* fix(sub): use a fullwidth percent in USAGE_PERCENTAGE
A remark is placed in the share link fragment, so an ASCII percent is
percent-encoded to %25. Happ treats such a fragment as malformed, discards the
whole remark and falls back to showing the server hostname, which defeats the
point of a remark template and leaks the host into the client's server list.
Emit U+FF05 FULLWIDTH PERCENT SIGN instead. It renders the same to a reader,
never produces %25, and round-trips through url.Parse unchanged.
* test(sub): exercise production fragment encoding
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Co-authored-by: n0ctal <293235942+n0ctal@users.noreply.github.com>
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