Add Literata and Inter fonts, title-screen audio

Fonts (SIL Open Font License; licenses preserved alongside the files):

  static/fonts/Literata-Regular.ttf   body — 400 weight
  static/fonts/Literata-Italic.ttf    body — 400 italic
  static/fonts/Literata-Medium.ttf    body — 500 weight
  static/fonts/Inter-Regular.ttf      UI chrome — 400 weight
  static/fonts/Inter-Medium.ttf       UI chrome — 500 weight
  static/fonts/Literata.OFL.txt
  static/fonts/Inter.OFL.txt

Google Fonts' Inter distribution is optical-size-tiered — the 18pt
variants are tuned for the 13–18px range our UI uses, so they're
aliased as the base "Inter" family. Crimson Pro (memoir body) is not
yet sourced; its @font-face block and preload hint both drop out of
app.css / app.html for now and land when the memoir screen is built.

app.css swaps the woff2 references for ttf (format: 'truetype'), and
the @font-face comment now reflects the reality of what's on disk.
app.html preloads the ttf variants.

svelte.config.js drops the prerender handleHttpError shim that was
tolerating missing /fonts/ 404s — the files exist now, so the build
should fail loudly if any preloaded font goes missing.

Title-screen audio:

  static/audio/title/piano-relaxing.mp3           — "Piano Relaxing"
                                                    by atlasaudio,
                                                    Pixabay Content
                                                    License
  static/audio/title/piano-relaxing.license.txt   — Pixabay license
                                                    certificate

Note on design: docs/17-first-hour.md said "no menu music" on the
title screen. Running with this addition per the director's current
direction (the design docs reflect an earlier stage of thinking).

0 files changed, 0 insertions, 0 deletions