iarticle - i18n-aware article/report templates

This package provides two templates, mirroring the LaTeX article vs.
report distinction:

• iarticle - flat, starts at "section", no chapters, no forced
  page breaks, no auto table of contents by default. For papers and
  other short documents.
• ireport - "chapter" is the top level (each one starts a new
  page), sections nest under it, table of contents included by
  default. For longer, structured documents.

Both localize their own generated text (chapter/section/appendix
labels, figure/table captions, "Contents", "References", "Abstract")
based on lang - see l10n/. Supported locales:

lang	locale	l10n file
en	en	l10n/en.typ
ja	ja	l10n/ja.typ

region is also accepted and forwarded to Typst's own text state
(it affects Typst's built-in, language-level behavior independent of
this package's string tables); it doesn't currently pick between
locales, since neither en nor ja is script-ambiguous the way e.g.
Chinese would be. A future locale that needs region to disambiguate
(Simplified vs. Traditional Chinese, say) can add that without
changing this API - see _locale-for in lib.typ.

To use:

#import "@preview/iarticle:0.1.1": ireport

#show: ireport.with(
    lang: "ja",
    title: "座席予約システム基本設計書"
)

= はじめに
本システムは座席予約機能を提供します。
予約管理システムと顧客管理システムのデータベースを参照します。

= アーキテクチャ
アーキテクチャについて説明します。

For a shorter, section-only document, use iarticle instead:

#import "@preview/iarticle:0.1.1": iarticle

#show: iarticle.with(
    lang: "en",
    title: "A Short Paper",
    abstract: [This paper is about...],
)

= Introduction
...

See samples/ for fuller examples, including figures,
tables, citations, and appendix(..) - report-{en,ja}.typ for
ireport, article-{en,ja}.typ for iarticle. (samples/ is
excluded from the published package bundle - see exclude in
typst.toml - to keep it small, so it won't be present in a local
@preview install; it's still browsable here and in the repository.)

Fonts

iarticle/ireport take serif-font/sans-font parameters (font
fallback lists, resolved per character, so mixed Latin/CJK text keeps
working). Left as auto (the default), the stack used depends on the
resolved locale (the same lang resolution as the string table above):
a Latin-only base for en, plus a Japanese CJK addition for ja. This
is also why an English document doesn't warn about missing CJK fonts,
but a Japanese one does if none are found. Override
serif-font/sans-font at the call site rather than editing this
template; to extend the shipped defaults instead of replacing them
outright:

#import "@preview/iarticle:0.1.1": iarticle
#import "@preview/iarticle:0.1.1": default-latin-serif-font, default-cjk-serif-font

#show: iarticle.with(
  lang: "ja",
  serif-font: default-latin-serif-font
    + ("Hiragino Mincho ProN",)
    + default-cjk-serif-font.at("ja"),
)

Local development

Run install_for_test.sh once to register this checkout as
@preview/iarticle:0.1.1, then compile anything under samples/.

Scaffold a new project from template/ the same way an end user would:

typst init @preview/iarticle:0.1.1 my-project