Insomnia flatpak on Silverblue/Bluefin

### Expected Behavior

Insomnia works on Project Bluefin

### Actual Behavior

Insomnia does not boot on Project Bluefin

### Reproduction Steps

1. Install Project Bluefin OS
2. Install Insomnia from Flathub
3. Try to launch Insomnia

### Is there an existing issue for this?

- [X] I have searched the [issue tracker](https://www.github.com/Kong/insomnia/issues) for this problem.

### Which sync method do you use?

- [ ] Git sync.
- [ ] Insomnia Cloud sync.
- [ ] Local only

### Additional Information

I am running the immutable OS Project Bluefin (basically Fedora Silverblue).
When download Insomnia over flathub, it won't boot.

In terminal I get:
```
❯ flatpak run rest.insomnia.Insomnia
[2:1128/141931.614868:ERROR:bus.cc(407)] Failed to connect to the bus: Failed to connect to socket /run/dbus/system_bus_socket: No such file or directory
14:19:31.904 › Running version 10.0.0
LaunchProcess: failed to execvp:
xdg-settings
14:19:31.908 › [electron client protocol] FAILED to set default protocol 'insomnia://'
14:19:31.909 › [electron client protocol] the current executable is not the default protocol for 'insomnia://'
14:19:31.911 › [electron client protocol] the default application set for 'insomnia://' was not found

(insomnia:2): Gdk-WARNING **: 14:19:56.926: Settings portal not found: Error calling StartServiceByName for org.freedesktop.portal.Desktop: Timeout was reached
[2:1128/141956.953573:ERROR:bus.cc(407)] Failed to connect to the bus: Failed to connect to socket /run/dbus/system_bus_socket: No such file or directory
[2:1128/141956.953590:ERROR:bus.cc(407)] Failed to connect to the bus: Failed to connect to socket /run/dbus/system_bus_socket: No such file or directory
14:19:56.979 › [fix] Running database repairs
14:19:57.127 › [db] Initialized DB at /var/home/max/.var/app/rest.insomnia.Insomnia/config/Insomnia/insomnia.$TYPE.db
14:19:57.127 › [db] Init responses DB
14:19:57.127 › [db] Init websocket-responses DB
14:19:57.136 › [localstorage] Initialized at /var/home/max/.var/app/rest.insomnia.Insomnia/config/Insomnia/localStorage
14:19:57.149 › [main] Loading file:///app/main/resources/app.asar/index.html
14:19:57.155 › [main] Registering the hidden window restarting handler
14:19:57.156 › [updater] Not supported on this platform linux
[2:1128/141957.203786:ERROR:wayland_event_watcher.cc(43)] libwayland: [destroyed object]: error 7: failed to import supplied dmabufs: Could not bind the given EGLImage to a CoglTexture2D
```

I tried setting `-enable-features=UseOzonePlatform,WaylandWindowDecorations --ozone-platform-hint=auto` but that doesn't change anything.

Is this a bug or intended behavior?

### Insomnia Version

10.0.0

### What operating system are you using?

Other Linux

### Operating System Version

Project Bluefin

### Installation method

flathub

### Last Known Working Insomnia version

_No response_

Start by reproducing the launch failure with `flatpak run rest.insomnia.Insomnia` on Project Bluefin and compare the reported D-Bus, portal, xdg-settings, and Wayland errors. Done means identifying the cause and making the Flathub installation launch successfully on the reported environment.

Written by the indexing model from the issue text.