feat(frontend): Create Sprint 4 Stories and Tasks for Story Management

Created comprehensive Story and Task files for Sprint 4 frontend implementation:

Story 1: Story Detail Page Foundation (P0 Critical - 3 days)
- 6 tasks: route creation, header, sidebar, data loading, Edit/Delete, responsive design
- Fixes critical 404 error when clicking Story cards
- Two-column layout consistent with Epic detail page

Story 2: Task Management in Story Detail (P0 Critical - 2 days)
- 6 tasks: API verification, hooks, TaskList, TaskCard, TaskForm, integration
- Complete Task CRUD with checkbox status toggle
- Filters, sorting, and optimistic UI updates

Story 3: Enhanced Story Form (P1 High - 2 days)
- 6 tasks: acceptance criteria, assignee selector, tags, story points, integration
- Aligns with UX design specification
- Backward compatible with existing Stories

Story 4: Quick Add Story Workflow (P1 High - 2 days)
- 5 tasks: inline form, keyboard shortcuts, batch creation, navigation
- Rapid Story creation with minimal fields
- Keyboard shortcut (Cmd/Ctrl + N)

Story 5: Story Card Component (P2 Medium - 1 day)
- 4 tasks: component variants, visual states, Task count, optimization
- Reusable component with list/kanban/compact variants
- React.memo optimization

Story 6: Kanban Story Creation Enhancement (P2 Optional - 2 days)
- 4 tasks: Epic card enhancement, inline form, animation, real-time updates
- Contextual Story creation from Kanban
- Stretch goal - implement only if ahead of schedule

Total: 6 Stories, 31 Tasks, 12 days estimated
Priority breakdown: P0 (2), P1 (2), P2 (2 optional)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

docs/plans/sprint_4_story_2_task_6.md

@@ -0,0 +1,30 @@
+---
+task_id: sprint_4_story_2_task_6
+story_id: sprint_4_story_2
+sprint_id: sprint_4
+status: not_started
+type: frontend
+assignee: Frontend Developer 2
+created_date: 2025-11-05
+estimated_hours: 2
+---
+
+# Task 6: Integrate Task Management into Story Detail Page
+
+## Description
+
+Integrate the complete Task management system into the Story detail page and test full functionality.
+
+## Acceptance Criteria
+
+- [ ] TaskList component integrated into Story detail page
+- [ ] Task count badge shows in Story header
+- [ ] Full Task CRUD operations working
+- [ ] Filters and sorting functional
+- [ ] Checkbox status toggle working
+- [ ] E2E tests passing
+- [ ] No console errors
+
+## Estimated Time
+
+2 hours