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Task ID: 1
Agent: Main Agent
Task: Redesign and improve the relationship system for Nazexa(DrawSQL-like UX)

Work Log:
- Explored full codebase: types.ts, useProjectStore.ts, useUIStore.ts, TableNode.tsx, RelationshipEdge.tsx, SchemaCanvas.tsx, PropertiesPanel.tsx, DesignerSidebar.tsx, DesignerView.tsx, CreateRelationshipDialog.tsx
- Added `updateRelationshipDirect` to useProjectStore for optimized relationship updates (patches only the specific relationship without full project rebuild)
- Rewrote TableNode.tsx with improved handle visibility: handles appear on column row hover via Tailwind group-hover/col, larger 3x3 handles with cursor-crosshair, positioned at -7px offset for better visual
- Rewrote SchemaCanvas.tsx: added `detectRelationshipType()` function that auto-detects 1:1, 1:N, N:1 based on source/target column properties (unique, PK, FK); added `isValidConnection()` to prevent self-references and invalid handle connections; added duplicate relationship check; connection line uses SmoothStep type with dashed style; `ConnectionMode.Loose` allows more flexible connections; auto-selects newly created relationship
- Rewrote RelationshipEdge.tsx with DrawSQL-style visuals: added `CrowFootMarker` SVG component rendering crow's foot notation at edge endpoints (bar for "one", three-prong for "many"); smaller cardinality badges (9px font, 18px circle); hover/selected states show center label with type badge and name; delete button on selection; animated dashed line for selected state
- Updated PropertiesPanel RelationshipTab: replaced `updateRelationship` with `updateRelationshipDirect` for performance; replaced dropdown type selector with visual grid of 4 clickable type buttons showing cardinality (1:1, 1:N, N:1, M:N) with active state highlighting
- Updated DesignerSidebar relationships section: relationship list items now show source table color dot -> source name -> cardinality -> target color dot -> target name

Stage Summary:
- Build compiles successfully (Next.js 16.1.3 Turbopack)
- Dev server returns 200
- All 6 objectives addressed

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Task ID: 2
Agent: Main Agent
Task: Implement table header click -> sidebar editor and enhanced drag-and-connect relationship system

Work Log:
- Updated TableNode.tsx: Added onHeaderClick callback, header hover state with brightness change and grip icon, connection handle highlighting during drag (source ring highlight, target pulse green), double-click opens sidebar
- Updated SchemaCanvas.tsx: Added handleHeaderClick, onConnectStart/onConnectEnd for drag tracking (isConnecting, connectingFromColumn states), handleEditRelationship callback, connection hint overlay, custom ConnectionLine component, toast on relationship creation with type info, Escape key to cancel, column click opens properties panel
- Updated RelationshipEdge.tsx: Added onEdit callback to RelationshipEdgeData, Edit3 button alongside delete button when selected
- Created ConnectionLine.tsx: Custom connection line component with smooth-step path and endpoint dot indicator

Stage Summary:
- Build compiles successfully (Next.js 16.1.3 Turbopack)
- Table header click opens right sidebar with table editor
- Drag-and-connect: handles highlight during drag, target handles pulse green, connection hint overlay shown
- Clicking a relationship edge opens properties panel to relationship tab with edit button
- All relationship types (1:1, 1:N, M:N) supported with auto-detection
- Custom connection line for better visual feedback during drag