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Merge pull request #132 from bartoszclapinski/sprint3/phase3.10-polish-performance-#131
feat(dashboard): add polish and performance improvements
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‎.ai/sprints/sprint3/sprint-log.md‎

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# Sprint 3 - Real-time Dashboard & Analytics - Log
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**Start Date**: November 23, 2025
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**End Date**: TBD
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**Status**: 🚀 In Progress (~80% Complete)
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**End Date**: December 4, 2025
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**Status**: ✅ COMPLETED (100%)
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### Day 5 - December 4, 2025
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**Phases completed**:
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- [x] Phase 3.9: Time Range Filters ✅
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- [x] Phase 3.10: Polish & Performance ✅
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**What I implemented (Phase 3.9)**:
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- Created `DashboardStateService` for global time range state management
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- Created `TimeRangeSelector.razor` component with preset buttons (7D/30D/90D/1Y/All)
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- Added custom date range picker option
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- Updated `Home.razor` to subscribe to state changes
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- All charts now respond to global time range filter
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- Removed individual chart time selectors for cleaner UX
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- Leaderboard title shows dynamic date range
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**What I implemented (Phase 3.10)**:
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- Created `SkeletonChart.razor` component with shimmer animation
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- Created `SkeletonChartType` enum (Line, Bar, Heatmap, Generic)
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- Created `ErrorState.razor` component with retry functionality
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- Created `EmptyState.razor` component for no-data states
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- Updated `design-system.css` with responsive dashboard styles
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- Added touch-friendly controls for mobile
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- Added accessibility improvements (focus indicators, reduced motion support)
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- Added high contrast mode support
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- Added print styles
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- Updated `charts.js` with:
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- Debounced resize handling
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- Lazy loading with IntersectionObserver
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- Performance optimizations for large datasets
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- ARIA labels for accessibility
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**What I learned**:
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- **State Management Pattern**: Using services with events for global state
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- **Skeleton Loading**: CSS shimmer animations for loading states
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- **IntersectionObserver**: Lazy loading charts when they enter viewport
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- **Debouncing**: Preventing excessive function calls on resize
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- **Accessibility**: ARIA labels, focus indicators, reduced motion, high contrast
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**GitHub**:
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- Phase 3.9:
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- Issue: #129 [SPRINT 3] Phase 3.9: Time Range Filters
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- Branch: `sprint3/phase3.9-time-range-filters-#129`
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- PR created and merged ✅
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- Phase 3.10:
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- Issue: #131 [SPRINT 3] Phase 3.10: Polish & Performance
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- Branch: `sprint3/phase3.10-polish-performance-#131`
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- PR created and merged ✅
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**Time Spent Today**: ~4 hours
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---
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## 🎓 Learning Log
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### Chart.js vs Plotly Decision
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### Phase 3.9: Time Range Filters ✅
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**Completed**: December 4, 2025
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**Time**: ~1.5 hours
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**Issue**: #129
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**Deliverables**:
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- `DashboardStateService` for global state management
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- `TimeRangeSelector.razor` component
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- Preset buttons (7D, 30D, 90D, 1Y, All)
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- Custom date range picker (MudDateRangePicker)
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- Event-based state updates
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- All charts respond to global time range
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- Dynamic leaderboard title
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---
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### Phase 3.10: Polish & Performance ✅
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**Completed**: December 4, 2025
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**Time**: ~2.5 hours
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**Issue**: #131
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**Deliverables**:
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- `SkeletonChart.razor` with shimmer animation
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- `SkeletonChartType` enum
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- `ErrorState.razor` with retry button
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- `EmptyState.razor` for no-data states
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- Responsive dashboard styles
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- Touch-friendly controls (44px min touch target)
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- Accessibility improvements (ARIA, focus, reduced motion)
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- High contrast mode support
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- Print styles
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- Chart lazy loading (IntersectionObserver)
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- Debounced resize handling
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- Performance optimizations for large datasets
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---
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## 📊 Sprint Statistics
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- **Phases Completed**: 8 / 10
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- **Phases Completed**: 10 / 10 ✅
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- **Estimated Hours**: 36-46h total
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- **Hours Spent**: ~22 hours
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- **Progress**: 80%
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- **Hours Spent**: ~26 hours
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- **Progress**: 100% COMPLETE 🎉
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## 🎯 Next Session Plan
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## 🎯 Sprint 3 Complete! 🎉
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### Phase 3.9: Time Range Filters (3-4h)
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1. **Create `TimeRangeSelector.razor` component**
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2. **Create `DashboardStateService` for state management**
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3. **Update all charts to subscribe to state changes**
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4. **Global time range filter for dashboard**
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**All 10 phases completed successfully!**
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### Phase 3.10: Polish & Performance (4-5h)
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1. **Skeleton loaders for charts**
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2. **Error states with retry button**
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3. **Performance optimization**
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4. **Mobile responsive design**
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5. **Accessibility improvements**
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### Sprint 3 Final Deliverables:
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- ✅ Chart.js integration with Blazor (JSInterop)
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- ✅ Commit Activity Line Chart
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- ✅ PR Statistics Bar Chart
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- ✅ GitHub-style Contribution Heatmap
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- ✅ Team Leaderboard (sortable, top 10)
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- ✅ SignalR real-time updates
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- ✅ Advanced metrics (PR review time, code velocity)
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- ✅ Global time range filters
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- ✅ Skeleton loading states
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- ✅ Error/Empty states
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- ✅ Performance optimizations
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- ✅ Responsive design
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- ✅ Accessibility improvements
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**Expected Outcome**: Polished, production-ready dashboard
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### Next Sprint: Sprint 4 (Planning Phase)
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Ready to plan Sprint 4 features!
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**Last Updated**: December 2, 2025
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**Current Phase**: Phase 3.9 - Time Range Filters (Next)
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**Status**: Phases 3.1-3.8 Complete! 🎉 Ready for Phase 3.9 💪
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**Last Updated**: December 4, 2025
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**Current Phase**: ALL COMPLETE! 🏆
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**Status**: Sprint 3 Successfully Completed! 🎉🚀
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‎src/DevMetricsPro.Web/Components/Pages/Home.razor‎

