fix(cms): stable bottom bar and self-save no longer trips the 409 lock

MITHOME-68: the optimistic-lock fingerprint was frozen at page load, so the
user's own second save 409'd. /save now returns the hash of the written
content and the client refreshes CONTENT_HASH on success — 409 only fires
for genuine external changes (deploy, other tab, restore). Also: successful
logins no longer consume the auth failure budget (only failed attempts do).

MITHOME-69: bottom bar items no longer shift while saving/publishing — the
status message occupies a constant flex slot (visibility instead of
display), the publish button locks its width while running and restores
its env-specific label, auto margins removed. Layout guard test added.

Test markers are now run-unique so a crashed run can never poison the
next one's expectations.

scripts/cms-editor-client.js

@@ -258,14 +258,17 @@ async function save() {
   const json = await res.json();
   const status = document.getElementById('saveStatus');
   if (json.ok) {
+    // Refresh the optimistic-lock fingerprint with the server-computed hash of
+    // the saved content, so the user's own subsequent saves don't trip 409.
+    if (json.contentHash) CONTENT_HASH = json.contentHash;
     status.textContent = '✅ Mentve!';
     status.style.color = '#10b981';
   } else {
     status.textContent = '❌ Hiba: ' + json.error;
     status.style.color = '#f87171';
   }
-  status.style.display = 'inline';
-  setTimeout(() => status.style.display = 'none', 3000);
+  status.style.visibility = 'visible';
+  setTimeout(() => status.style.visibility = 'hidden', 3000);
 }
 
 async function publish() {
@@ -274,7 +277,11 @@ async function publish() {
   
   // Save first
   await save();
-  
+
+  // WHY: lock the button width and remember the label so the running state
+  // neither resizes the bottom bar nor permanently swaps the env-specific label.
+  const originalLabel = btn.textContent;
+  btn.style.minWidth = btn.offsetWidth + 'px';
   btn.textContent = '⏳ Élesítés folyamatban...';
   btn.disabled = true;
   
@@ -295,10 +302,11 @@ async function publish() {
     status.style.color = '#f87171';
   }
   
-  btn.textContent = '🚀 Publikálás & Élesítés';
+  btn.textContent = originalLabel;
+  btn.style.minWidth = '';
   btn.disabled = false;
-  status.style.display = 'inline';
-  setTimeout(() => status.style.display = 'none', 5000);
+  status.style.visibility = 'visible';
+  setTimeout(() => status.style.visibility = 'hidden', 5000);
 }
 
 async function logout() {