feat: Custom CSS now also applies to settings window

src/features/theming/theming.ts

@@ -0,0 +1,31 @@
+import fs from "fs";
+import { settings } from "../../constants/settings";
+import { settingsStore } from "../../scripts/settings";
+import { Logger } from "../logger";
+
+// eslint-disable-next-line @typescript-eslint/no-explicit-any
+export function addCustomCss(app: any, logger: typeof Logger) {
+  window.addEventListener("DOMContentLoaded", () => {
+    const selectedTheme = settingsStore.get<string, string>(settings.theme);
+    if (selectedTheme !== "none") {
+      const userThemePath = `${app.getPath("userData")}/themes/${selectedTheme}`;
+      const resourcesThemePath = `${process.resourcesPath}/${selectedTheme}`;
+      const themeFile = fs.existsSync(userThemePath) ? userThemePath : resourcesThemePath;
+      fs.readFile(themeFile, "utf-8", (err, data) => {
+        if (err) {
+          logger.alert("An error ocurred reading the theme file.", err, alert);
+          return;
+        }
+
+        const themeStyle = document.createElement("style");
+        themeStyle.innerHTML = data;
+        document.head.appendChild(themeStyle);
+      });
+    }
+
+    // read customCSS (it will override the theme)
+    const style = document.createElement("style");
+    style.innerHTML = settingsStore.get<string, string[]>(settings.customCSS).join("\n");
+    document.head.appendChild(style);
+  });
+}