[Due for payment 2025-10-15] Replace deprecated Electron protocol registration API usage

[blazejkustra]

Problem: Our desktop app relies on a deprecated Electron API for custom protocol handling. In Electron v25+, protocol.registerBufferProtocol is deprecated in favor of a new API.

Solution: Migrate from protocol.registerBufferProtocol to the new protocol.handle API. This ensures our lint-changed workflow continues to work without deprecation warnings, stays compatible with Electron v25+, and avoids breakage when the old API is removed.

Issue Owner

Current Issue Owner: @muttmuure

[melvin-bot]

Triggered auto assignment to @MonilBhavsar, see https://stackoverflow.com/c/expensify/questions/7972 for more details.

[c3024]

@MonilBhavsar

Can you please assign me and a BZ member here as I reviewed the PR?