feat(builder,editorial,log,encyclopedia): notebook builder UI + Letter byline + Notes toggle

[ditvor]

Summary

Ports the Trailpath design handoff's "Notebook" register to the web builder, polishes the editorial output toward the handoff's Letter design, and brings the log + encyclopedia styles into the same opt-in audit UI the editorial template uses for per-sentence provenance.

• Builder UI (/) — new "Notebook" aesthetic: dot-grid background, fountain-pen blue accent, Onest variable display + body (Cyrillic-friendly substitute for Bricolage Grotesque + Hanken Grotesk), Caveat handwriting accent on the hero doodle and signature, notebook-ruled textarea, rotated draft badge, pulse-green saved dot. Distinct from every output style by design (it's a workshop, not a publication).
• Editorial output — byline + dateline added under the dek ("Written from notes, photographs, and a recorded path. · LOCATION · DATE", tri-lingual). Everything else on the editorial template — the Notes toggle, body.audit per-source colour cues, custom ::after data-tip tooltip, photo aspect-ratio lock, photo interleaving — lands cleanly from fix(narrative,editorial): hide provenance UI, interleave photos, soften writer voice #56 and is left intact.
• Log + encyclopedia outputs — both styles now walk narrative.paragraphs and emit one <span class="sent" data-prov data-tip> per sentence (was: flat paragraph text). Default render is clean prose. A Notes button in an article-tools row flips body.audit to reveal a register-appropriate audit treatment (log: GitHub-ish blue/green/warm underlines on a highlighter background; encyclopedia: sepia underlines on a sepia ground). Vocabulary mirrors editorial — body.audit, #notesBtn, "Notes" label, data-tip, NOTES_KEY localStorage — so a creator's preference travels across all three styles.

Out of scope (next PR)

The four remaining Trailpath styles (Zine, Sunday, Postcard, Album) require a chapter-based NarrativeOutput rework and remain as "SOON" cards in the picker. A follow-up session prompt covers that work.

Test plan

• make ci — ruff check, ruff format --check, mypy, pytest with 92.07% coverage, 361 passed.
• make web-dev and load http://127.0.0.1:8765/ — verify the Notebook builder renders in EN / RU / DE with correct Cyrillic glyphs (Onest), Caveat doodle "your day / твой день / dein Tag", and the rotated draft badge.
• Generate a memory through the form (Letter style) — confirm the byline appears under the dek, photos interleave through the body (from fix(narrative,editorial): hide provenance UI, interleave photos, soften writer voice #56), and the Notes button in the top bar toggles per-source provenance treatment.
• Open the log + encyclopedia goldens (tests/golden/test-render-{log,encyclopedia}.html) — confirm the Notes button is in the article tools row, toggling it surfaces the audit UI with the custom tooltip on hover, and that localStorage persistence works (refresh → state survives).
• Print preview (Cmd+P) on all three output styles — confirm provenance treatment is suppressed and the dot-grid background drops out.

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