fix v1.44.2: external review CR-1..CR-3

CR-1: the lock invariant is restated precisely (never by an accidental
tap; the door card's labeled button is the ONE sanctioned surface),
unlocking now confirms, and smoke_lock_invariant exercises all five
actuation paths (icon tap, controls[], card entities, _cardToggle,
opening card).

CR-2: attachment migration is transactional — the server COPIES files,
the config is committed with its revision check, and only then the old
folder is removed via the new houseplan/files/cleanup. A rejected save
no longer leaves the stored urls pointing at an emptied folder.

CR-3: migrate returns an exact {source: written} mapping; only confirmed
copies are rewritten, destination name collisions get a unique name
instead of silently linking a pre-existing file, and a failed migration
raises a toast instead of being swallowed.

+1 unit test (119), +1 backend test, +1 smoke (51 total); docs
same-commit

package.json

@@ -1,6 +1,6 @@
 {
   "name": "houseplan-card",
-  "version": "1.44.1",
+  "version": "1.44.2",
   "description": "Interactive house plan Lovelace card for Home Assistant",
   "license": "MIT",
   "type": "module",