Fix spurious blank page in Typst when using raw set page rule

[gordonwoodhull]

Unfortunately it means changing the indentation on most of the template yet again, but we have git diff -w

Summary

• Skip the empty place(top, float: true, ...) title block in the Typst article() template when there is no title, authors, date, or abstract
• The unconditional empty block counted as content, so a subsequent raw #set page(...) in the document body triggered a page break in Typst, producing a spurious blank first page

Fixes #14217

Test plan

• New test tests/docs/smoke-all/typst/raw-set-page-no-extra-page.qmd asserts body content is on page 1
• Verified test fails without the fix (body on page 2), passes with the fix (body on page 1)
• Existing Typst tests pass (columns, callouts, title blocks)

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[gordonwoodhull]

The individual if title != none, if authors != none, etc. guards inside the title block were always there and still are.

What changed is that the Pandoc merge (d100a046c) wrapped them all in an unconditional block(), and subsequent commits added place() around it.

That outer wrapper emits content even when all the inner guards are false, which is what triggers the page break.

Our fix just adds the missing guard on that outer wrapper.

[cderv]

Fixed upstream in pandoc already: jgm/pandoc@dc4bcd2