fix: process manager shows blank window

[mcmxcdev]

Pre-flight Checklist

Please ensure you've completed all of the following.

• [x] I have read the Contributing Guidelines for this project.
• [x] I agree to follow the Code of Conduct that this project adheres to.

Description of Change

• install @syed_umair/electron-process-manager dependency
• remove @krisdages/electron-process-manager dependency
• swap out usage of openProcessManager in processManager.ts

Motivation and Context

Closes https://github.com/ferdium/ferdium-app/issues/1662

Screenshots

Before, process manager shows blank window

After, process manager works as expected again

Checklist

• [x] My pull request is properly named
• [x] The changes respect the code style of the project (pnpm prepare-code)
• [x] pnpm test passes
• [x] I tested/previewed my changes locally

Release Notes

[RJVB]

Haven't tested yet, but I'm confident it'll work.

Would a feature request to simplify access to the process manager have any chances of being accepted (I'm guessing it should take less time to implement than it took to triage the blank window issue)?

[mcmxcdev]

Would a feature request to simplify access to the process manager have any chances of being accepted (I'm guessing it should take less time to implement than it took to triage the blank window issue)?

We simply don’t have enough contributors putting their free time into this project for stuff to be fixed fast. You can make a feature request and it probably makes sense to have the process manager easily accessible than somewhere in the submenus of settings.