Chore/ux improvement bug fixes

[SagiEv]

Pull Request: UX Improvements & Bug Fixes

Overview

This pull request introduces a batch of crucial UX/UI enhancements, resolves calculation bugs in the analytics system, and optimizes backend caching mechanisms for task management endpoints. These changes collectively improve both the user experience for researchers and the performance of the backend services.

Key Changes

🎨 UX & UI Improvements

• Enhanced CSV Download UX: Revamped the CSV export workflow. Implemented a non-blocking background download process in the frontend featuring a new animated global toast notification (GlobalDownloadToast). Additionally, updated the exported CSV format to be more lightweight and traceable.
• Transition Effects: Updated UI transition effects for smoother screen navigation and interactions.

🐛 Bug Fixes

• Analytics & Task Accuracy: Fixed the logic for calculating task accuracy and the distinct completed images count. Repaired the consensus threshold evaluation logic to ensure the Completed count accurately reflects only the images that have genuinely reached the required consensus.
• Import Resolution: Fixed a broken import path that was causing production build failures within the newly integrated UI components.

⚡ Performance & Caching

• Backend Caching for Tasks: Improved the backend caching strategy for task endpoints (using Caffeine cache) to significantly reduce database load during high-traffic operations.
• Cache Invalidation Workflow: Enhanced cache invalidation synchronization for the researcher TasksManagementScreen. Task state mutations (such as pausing or archiving a task) now correctly invalidate the cache tree, ensuring the UI reflects the real-time status instantly without requiring a manual page refresh.

🔒 Security & Access Control

• Role Visibility Filtering: Added contextual filtering to the user retrieval service to ensure Superadmin users are hidden from the researchers' view (e.g., in the co-manager selection lists), preserving identity confidentiality and enforcing strict role boundaries.

🧪 Testing & Reliability

• CI Stability: Updated existing backend unit tests and fixed a failing frontend E2E play-through test to reflect the updated analytics counting logic and ensure a green continuous integration build.