Add an always-visible, opt-in progress bar with chapter tick marks in the
persistent footer, so reading progress no longer disappears like the hover
footer slider does.
- New StickyProgressBar: a 1px rounded-border capsule with a fill and
chapter tick marks; display-only, e-ink aware, and RTL safe. Ticks render
inside the clipped track so the rounded ends crop them and they never
exceed the border.
- Chapter ticks come from the TOC, mapped to spine-section start fractions
(getChapterTickFractions); the first and last ticks are trimmed so they
do not crowd the rounded ends.
- Thread the overall size-domain reading fraction through setProgress so the
bar fill aligns with the tick domain.
- Footer layout: when enabled the bar grows on the left and the info widgets
group to the right with even spacing; otherwise the existing layout is
unchanged.
- Horizontal writing mode only; vertical keeps the current footer.
- Add the showStickyProgressBar view setting, a LayoutPanel toggle, and i18n.
Closes#1616.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Huang Xin
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