Introduced a sidebar and header component to improve layout organization and UI consistency. Added state management for navigating between pages (dashboard, scraper, schedules, logs) with placeholder content for future implementations.
Replaces inline start/stop logic with reusable functions that accept session-specific parameters. Introduces `handleSessionAction` to unify start/stop actions for individual sessions, improving code clarity and reducing redundancy. Adds buttons in the UI to control each session dynamically based on its state.
