Update all three section dialogs to support hide/show toggle:
SectionAxisDialogManager:
- onHideToggle now calls hideSection()/recoverSection()
SectionBoxDialogManager:
- onHideToggle now calls hideSection()/recoverSection()
SectionPlanePanel:
- Add isHidden state tracking
- Change onHide to onHideToggle(isHidden)
- Add setHiddenState/getHiddenState methods
- Update button to toggle active state
SectionPlaneDialogManager:
- Switch to onHideToggle callback
- Call hideSection()/recoverSection() based on toggle state
Behavior: Click hide button to hide section, click again to recover.
- Added core Tree component (BimTree, BimTreeNode)
- Added TreeManager for lifecycle management
- Added ModelTreeManager for business logic encapsulation (Tree + Dialog)
- Integrated into BimEngine and updated demos
- Added internationalization support
