v0.12.2 — settings page fix

Fixes the settings page. Since v0.12.0, a JavaScript escape (\n) inside the page template was being consumed before it reached the browser, leaving an unterminated string that broke the entire settings script — so the 2FA setup controls (and every other settings action) silently failed to render.

Now fixed, with an automated guard that syntax-checks every rendered page's JavaScript so this class of bug can't ship again.

If you're running Magpie, hard-refresh the settings page (Ctrl+Shift+R) to pick it up.