fix(lexicon): Keep signup email manager URL out of trailing punctuation

[Ibochkarev]

What changed and why

Some mail clients (Windows Mail was the original report) autolink [[+surl]] in the default signup email and pull in the following , or ). The opened URL 404s.

English setting_signupemail_message_default now uses an HTML anchor: <a href="[[+surl]]">[[+surl]]</a>. Punctuation stays outside the href. Mail already goes out as HTML via email/default.tpl.

The 3.3.0 upgrade wraps bare [[+surl]] in the stored signupemail_message setting the same way. Values that already use href="[[+surl]]" (or customized text without surl) are left alone. Other lexicon locales are unchanged in this PR.

How to test

1. Fresh/dev site: set System Settings → signupemail_message to the English default (or clear it and confirm create-user notify falls back / uses the updated default after reset).
2. Create a user with "notify" enabled. Open the message in a client that autolinks plain URLs (or inspect the HTML). The manager link must not include a trailing , or ).
3. Upgrade path: put an old stock value in the DB (…at [[+surl]],… or …([[+surl]])…), run the 3.3.0 upgrade script, confirm it becomes an <a href="[[+surl]]"> and customized messages without that placeholder are untouched.

Related issue(s)/PR(s)

Resolves #15209

Compatibility notes

Universal for sites that still use the stock signupemail_message text (common after 2.x upgrades). Fresh 3.x installs without that setting already fall back to login_signup_email, which already uses a proper link.

Breaking change assessment

No public API change. Default English copy and upgrade rewrite of matching DB values only. Custom signup email text without [[+surl]] is not modified. Safe for patch-level consumers.

Test coverage

No automated tests. Coverage is email-client behavior and a one-shot setup upgrade against stored system setting values.

Contributors

Thanks @stuke2 for the report.

AI tool use

Cursor (Composer) helped draft the lexicon/upgrade change and this PR description. I reviewed the diff and the upgrade guards before opening the PR.