A3S Office v0.31.0

Highlights

• Adds native Writer document indexes with primary and secondary entries, cross-references, emphasized page numbers, navigation, 1–4 columns, indented/run-in layouts, four leader styles, explicit refresh, and one-step Undo.
• Preserves editable DOCX XE and INDEX fields across export, import, reopen, and second export, with bounded generation and fail-closed diagnostics.
• Publishes the capability in the README, bilingual latest documentation, frozen 0.31.0 documentation, and the first-viewport Playground strip.
• Hardens advanced-font selection capture so an immediate keyboard shortcut cannot format only future input under load.

Validation

• CI and GitHub Pages workflows passed on the release commit.
• 1,978 Rstest tests passed.
• 393 Playwright visual tests passed; 13 conditional tests skipped; 0 failed.
• Local A3S Test desktop, phone, documentation, and Playground scenarios passed with empty console and page-error diagnostics.