on the page would have an invisible card write its order.

The smoke now holds a tab, removes the card, and checks that the release it
should no longer hear changes nothing. Registered as a mutant too.

Issue: #220
User-Visible: no

src/houseplan-card.ts

@@ -2236,6 +2236,13 @@ class HouseplanCard extends LitElement {
     this._bootSettling = false;
     for (const rt of this._activityRt.values()) clearTimeout(rt.timer); // pending activity-window repaints
     window.removeEventListener('keydown', this._keyHandler);
+    // A tab drag holds window listeners for the length of the gesture. Losing
+    // the card mid-drag — Lovelace rebuilding its tree, the user leaving the
+    // view with the button still down — would leave them alive: the closure
+    // keeps this instance (and its config) from being collected, and the next
+    // pointerup anywhere on the page would make an invisible card write its
+    // order (review CODE-REVIEW-220-r2/r3, F1).
+    this._endTabDrag();
     clearInterval(this._cycleTimer);
     clearTimeout(this._kioskDotsTimer);
     clearTimeout(this._kioskHoldTimer);