All 16 managers now receive ManagerRegistry instance through constructor
instead of calling ManagerRegistry.getInstance(). This enables each
BimEngine instance to have its own isolated set of managers.
Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-opencode)
Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>
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.
