v0.2.1 — Theme system + two-page fix
Theme system migration
Migrates to Textual's built-in theme system so all UI chrome adapts uniformly to light / sepia / dark.
What's in
- Textual theme system — chrome adapts to the active theme; old custom palette plumbing removed. ADR-0003 records the migration.
- Fix — two-page columns now wrap to equal widths via manual stitching (previously drifted on odd-width chapters).
Numbers
3 commits, +306 / −194 lines.
Anchor commit: `e571c6f`