Refactor: Seperate history items from queue

[arabcoders]

• Refactored static asset serving to use a dynamic route-based approach instead of preloading static files.
• Added internal URL validation to the conditions_test API endpoint.
• Changed history deletion to return an empty 200 OK response when no items match the filter.
• Improved queue_manager.py clear handling by tracking deleted IDs and flushing the underlying store after removal.
• Split completed history handling from the active queue to simplify state flow and lifecycle management.
• Continued the Nuxt UI frontend cleanup with broader consistency and structural improvements.
• removed Pinia-based stores and replaced them with composables.
• Added dirty-form guards to help prevent losing unsaved changes.
• Improved pagination consistency across updated views.
• Added mobile sidebar swipe support.
• Fixed an infinite loop in the new multi-URL download flow.
• Updated and cleaned up tests to reflect the refactor.