[PM-3680] Remove ipcRenderer from desktop-theming.service (#6478)

apps/desktop/src/app/services/desktop-theming.service.ts

@@ -1,5 +1,4 @@
 import { Injectable } from "@angular/core";
-import { ipcRenderer } from "electron";
 
 import { ThemingService } from "@bitwarden/angular/services/theming/theming.service";
 import { ThemeType } from "@bitwarden/common/enums";
@@ -7,12 +6,10 @@ import { ThemeType } from "@bitwarden/common/enums";
 @Injectable()
 export class DesktopThemingService extends ThemingService {
   protected async getSystemTheme(): Promise<ThemeType> {
-    return await ipcRenderer.invoke("systemTheme");
+    return await ipc.platform.getSystemTheme();
   }
 
   protected monitorSystemThemeChanges(): void {
-    ipcRenderer.on("systemThemeUpdated", (_event, theme: ThemeType) =>
-      this.updateSystemTheme(theme)
-    );
+    ipc.platform.onSystemThemeUpdated((theme: ThemeType) => this.updateSystemTheme(theme));
   }
 }

apps/desktop/src/platform/preload.ts

@@ -1,6 +1,6 @@
 import { ipcRenderer } from "electron";
 
-import { DeviceType } from "@bitwarden/common/enums/device-type.enum";
+import { DeviceType, ThemeType } from "@bitwarden/common/enums";
 
 import { isDev, isWindowsStore } from "../utils";
 
@@ -12,6 +12,11 @@ export default {
   isDev: isDev(),
   isWindowsStore: isWindowsStore(),
   reloadProcess: () => ipcRenderer.send("reload-process"),
+
+  getSystemTheme: (): Promise<ThemeType> => ipcRenderer.invoke("systemTheme"),
+  onSystemThemeUpdated: (callback: (theme: ThemeType) => void) => {
+    ipcRenderer.on("systemThemeUpdated", (_event, theme: ThemeType) => callback(theme));
+  },
 };
 
 function deviceType(): DeviceType {