Fonts: use craft-fonts as an optional build input; move the Japanese fonts out

Shippori Mincho (and its OFL file) leaves assets/fonts/: the Japanese fonts now
live in storytold/craft-fonts. printcraft-fonts gets craft-fonts' build.rs recipe:
with CRAFT_FONTS_DIR=<checkout> it embeds the manifest's fonts as CRAFT_FONTS
(wasm32: only BIZ UDPGothic Regular); without it CRAFT_FONTS is empty and the
app builds, tests and runs as before, minus the Japanese face.

- SHIPPORI_MINCHO is now Option<&[u8]> from CRAFT_FONTS; japanese_glyph
  (was shippori_glyph) uses document_japanese_font() (Shippori Mincho, then
  BIZ UDMincho, then any Jpan face) and returns GlyphError::NoFont without one.
- Editing PDF text into Japanese without craft-fonts is a clear EditError that
  leaves the page untouched.
- UI: every Jpan craft font (BIZ UDPGothic first) is the last fallback of
  every egui family, sharing the same static bytes.
- Tests: Japanese glyph/edit tests skip without craft-fonts; new UI tests for
  no-tofu Japanese with craft-fonts and working fonts without it.
- CI: the Linux test job checks out craft-fonts at a pinned SHA and runs the
  tests with CRAFT_FONTS_DIR. Releases build every platform with it
  (CRAFT_FONTS_REQUIRED=1) and ship each font's OFL as OFL-<family>.txt.
- ATTRIBUTION.toml gains [[build_input]] (checked by xtask assets); NOTICE,
  AGENTS.md, CLAUDE.md, README and docs say fonts live in craft-fonts.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

ATTRIBUTION.md

@@ -4,7 +4,7 @@
 
 Every asset PrintCraft includes, bundles or uses to build its published material, with its author, source and licence. The policy is in [AGENTS.md](AGENTS.md) §1. The machine-readable list, with SHA-256 hashes, is [ATTRIBUTION.toml](ATTRIBUTION.toml). Licence texts are kept beside the assets and summarised in [NOTICE](NOTICE).
 
-## In this repository (244)
+## In this repository (242)
 
 | Asset | Title | Author | Licence | Source | Used for |
 |---|---|---|---|---|---|
@@ -186,8 +186,6 @@ Every asset PrintCraft includes, bundles or uses to build its published material
 | `assets/fonts/Inter-Medium.ttf` | Inter Medium | The Inter Project Authors (Rasmus Andersson) | OFL-1.1 | https://github.com/rsms/inter | UI font, embedded in the app; demo PDF labels |
 | `assets/fonts/Inter-SemiBold.ttf` | Inter SemiBold | The Inter Project Authors (Rasmus Andersson) | OFL-1.1 | https://github.com/rsms/inter | UI font, embedded in the app; demo PDF labels |
 | `assets/fonts/JetBrainsMono-Regular.ttf` | JetBrains Mono Regular | The JetBrains Mono Project Authors | OFL-1.1 | https://github.com/JetBrains/JetBrainsMono | UI monospace font; demo PDF code |
-| `assets/fonts/ShipporiMincho-Regular.ttf` | Shippori Mincho Regular | The Shippori Mincho Project Authors (FONTDASU) | OFL-1.1 | https://raw.githubusercontent.com/google/fonts/9710da1eacb3be272583c3224dcb70f9da6eadbb/ofl/shipporimincho/ShipporiMincho-Regular.ttf | Japanese fallback glyphs in edited PDF text and the edit-text UI |
-| `assets/fonts/OFL-ShipporiMincho.txt` | SIL Open Font License 1.1 for Shippori Mincho | The Shippori Mincho Project Authors (FONTDASU) | OFL-1.1 | https://raw.githubusercontent.com/google/fonts/9710da1eacb3be272583c3224dcb70f9da6eadbb/ofl/shipporimincho/OFL.txt | License for Shippori Mincho fallback font |
 | `vendor/hayro-interpret/assets/FoxitDingbats.pfb` | FoxitDingbats (standard-14 substitute font) | Foxit Software Inc. / PDFium Authors | BSD-3-Clause | https://pdfium.googlesource.com/pdfium (via hayro-interpret 0.7.0 assets/) | Renders non-embedded standard-14 fonts (vendored hayro-interpret) |
 | `vendor/hayro-interpret/assets/FoxitFixed.pfb` | FoxitFixed (standard-14 substitute font) | Foxit Software Inc. / PDFium Authors | BSD-3-Clause | https://pdfium.googlesource.com/pdfium (via hayro-interpret 0.7.0 assets/) | Renders non-embedded standard-14 fonts (vendored hayro-interpret) |
 | `vendor/hayro-interpret/assets/FoxitFixedBold.pfb` | FoxitFixedBold (standard-14 substitute font) | Foxit Software Inc. / PDFium Authors | BSD-3-Clause | https://pdfium.googlesource.com/pdfium (via hayro-interpret 0.7.0 assets/) | Renders non-embedded standard-14 fonts (vendored hayro-interpret) |
@@ -292,3 +290,11 @@ Fonts are fetched by `cargo xtask demo-pdf` into `target/demo-fonts/`, OCR model
 | `Inter-Italic[opsz,wght].ttf` | Inter Italic (variable) | The Inter Project Authors (Rasmus Andersson) | OFL-1.1 | https://github.com/google/fonts/tree/9710da1eacb3be272583c3224dcb70f9da6eadbb/ofl/inter | Showcase PDF (cargo xtask demo-pdf) |
 | `text-detection.rten` | Ocrs text detection model | Robert Knight (ocrs-models; trained on HierText, CC-BY-SA-4.0) | CC-BY-SA-4.0 | https://github.com/robertknight/ocrs-models (the models ocrs downloads; model card: https://huggingface.co/robertknight/ocrs, cc-by-sa-4.0) | Scan & OCR: finds words on page images (cargo xtask models) |
 | `text-recognition.rten` | Ocrs text recognition model | Robert Knight (ocrs-models; trained on HierText, CC-BY-SA-4.0) | CC-BY-SA-4.0 | https://github.com/robertknight/ocrs-models (the models ocrs downloads; model card: https://huggingface.co/robertknight/ocrs, cc-by-sa-4.0) | Scan & OCR: reads the words it finds (cargo xtask models) |
+
+## Optional build inputs (1)
+
+Not in this repository and never downloaded by it: compiled in only when the build sets the option (official releases do). Each input attributes its own files.
+
+| Input | Option | Title | Author | Licence | Source | Attribution | Used for |
+|---|---|---|---|---|---|---|---|
+| `craft-fonts` | `CRAFT_FONTS_DIR` | Japanese fonts: BIZ UDPGothic (Regular, Bold), Shippori Mincho, BIZ UDMincho | The BIZ UDGothic and BIZ UDMincho Project Authors (Morisawa Inc.), The Shippori Mincho Project Authors (FONTDASU) | OFL-1.1 | https://github.com/storytold/craft-fonts (pinned by commit in .github/workflows/release.yml) | https://github.com/storytold/craft-fonts/blob/main/ATTRIBUTION.md | Japanese fallback in the interface (BIZ UDPGothic first) and Japanese glyphs in edited PDF text (Shippori Mincho); the web build embeds only BIZ UDPGothic Regular |