feat: update Jira components with improved color schemes and UI enhancements

- Refined color schemes in `BurndownChart`, `CollaborationMatrix`, `ThroughputChart`, and `TeamActivityHeatmap` for better visibility and consistency.
- Adjusted opacity handling in `TeamActivityHeatmap` for improved visual clarity.
- Cleaned up imports in `CollaborationMatrix` and `SprintComparison` for better code organization.
- Enhanced `JiraSync` component with updated color for the sync status indicator.
- Updated `jira-period-filter` to remove unused imports, streamlining the codebase.

components/jira/ThroughputChart.tsx

@@ -138,16 +138,16 @@ export function ThroughputChart({ sprintHistory, className }: ThroughputChartPro
       {/* Légende visuelle */}
       <div className="mb-4 flex justify-center gap-6 text-sm">
         <div className="flex items-center gap-2">
-          <div className="w-4 h-3 bg-blue-500 rounded-sm"></div>
-          <span className="text-blue-500">Points complétés</span>
+          <div className="w-4 h-3 bg-blue-600 dark:bg-blue-500 rounded-sm"></div>
+          <span className="text-blue-600 dark:text-blue-500">Points complétés</span>
         </div>
         <div className="flex items-center gap-2">
-          <div className="w-4 h-0.5 bg-green-500"></div>
-          <span className="text-green-500">Throughput</span>
+          <div className="w-4 h-0.5 bg-green-600 dark:bg-green-500"></div>
+          <span className="text-green-600 dark:text-green-500">Throughput</span>
         </div>
         <div className="flex items-center gap-2">
-          <div className="w-4 h-0.5 bg-orange-500 border-dashed border-t-2 border-orange-500"></div>
-          <span className="text-orange-500">Tendance</span>
+          <div className="w-4 h-0.5 bg-orange-600 dark:bg-orange-500 border-dashed border-t-2 border-orange-600 dark:border-orange-500"></div>
+          <span className="text-orange-600 dark:text-orange-500">Tendance</span>
         </div>
       </div>