Stop flagging a blank seo_title when the article title covers it

[ssavutu]

Problem

The SEO audit warned "Missing SEO title" whenever the seo_title column was empty. But blank is the normal, working state: the public site renders the article title in its place (Scalene ArticleLayout.astro:63), and the editor previews the same fallback — its input placeholder even says "Defaults to the article title." Nothing ever persists that default, so the column stays empty and the page still ships a correct <title>.

The result was a warning firing on articles whose output was already fine — essentially the whole legacy WordPress import. At ~1,900 total issues it buried the error-level findings (missing meta description, missing featured image) that do reflect broken output.

Change

Resolve the effective title the way the renderer does, then audit that:

• Blank seo_title + a usable article title → no longer reported.
• The 60-character check now runs against the effective title, so an over-long headline on an article with no explicit SEO title is caught. This is new behavior — a few long-headline articles that were previously silent will start showing this warning. Intended: that truncation is real in SERPs.
• "Missing SEO title" survives only when there is neither, which is a genuinely broken <title>.

Testing

TestAuditArticleFallsBackToTitleForSEOTitle covers all three branches. Package tests and go vet pass.

Notes

The 49-error count on the dashboard won't move — this only touched a warning. What drops is the 1,932 total. I haven't measured the new number against prod; happy to run that count if it's worth knowing before merge.

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