The chunking debug panel was an inline section that crowded the
strategy form, broke its own layout with negative margins, and crashed
on result.rejected being null. The trigger button required scrolling to
the form's bottom to reach.
- Move debug into a right-side t-drawer pinned above the modal stacking
context (attach=body, z-index 3000) so it overlays cleanly.
- Promote the trigger to a sticky header sibling next to the section
title, with right padding to clear the modal close button.
- Replace unicode arrows / + / − with tdesign-icons (Chevron, Play,
ErrorCircle) and rebuild the result layout: pill-shaped breadcrumb
tags, line-clamped previews with gradient fade on collapse, ordered
chunk list, structured error block.
- Drop custom char counter (t-textarea already has one).
- Add four sample fixtures (markdown / faq / chapter / plain) loadable
as preset chips so users have realistic content to test against.
- Guard `result.rejected` nullability that crashed the panel.
- Normalize the recursive tier label to legacy in the UI since both
tiers behave identically — pairs with the backend cleanup.
- Rename strategy labels in zh-CN/en-US/ko-KR/ru-RU from internal jargon
("auto", "heading", "heuristic", "legacy") to descriptive names
("Automatic", "Heading-aware", "Structure-aware", "Length-based") and
add presetLabel + sample i18n keys.
wizardchen
49cd392308