fix: complete managed backup key remediation

Recover from structurally valid but undecryptable primary keyrings by selecting a fully cryptographically validated backup or recovery temp and reporting KEYRING_RECOVERED.

Keep committed primary writes successful when best-effort post-publication cleanup fails, preventing ambiguous retries after durable local publication.

Intercept clipboard writes inside the hidden Electron Main-process integration probe, remove the duplicate key-created toast, and make authoritative refresh coverage differ from optimistic state.

renderer/app.js

@@ -2977,7 +2977,6 @@ async function doOnlineBackupCreate() {
     if (!upsertManagedOnlineBackup(result.entry)) setManagedOnlineBackupRefreshIssue('Online-Sicherungen konnten nicht geladen werden', 'error');
     await loadManagedOnlineBackups({ mutationGeneration: authority.mutationGeneration });
     setOnlineBackupStatus('Neuer Schlüssel erstellt.', 'success', authority.statusContext);
-    showCopyToast('Online-Schlüssel erstellt');
   } catch {
     setOnlineBackupStatus('Online-Sicherung konnte nicht erstellt werden', 'error', authority.statusContext);
   } finally {

renderer/i18n.js

@@ -462,7 +462,6 @@
     ['Log-Pfad automatisch auf funktionierenden Ordner gesetzt', 'Log path automatically changed to a writable folder'],
     ['Neuer Schlüssel erstellt.', 'New key created.'],
     ['Nicht alle Einstellungen konnten gespeichert werden', 'Not all settings could be saved'],
-    ['Online-Schlüssel erstellt', 'Online key created'],
     ['Online-Schlüssel kopiert', 'Online key copied'],
     ['Online-Sicherung konnte nicht erstellt werden', 'Online backup could not be created'],
     ['Online-Sicherungen konnten nicht geladen werden', 'Online backups could not be loaded'],