test(cms): run-unique markers so a crashed run cannot poison the next

The versions integration test asserted against fixed marker strings; if a
run crashed before restoring contact.json, the next run read the polluted
file as its baseline and its expectations collapsed. Markers now carry a
per-run timestamp.

scripts/test-content-editor-versions.js

@@ -75,10 +75,11 @@ async function main() {
 
   try {
     // Create two saves → two backups of intermediate states
+    const runId = Date.now();
     const v1 = JSON.parse(original);
-    v1.hero.subtitle = 'Verzió teszt #1';
+    v1.hero.subtitle = 'Verzió teszt #1 ' + runId;
     const v2 = JSON.parse(original);
-    v2.hero.subtitle = 'Verzió teszt #2';
+    v2.hero.subtitle = 'Verzió teszt #2 ' + runId;
 
     for (const variant of [v1, v2]) {
       const res = await fetch(`${BASE}/save?file=contact`, {
@@ -120,7 +121,7 @@ async function main() {
     const backupHoldingV1 = fs.readdirSync(backupDir)
       .filter(name => name.startsWith('contact.'))
       .filter(name => fs.statSync(path.join(backupDir, name)).mtimeMs >= testStartedAt)
-      .find(name => fs.readFileSync(path.join(backupDir, name), 'utf8').includes('Verzió teszt #1'));
+      .find(name => fs.readFileSync(path.join(backupDir, name), 'utf8').includes('Verzió teszt #1 ' + runId));
     assert.ok(backupHoldingV1, 'seeded backup holding v1 must exist');
 
     const diffPage = await (await fetch(`${BASE}/versions?file=contact&show=${backupHoldingV1}`, { headers: { Cookie: cookie } })).text();
@@ -134,7 +135,7 @@ async function main() {
       headers: { Cookie: cookie, 'X-CSRF-Token': csrf },
     });
     assert.equal(restore.status, 200);
-    assert.ok(fs.readFileSync(contentFile, 'utf8').includes('Verzió teszt #1'));
+    assert.ok(fs.readFileSync(contentFile, 'utf8').includes('Verzió teszt #1 ' + runId));
 
     // restore created a new backup of the pre-restore state (reversibility)
     const afterPage = await (await fetch(`${BASE}/versions?file=contact`, { headers: { Cookie: cookie } })).text();