ux v1.37.1: open-wall tool hover — default cursor, pointer + stretch preview near walls

- _openWallHit shared by click and hover; amber dashed preview of the
  stretch that would open, red solid when the click would close it;
  stage.wallhot drives the pointer cursor
- smoke_openwall_hover.mjs (9 checks); TESTING/CHANGELOG same-commit

custom_components/houseplan/manifest.json

@@ -16,5 +16,5 @@
   "issue_tracker": "https://github.com/Matysh/houseplan-card/issues",
   "requirements": [],
   "single_config_entry": true,
-  "version": "1.37.0"
+  "version": "1.37.1"
 }