Release v2.1.0: Entity Quick-Create & Evidence Integration

Major Features:
- Entity quick-create modal integrated into all frameworks
- Complete evidence linking system (Phase 3)
- Auto-linking of newly created entities
- Evidence panel with risk aggregation

Framework Coverage:
- Starbursting, COG, PMESII-PT, DOTMLPF, DIME, VRIO
- Stakeholder, Behavioral, Trend, Causeway, PEST, Deception

Components Added:
- EntityQuickCreate: unified creation modal
- EvidenceLinker: evidence search and selection
- EvidencePanel: evidence management sidebar
- EvidenceBadge: risk visualization

UI/UX Improvements:
- Enhanced slider visibility
- Reorganized navigation hierarchy
- Source type generalization
- Improved error handling

Breaking Changes: None
Backwards Compatible: Yes