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/.eslintrc.json

@@ -1,6 +1,9 @@
 {
   "extends": "next/core-web-vitals",
   "rules": {
-    "@typescript-eslint/no-explicit-any": "off"
+    "@typescript-eslint/no-explicit-any": "off",
+    "react-hooks/exhaustive-deps": "warn",
+    "@next/next/no-img-element": "off",
+    "react/no-unescaped-entities": "off"
   }
 }