[client/ui] Replace fyne UI with Wails (rename ui-wails to ui)

Removes the legacy fyne-based client/ui implementation and renames the
Wails replacement (client/ui-wails) to take its place at client/ui. Go
imports, frontend bindings, CI workflows, goreleaser configs and the
windows .syso icon path are updated to follow the rename.

client/ui/frontend/tailwind.config.ts

@@ -0,0 +1,44 @@
+import type { Config } from "tailwindcss";
+
+const config: Config = {
+  content: ["./index.html", "./src/**/*.{ts,tsx}"],
+  darkMode: "class",
+  theme: {
+    extend: {
+      colors: {
+        netbird: {
+          DEFAULT: "#f68330",
+          50: "#fff6ed",
+          100: "#feecd6",
+          200: "#ffd4a6",
+          300: "#fab677",
+          400: "#f68330",
+          500: "#f46d1b",
+          600: "#e55311",
+          700: "#be3e10",
+          800: "#973215",
+          900: "#7a2b14",
+        },
+        "nb-gray": {
+          DEFAULT: "#181A1D",
+          50: "#f4f6f7",
+          100: "#e4e7e9",
+          200: "#cbd2d6",
+          300: "#a3adb5",
+          400: "#7c8994",
+          500: "#616e79",
+          600: "#535d67",
+          700: "#474e57",
+          800: "#3f444b",
+          900: "#2e3238",
+          925: "#1e2123",
+          940: "#1c1e21",
+          950: "#181a1d",
+        },
+      },
+    },
+  },
+  plugins: [require("tailwindcss-animate")],
+};
+
+export default config;