ARCA document type letter

[methodofaction]

This PR adds the ARCA document type by letter to the PDF invoice. Regulation says it should be clearly stated in the center top of the invoice and this is our adaptation, the convention is shown as a comparison.

[Copilot]

Pull request overview

Adds an ARCA document-type indicator (letter + code) to the invoice header for Argentinian documents by reading the ar-arca-doc-type tax extension, and updates header markup/styles plus examples to reflect the new layout.

Changes:

• Introduce ARCADocTypeLetter component (AR regime) that derives letter A/B/C from the ARCA doc-type extension and renders the header “letter box”.
• Update the generic title hero markup to always wrap the supplier logo/text in an .alias container and include the ARCA doc-type component.
• Add CSS for the ARCA doc-type box and refresh example outputs / add new AR example fixture.

Reviewed changes

Copilot reviewed 6 out of 12 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
examples/out/us-invoice.html	Updates header markup to wrap logo in .alias.
examples/out/full-invoice.html	Updates header markup to wrap logo in .alias.
examples/out/full-invoice.adjustment.html	Updates header markup to wrap logo in .alias.
examples/out/full-invoice-ar.html	Updates header markup to wrap logo in .alias.
examples/out/ar-arca-standard.html	Adds ARCA doc-type “letter box” to rendered example output.
examples/out/ar-arca-standard-logo.html	New rendered example output including logo + ARCA doc-type.
examples/ar-arca-standard-logo.json	New example input fixture containing ar-arca-doc-type extension + logo.
components/regimes/ar/arca.templ	Adds ARCADocTypeLetter templ component + helper to map doc type → A/B/C.
components/regimes/ar/arca_templ.go	Generated output for the above templ changes.
components/bill/invoice.templ	Adjusts titleHero to accept internal.Document, wraps supplier logo/text in .alias, and renders ARCA doc-type component.
components/bill/invoice_templ.go	Generated output for the above invoice templ changes.
assets/styles/invoice.css	Makes .hero flex, makes .alias flex-grow, and adds styles for .arca-doc-type.

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[methodofaction]

@pmenendz I deliberately changed the markup so if an invoice has a logo, it will still be contained within the .alias element (before it was either <div class="alias">Company name</div> or <img src="...">, now it's <div class="alias"><img src="..."></div>