fix: pass explicit locale to date formatting to prevent hydration mismatch

Server and client could use different default locales for
toLocaleDateString/toLocaleString, causing React hydration errors.
Pass the user locale explicitly in JobsList and SettingsPage.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

apps/backoffice/app/settings/SettingsPage.tsx

@@ -734,7 +734,7 @@ export default function SettingsPage({ initialSettings, initialCacheStats, initi
                     >
                       <div className="flex items-center justify-between">
                         <span className="text-sm font-medium text-foreground">
-                          {new Date(r.created_at).toLocaleString()}
+                          {new Date(r.created_at).toLocaleString(locale)}
                         </span>
                         <span className="text-xs text-muted-foreground truncate ml-2" title={r.komga_url}>
                           {r.komga_url}