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@if (_isLoadingChart)
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{
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<div style="text-align: center; padding: 60px;">
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<MudProgressCircular Indeterminate="true" />
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<MudText Class="mt-2">Loading chart data...</MudText>
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</div>
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<SkeletonChart ChartType="SkeletonChartType.Line" ShowLegend="true" />
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}
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else if (_chartData != null && _chartData.TotalCommits > 0)
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{
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}
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{
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<div style="text-align: center; padding: 60px; color: var(--mud-palette-text-secondary);">
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<div style="font-size: 48px; margin-bottom: 16px;">📊</div>
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<MudText Typo="Typo.h6">No commit data available</MudText>
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<MudText Typo="Typo.body2">Connect GitHub and sync your repositories to see commit activity</MudText>
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</div>
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<EmptyState
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Emoji="📊"
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Title="No commit data available"
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Message="Connect GitHub and sync your repositories to see commit activity" />
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</MudPaper>
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@if (_isLoadingPRChart)
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{
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<div style="text-align: center; padding: 60px;">
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<MudProgressCircular Indeterminate="true" />
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<MudText Class="mt-2">Loading PR statistics...</MudText>
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</div>
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<SkeletonChart ChartType="SkeletonChartType.Bar" ShowLegend="false" />
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}
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else if (_prChartData != null && _prChartData.TotalPRs > 0)
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{
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{
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<div style="text-align: center; padding: 60px; color: var(--mud-palette-text-secondary);">
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<div style="font-size: 48px; margin-bottom: 16px;">🔀</div>
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<MudText Typo="Typo.h6">No pull request data available</MudText>
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<MudText Typo="Typo.body2">Connect GitHub and sync your repositories to see PR statistics</MudText>
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</div>
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<EmptyState
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Emoji="🔀"
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Title="No pull request data available"
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Message="Connect GitHub and sync your repositories to see PR statistics" />
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</MudPaper>
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‎src/DevMetricsPro.Web/Components/Shared/EmptyState.razor‎

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@* Empty state component for when there's no data to display *@
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<div class="empty-state @Class">
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<div class="empty-icon">
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@if (!string.IsNullOrEmpty(Emoji))
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{
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<span class="empty-emoji">@Emoji</span>
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}
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else if (Icon != null)
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{
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<MudIcon Icon="@Icon" Size="Size.Large" Color="Color.Default" />
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}
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else
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{
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<MudIcon Icon="@Icons.Material.Outlined.Inbox" Size="Size.Large" Color="Color.Default" />
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}
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</div>
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<div class="empty-content">
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<MudText Typo="Typo.h6" Class="empty-title">
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@(Title ?? "No data available")
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</MudText>
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<MudText Typo="Typo.body2" Class="empty-message">
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@(Message ?? "There's nothing to show here yet.")
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</MudText>
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</div>
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@if (ShowAction && OnAction.HasDelegate)
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{
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<MudButton
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Variant="Variant.Outlined"
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Color="Color.Primary"
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StartIcon="@ActionIcon"
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OnClick="OnAction"
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Class="mt-3">
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@(ActionText ?? "Get Started")
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</MudButton>
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}
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@if (ChildContent != null)
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{
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<div class="empty-actions mt-3">
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@ChildContent
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</div>
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}
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</div>
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@code {
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[Parameter]
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public string? Title { get; set; }
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[Parameter]
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public string? Message { get; set; }
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[Parameter]
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public string? Icon { get; set; }
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[Parameter]
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public string? Emoji { get; set; }
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[Parameter]
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public bool ShowAction { get; set; } = false;
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[Parameter]
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public string? ActionText { get; set; }
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[Parameter]
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public string? ActionIcon { get; set; } = Icons.Material.Filled.Add;
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[Parameter]
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public EventCallback OnAction { get; set; }
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[Parameter]
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public RenderFragment? ChildContent { get; set; }
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public string Class { get; set; } = string.Empty;
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}
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‎src/DevMetricsPro.Web/Components/Shared/EmptyState.razor.css‎

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.empty-state {
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display: flex;
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flex-direction: column;
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align-items: center;
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justify-content: center;
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padding: 40px 20px;
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text-align: center;
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min-height: 200px;
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}
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.empty-icon {
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margin-bottom: 16px;
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opacity: 0.6;
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}
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.empty-icon ::deep .mud-icon-root {
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font-size: 64px !important;
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color: var(--mud-palette-text-disabled);
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}
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.empty-emoji {
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font-size: 64px;
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line-height: 1;
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display: block;
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}
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.empty-content {
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max-width: 400px;
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}
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.empty-title {
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color: var(--mud-palette-text-primary);
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margin-bottom: 8px;
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font-weight: 500;
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}
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.empty-message {
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color: var(--mud-palette-text-secondary);
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line-height: 1.5;
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}
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.empty-actions {
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display: flex;
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gap: 12px;
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flex-wrap: wrap;
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justify-content: center;
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}
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/* Subtle animation */
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@keyframes float {
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0%, 100% { transform: translateY(0); }
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50% { transform: translateY(-8px); }
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}
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.empty-state:hover .empty-icon {
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animation: float 2s ease-in-out infinite;
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}
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