Insert a "Current position" row in the TOC sidebar directly under the
highlighted section, indented one level deeper, with an open-book icon
and the live reading page number. Clicking it navigates to the exact
current reading location (progress.location) — distinct from the section
header, which jumps to the section start.
Implemented via a pure buildTOCDisplayItems() helper that injects the
synthetic row after the active item, keeping the active item's index
stable so the existing TOC auto-scroll logic stays untouched. The page
number uses the same muted color as the other rows.
Also fills in the missing "File Path" i18n translations across all
locales (surfaced by i18n:extract) and records project memory notes.
Closes#4513.
Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Huang Xin
2ade769956