- Replace direct DOM remove() with Range+execCommand('delete') in TemplateManage click and keydown handlers to restore undo stack
- Append ​ zero-width space to smart-field-wrapper HTML in insertSmartField and defaultContent.ts to prevent unwanted line breaks
- Refactor ReportEditor surgeonSignature rendering to depend on isSigned field
- Add isSigned to DEFAULT_FORM_FIELDS (single_select: 已签字/未签字)
- Change surgeonSignature to visibleInForm=true, isSystemLocked=false
- Constrain signature image with max-width:120px, max-height:40px, object-fit:contain in CSS and print.ts
- Add weak-blocking signature validation prompts in saveReport('completed')
- Update experience record (#19)
