Fix: Linux AppImage update handling for in-app updating.

[NeuralFault]

Fixing support for seamless self-updating of the application when running as a Linux AppImage. The new logic handles replacing the running AppImage with the updated version, including a fallback and user notification if the automatic update fails. Currently, due to nature of AppImage security and isolation characteristics, Stability Matrix's in-app updater is not able to successfully copy over the new version over the currently existing AppImage. Causing SM to restart as the old version again and not the updated version. This required the user to manually copy the new version out of the '.StabilityMatrixUpdate' hidden directory and overwrite the old one with it.

Linux AppImage self-update support:

• Added logic in UpdateViewModel.cs to detect when running as an AppImage and, after downloading an update, generate and execute a shell script that waits for the app to exit, replaces the old AppImage with the new one, sets executable permissions, and relaunches the updated AppImage in the background.
• If the script execution fails, logs the error and presents a markdown dialog to the user explaining the manual update steps required, then falls back to the standard update process.

[gemini-code-assist]

Summary of Changes

Hello @NeuralFault, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request resolves the long-standing issue of in-app self-updating for Linux AppImages. Previously, the application could not successfully replace itself due to AppImage's isolation. The new logic introduces a sophisticated shell script-based approach to manage the replacement and relaunch of the AppImage, ensuring a smooth and automated update experience for users, with a clear fallback mechanism in case of failure.

Highlights

• Automated AppImage Updates: Implemented a new mechanism for Linux AppImages to self-update seamlessly by replacing the running application with the updated version, addressing previous limitations due to AppImage security characteristics.
• Shell Script Execution: Introduced a dynamically generated shell script (update_script.sh) that waits for the current application process to exit, moves the newly downloaded AppImage over the old one, sets executable permissions, and then relaunches the updated application in the background.
• Fallback and User Notification: Added robust error handling for cases where the update script execution fails. If the script cannot run, an error is logged, and a markdown dialog is presented to the user, explaining the manual update steps required, before falling back to the standard update process.

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[gemini-code-assist]

Code Review

This pull request introduces a mechanism for handling in-app updates for the Linux AppImage version of the application. The approach of using a shell script to replace the running AppImage is sound. However, I've identified a critical security vulnerability related to command injection in the script generation, which must be addressed. I've also provided suggestions to improve the script's robustness, maintainability of the code, and the clarity of error messages for a better user experience. Please review the detailed comments.

[NeuralFault]

ready for merge