Render view error output as HTML instead of wikitext

[malberts]

Follows-up to #1069.

The {{#view}} error box was returned as a bare parser-function string, which MediaWiki treats as wikitext. When an error message interpolates the offending user-supplied argument and that argument holds a URL, the parser autolinks it: the URL is wrapped in an anchor, and a trailing quote is swallowed into the link and percent-encoded, corrupting the surrounding markup.

Wrap the error output in the same isHTML/noparse array the success placeholder and cypher_raw already use, so the parser leaves it alone. The wrapping happens at the handle() boundary rather than inside renderError(): the internal parseArgs()/classifyArgs() plumbing distinguishes an error string from a parsed argument tuple by type, so an armoured array there would be indistinguishable from the tuple.

_{AI-authored — Claude Code, Fable 5 (max); one-line ask from @malberts after the bug surfaced in an AI review of #1069; no revisions; diff not yet human-reviewed; parser-level regression test seen failing before the fix and passing after, full PHPUnit suite + PHPCS + PHPStan green locally, and both error and success paths verified in a browser on a live dev wiki.}

Production notes

Spec and review by Fable 5 (max); implementation and tests by an Opus 4.8 (max) subagent. Browser verification was automated (Playwright) against the bundled demo data, not human-clicked.