Assert the panel motion contract and hard rules, not just build them

The confirm dialog (fade + scale .96->1 over --nq-dur-modal/--nq-ease-out),
the seal (fade + scale 1.15->1 over --nq-dur-base), the quest-complete
12 s countdown return and the 40 s idle return already matched
PANEL-SPEC, but nothing pinned them: a token or keyframe edit could
silently drift the panel off the approved mockup timing.

tests/test_panel_cards.py now asserts the entrance timing and easing,
the byte-identical served token copy, and the section 1/6 hard rules
(22px body floor, token-only inks, no hover states, no animation loops,
inert dock strip, whole-plate tap target, control-free away plate), and
the quest-log harness drives the 1c countdown return end-to-end against
the bundle HACS ships.

frontend/tests/render-quest-log.mjs

@@ -3,12 +3,15 @@
  *
  * Usage: node render-quest-log.mjs < spec.json
  *
- * The spec JSON carries {bundle, url, config, hass, idle_ms?}; the card is
- * mounted at the given URL (it resolves its child from the pathname's last
- * segment), and after the optional idle wait stdout receives one JSON object
- * {location, headline, html} — the window pathname and the rendered title.
- * The Python panel tests drive this harness so the assertions run against
- * the exact bundle HACS ships.
+ * The spec JSON carries {bundle, url, config, hass, idle_ms?, probe_ms?};
+ * the card is mounted at the given URL (it resolves its child from the
+ * pathname's last segment), after the optional probe wait one snapshot of
+ * the render is taken mid-wait, then after the optional idle wait stdout
+ * receives one JSON object {location, headline, countdown, html, probe} —
+ * the final window pathname, the rendered title, the complete-screen
+ * countdown text, the rendered shadow DOM, and the probe snapshot when
+ * probe_ms was given. The Python panel tests drive this harness so the
+ * assertions run against the exact bundle HACS ships.
  */
 import { readFileSync } from "node:fs";
 import { pathToFileURL } from "node:url";
@@ -46,14 +49,25 @@ element.hass = spec.hass;
 document.body.appendChild(element);
 await element.updateComplete;
 
+const snapshot = () => ({
+  location: window.location.pathname,
+  headline: element.shadowRoot.querySelector(".title")?.textContent?.trim() ?? "",
+  countdown:
+    element.shadowRoot.querySelector(".complete-countdown")?.textContent?.trim() ??
+    "",
+  html: element.shadowRoot.innerHTML,
+});
+
+let probe = null;
+if (spec.probe_ms !== undefined) {
+  await new Promise((resolve) => setTimeout(resolve, spec.probe_ms));
+  probe = snapshot();
+}
+
 if (spec.idle_ms !== undefined) {
   await new Promise((resolve) => setTimeout(resolve, spec.idle_ms));
 }
 
-const payload = JSON.stringify({
-  location: window.location.pathname,
-  headline: element.shadowRoot.querySelector(".title")?.textContent?.trim() ?? "",
-  html: element.shadowRoot.innerHTML,
-});
+const payload = JSON.stringify({ ...snapshot(), probe });
 await new Promise((resolve) => process.stdout.write(payload, () => resolve()));
 process.exit(0);