Switch app font to JetBrains Mono

package-lock.json

@@ -8,6 +8,7 @@
       "name": "proxywarden",
       "version": "0.1.0",
       "dependencies": {
+        "@fontsource-variable/jetbrains-mono": "^5.2.8",
         "@tauri-apps/api": "^2.0.0",
         "@tauri-apps/plugin-dialog": "^2.7.1",
         "lucide-react": "^1.23.0",
@@ -747,6 +748,15 @@
         "node": ">=18"
       }
     },
+    "node_modules/@fontsource-variable/jetbrains-mono": {
+      "version": "5.2.8",
+      "resolved": "https://registry.npmjs.org/@fontsource-variable/jetbrains-mono/-/jetbrains-mono-5.2.8.tgz",
+      "integrity": "sha512-WBA9elru6Jdp5df2mES55wuOO0WIrn3kpXnI4+W2ek5u3ZgLS9XS4gmIlcQhiZOWEKl95meYdvK7xI+ETLCq/Q==",
+      "license": "OFL-1.1",
+      "funding": {
+        "url": "https://github.com/sponsors/ayuhito"
+      }
+    },
     "node_modules/@jridgewell/gen-mapping": {
       "version": "0.3.13",
       "resolved": "https://registry.npmjs.org/@jridgewell/gen-mapping/-/gen-mapping-0.3.13.tgz",