epic: Improve App Installation / Update Reliability (Tauri Migration & Patch Failures)

[louis-menlo]

Issue: Improve App Update Reliability (Tauri Migration & Patch Failures)

Problem:
There are many issues with the current app update mechanism.

1. Failed Restarts: Updates complete but app hangs or crashes on restart.
2. Version Stagnation: App restarts but runs the old version (changes not applied).
3. Partial Updates: Corrupted downloads or incomplete file replacements.

Also when moving from Electron to Tauri, there could be a break.

Additionally

• Would it be great to allow user to set app path when installting?

Let me choose the install location instead. Or make the app reasonably small and let me choose where to download the models to.

[vansangpfiev]

When testing auto updater on Windows, we encountered some issues:

• As https://tauri.app/plugin/updater/ the default installMode is passive but we still see a basic user interface shown
• The Tauri default installation path is $LOCALAPPDATA\${PRODUCTNAME}. Therefore, we need to use a custom .nsi template since the current default path is $LOCALAPPDATA\Programs\${PRODUCTNAME}

Update:

The first issue can be resolved by using a custom template to enable passive mode