feat(app): drop two sort orders, fix the proxy user name

The Compose list shows folders and entries in separate groups, so the
files first and type independent sort orders did nothing visible. They
are removed; a stored one migrates to folders first, and any unknown
value reads as folders first instead of throwing. The OpenKeychain SSH
key ID, which nothing reads any more, is removed once.

GitSettings wrote the proxy user name to the proxy preferences but read
it from the main settings, so ProxyUtils never authenticated.

Adds the pure parts of the settings port: proxy port parsing, HEAD
status and the commit log.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

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