Enhance dashboard and worker details UI with improved data presentation

[garnizeh]

This pull request implements and completes the "Worker Detail" page, adding several backend and frontend features to support real-time monitoring and historical analysis for individual workers. The changes span database queries, API endpoints, UI rendering helpers, and test updates to ensure robust aggregation and display of worker statistics.

Worker detail and monitoring enhancements:

• Added new SQL queries and Go methods to fetch recent worker history logs (GetWorkerHistoryLogs) and results by worker (GetResultsByWorker), enabling detailed worker activity and checkpoint display on the UI. [1] [2] [3] [4]
• Improved lifetime stats aggregation by combining archived and recent data for a unified view, updating both SQL and Go code to provide accurate totals and averages for each worker. [1] [2]
• Enhanced checkpoint and completion handlers to correctly track nonce ranges for each worker history record, improving accuracy of batch and throughput statistics. [1] [2] [3] [4]

UI and rendering improvements:

• Added new template helpers for chart height styling and formatted counts, improving readability and visual presentation of worker metrics and historical charts. [1] [2]
• Extended template helpers to handle sql.NullInt64 and sql.NullFloat64 values, ensuring robust rendering of potentially missing or optional data fields. [1] [2]

Database and API adjustments:

• Changed job listing queries to show the most recent jobs first and limit results for performance, and updated active worker details to support new throughput calculation logic. [1] [2] [3] [4]
• Updated stats broadcasting struct field names for clarity and consistency in API responses.

Testing and documentation updates:

• Updated tests to reflect new lifetime stats structure and validation logic. [1] [2]
• Marked the "Worker Detail" page task as completed and updated acceptance criteria in project documentation. [1] [2]