apilistalpha template should use HTML-formatted titles (WebKitCSSMatrix)

[caugner]

Context

The apilistalpha template uses plain page.title() which strips backtick formatting. This means titles like `WebKitCSSMatrix` render as plain text instead of being wrapped in <code> tags.

Current behavior

In crates/rari-doc/src/templ/templs/api_list_alpha.rs, the template calls page.title() which returns TitleFormat::Plain — backticks are removed, no <code> wrapping.

Available infrastructure

Since March 2026, the codebase has:

• render_title() in crates/rari-doc/src/helpers/title.rs supporting TitleFormat::Html (backtick → <code>)
• titleHTML field in JSON output for pages
• title_raw on Doc struct preserving original backtick formatting

Proposed fix

Update the apilistalpha template to use HTML-formatted titles so that backtick-wrapped names like `WebKitCSSMatrix` render with proper <code> styling.