UI fixes: emoji icons, modal form, Czech labels, polish

- Fixed group emoji icons in DB (💼🛒📚🗺️🏃✨🏠🌿)
- Added TaskModal component for + button
- Czech status labels (Čeká, Probíhá, Hotovo, Zrušeno)
- Improved TaskCard, GroupSelector, Header, StatusBadge
- Better dark/light mode transitions

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

apps/tasks/app/layout.tsx

@@ -37,7 +37,7 @@ export default function RootLayout({
         <ThemeProvider>
           <AuthProvider>
             <Header />
-            <main className="max-w-4xl mx-auto px-4 py-6">
+            <main className="max-w-4xl mx-auto py-4">
               {children}
             </main>
           </AuthProvider>