Add sorting capability for "选择" and "材料名称" columns in the CheckboxTreeview:
- Click column header to cycle through: asc (↑) → desc (↓) → unsort
- Sort "选择" column by checkbox state (checked/unchecked)
- Sort "材料名称" column alphabetically
- Preserve checkbox states during sorting using move() instead of delete+insert
- Separate event handlers for cell clicks and heading clicks
Implementation details:
- Added 6 new helper methods to CheckboxTreeview class
- Store original headings to properly display sort arrows
- Use identify_region() to distinguish between cell and heading clicks
- Column index conversion (#1/#2) to column identifiers
The sorting is a pure frontend feature with no database changes.
Available to all users without permission restrictions.
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
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