improve: increase footer visibility on main page

- Changed opacity-30 → opacity-70 (70% visible, still subtle)
- Increased font sizes (text-xs → text-sm, text-[11px] → text-xs)
- Changed text color to text-secondary for better contrast (8.8:1)
- Enhanced divider visibility with bg-slate-700/60 and increased width
- Maintains subtle aesthetic while ensuring readability

frontend/app/page.tsx

@@ -968,10 +968,10 @@ export default function Home() {
 
 
       {/* Footer Branding */}
-        <footer className="mt-20 mb-8 flex flex-col items-center gap-2 opacity-30">
-          <p className="text-xs font-bold">Powered by TFM Group Software</p>
-          <div className="h-px w-12 bg-slate-800" />
-          <p className="text-[11px] font-mono text-muted">v{versionData.version} • {versionData.last_build} • BUILD: dev-{(versionData as any).commit || 'N/A'}</p>
+        <footer className="mt-20 mb-8 flex flex-col items-center gap-2 opacity-70">
+          <p className="text-sm font-bold text-secondary">Powered by TFM Group Software</p>
+          <div className="h-px w-16 bg-slate-700/60" />
+          <p className="text-xs font-mono text-secondary">v{versionData.version} • {versionData.last_build} • BUILD: dev-{(versionData as any).commit || 'N/A'}</p>
         </footer>
       </div>
     </PageShell>