fix(app): handle opening new installation instance

[ShGKme]

☑️ Resolves

• Allows launching a new instance of Talk instead of a running one
• Prevents a situation when there is an old Talk keep running in the background instead of a new one after installation

How to test

1. Build executable with npm run build
2. Copy it to a new location. now you have 2 "installations"
3. Run the first one, open some chat/settings
4. Minimize or close the window
5. Try to run the first installation again
   • It should open/focus the window
6. Open the second installation
   • Before: the first window is open instead of the new installation
   • After: the first installation is closed and the new is launched
7. Run the second installation again
   • Just to make sure it still works as expected for a single instance

[Antreesy]

1. Build executable with npm run build
2. Copy it to a new location. now you have 2 "installations"

That's why it doesn't work with old builds 👀

[ShGKme]

Rebased onto main

[ShGKme]

That's why it doesn't work with old builds 👀

Not sure what you mean