Fix #1

[NicBOMB]

The included wrapper script to launch proton mail fails on wayland due to the if condition on line 70 checking for a non existent file in the $XDG_RUNTIME_DIR. Fixing that condition does minimally resolve the issue.

However, completely removing the script in favor of a single env var is far simpler. Proton Mail Beta's asar'd package.json includes '"electron": "29.0.1"'. Since Electron 28.x.x, wayland support can be enabled via the ELECTRON_OZONE_PLATFORM_HINT env var.
https://releases.electronjs.org/release/v28.0.0
https://www.electronjs.org/docs/latest/api/environment-variables#electron_ozone_platform_hint-linux

Although Element is a noteworthy electron app example, its configuration is far older and carries fixes related to old electron versions. Any past conflicts with specific users' graphics drivers are likely not relevant anymore.
flathub/im.riot.Riot#452 (comment)
Script source for Element on electron 13: flathub/im.riot.Riot@2b9214a

[flathubbot]

Started test build 142015

[flathubbot]

Build 142015 successful
To test this build, install it from the testing repository:

flatpak install --user https://dl.flathub.org/build-repo/125069/me.proton.Mail.flatpakref

[flathubbot]

Started test build 142026

[flathubbot]

Build 142026 successful
To test this build, install it from the testing repository:

flatpak install --user https://dl.flathub.org/build-repo/125079/me.proton.Mail.flatpakref

[NicBOMB]

Build 142026 successful To test this build, install it from the testing repository:

flatpak install --user https://dl.flathub.org/build-repo/125079/me.proton.Mail.flatpakref

@proletarius101 This build is running.
In my first commit I accidentally wrote /app/proton-pass/Proton Mail Beta, which is why I did a force-push to cleanup those commits.

refi64/Cobalt is probably unnecessary for any electron app ver >=28.x.x unless it needs a lot of specific feature flags. Likely none of the Proton apps need those.
See also flathub/me.proton.Pass#20 (comment)

[proletarius101]

Thanks for the contribution and elaboration! Everything looks great to me.