Implement passkey upgrade .wellknown for proton accounts
This is separate from https://protonmail.uservoice.com/forums/953584-proton-pass/suggestions/48670034-automatic-passkey-upgrade as it's for proton to have this themself, rather than for proton pass to support such.
The domains should be https://account.proton.me/ and https://account.protonvpn.com/
Googles info on such: https://developers.google.com//identity/passkeys/developer-guides/upgrades/
Github: https://github.com/ms-id-standards/MSIdentityStandardsExplainers/blob/main/PasskeyEndpointsWellKnownUrl/explainer.md
and
https://w3c.github.io/webappsec-passkey-endpoints/passkey-endpoints.html
This would allow easier setup of more secure proton accounts, and in the future when proton pass supports such, easier passkey setup in such for proton accounts themself.

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GreenStar commented
Apples method should also be implemented but... apple does it weird so their method isn't as important.