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.

lib/jira-period-filter.ts

@@ -1,4 +1,4 @@
-import { JiraAnalytics, JiraTask, SprintVelocity } from './types';
+import { JiraAnalytics } from './types';
 
 export type PeriodFilter = '7d' | '30d' | '3m' | 'current';