feat: Implement workflow phases for test generation and execution

- Added Phase 1: Session Start to detect input mode and create test workflow session.
- Added Phase 2: Test Context Gather to gather test context via coverage analysis or codebase scan.
- Added Phase 3: Test Concept Enhanced to analyze test requirements using Gemini and generate multi-layered test requirements.
- Added Phase 4: Test Task Generate to create test-specific tasks based on analysis results.
- Added Phase 5: Test Cycle Execute to manage iterative test execution and fix cycles with adaptive strategies.
- Introduced BottomPanel component for terminal dashboard with Queue and Inspector tabs.

ccw/frontend/src/components/shared/Flowchart.tsx

@@ -31,6 +31,7 @@ interface FlowchartNodeData extends Record<string, unknown> {
   type: 'pre-analysis' | 'implementation' | 'section';
   dependsOn?: string[];
   status?: 'pending' | 'in_progress' | 'completed' | 'blocked' | 'skipped';
+  showStepStatus?: boolean;
 }
 
 // Status icon component