Apply and Upgrade Eslint (#288)

* Upgrade ESLINT and fix issues

* feat: add frontend linting job to GitHub Actions workflow

* Move UI linting to separate file

* More linting fixes

* Remove pull_request trigger from UI linting workflow

* Update UI linting workflow

* Rename frontend-lint workflow to ui-lint for clarity

ui/src/routes/devices.$id.settings.appearance.tsx

@@ -1,6 +1,8 @@
 import { useCallback, useState } from "react";
+
 import { SettingsPageHeader } from "../components/SettingsPageheader";
 import { SelectMenuBasic } from "../components/SelectMenuBasic";
+
 import { SettingsItem } from "./devices.$id.settings";
 
 export default function SettingsAppearanceRoute() {