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/JiraSync.tsx

@@ -149,7 +149,7 @@ export function JiraSync({ onSyncComplete, className = "" }: JiraSyncProps) {
       <CardHeader className="pb-3">
         <div className="flex items-center justify-between">
           <div className="flex items-center gap-3">
-            <div className="w-2 h-2 rounded-full bg-blue-400 animate-pulse"></div>
+            <div className="w-2 h-2 rounded-full bg-blue-500 dark:bg-blue-400 animate-pulse"></div>
             <h3 className="font-mono text-sm font-bold text-blue-400 uppercase tracking-wider">
               JIRA SYNC
             </h3>