AUD-1552-01/02: the v1.55.2 boot-veil audit findings, fixed with regressions

The v1.55.2 recheck (verdict NEEDS FIX) found two lifecycle holes in the
first-open boot veil (HP-1552); both are closed here and covered by
demo/smoke_preloader_lifecycle.mjs, which fails on v1.55.2.

AUD-1552-01 (high): disconnect/reconnect while booting hid the plan
FOREVER. disconnectedCallback cleared the boot timer but kept its
truthy id, so 'updated()' never restarted the watcher. Now the id is
nulled on disconnect and connectedCallback restarts the whole veil
lifecycle: a fresh watch (fresh clock, BOOT_MAX_MS hard cap) while
booting, the tail timers when detached mid-fade or mid-grace.

AUD-1552-02 (medium): two equal reads at 200/400 ms revealed the plan
at ~400 ms, so HA chrome landing at 450+ ms jumped on a VISIBLE plan.
The veil now holds a full protective window (BOOT_MIN_MS=700 — the old
600 ms plus a frame-latency margin: a shift applied at ~590 ms only
materializes in the stage height a couple frames later) with 100 ms
sampling and trailing quiescence (BOOT_QUIET_MS=250 restarts on every
height change), capped by BOOT_MAX_MS=1200. After the reveal a short
soft grace (BOOT_SOFT_MS=1500, .stage.hpsettle) turns later passive
shifts into a 0.25 s height glide — the viewport ResizeObserver refits
the plan along the transition; deliberate height changes (_setMode into
an editor) cancel the grace so the plan never drifts under the pointer.
Reduced motion disables the glide.

Regressions (demo/smoke_preloader_lifecycle.mjs, all FAIL on v1.55.2):
- A: detach before the first tick -> reattach -> veil lifts within the
  cap, plan visible, no hpboot class, no zombie veil after a mid-fade
  remount either;
- B: parameterized layout shifts at 150/300/450/590 ms -> not a single
  frame shows the plan at a non-final stage height;
- C: a shift after the reveal glides (>=3 intermediate frames), no snap.

smoke_modes.mjs now strips the transient hpsettle class from its exact
stage-class assertions. Docs: CHANGELOG en+ru, STATUS.

package-lock.json

@@ -1,12 +1,12 @@
 {
   "name": "houseplan-card",
-  "version": "1.55.2",
+  "version": "1.55.3",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "houseplan-card",
-      "version": "1.55.2",
+      "version": "1.55.3",
       "license": "MIT",
       "dependencies": {
         "lit": "^3.1.3",