Add Next.js frontend PWA

- Pages: login, register, tasks list, task detail
- Components: TaskCard, TaskForm, GroupSelector, StatusBadge, Header
- Tailwind CSS, dark/light mode, PWA manifest
- Running on :3001 via systemd

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

apps/tasks/tailwind.config.ts

@@ -0,0 +1,34 @@
+import type { Config } from "tailwindcss";
+
+const config: Config = {
+  content: [
+    "./pages/**/*.{js,ts,jsx,tsx,mdx}",
+    "./components/**/*.{js,ts,jsx,tsx,mdx}",
+    "./app/**/*.{js,ts,jsx,tsx,mdx}",
+  ],
+  darkMode: "class",
+  theme: {
+    extend: {
+      colors: {
+        background: "var(--background)",
+        foreground: "var(--foreground)",
+        card: "var(--card)",
+        "card-border": "var(--card-border)",
+        muted: "var(--muted)",
+        group: {
+          prace: "#3B82F6",
+          nakup: "#10B981",
+          study: "#8B5CF6",
+          plany: "#F59E0B",
+          sport: "#F97316",
+          duchovni: "#D4A017",
+          domaci: "#92400E",
+          relax: "#06B6D4",
+        },
+      },
+    },
+  },
+  plugins: [],
+};
+
+export default config;