[EPIC] Complete sidebar redesign with tab navigation and integrated controls

[fx]

Overview

Complete redesign of the sidebar to create a unified navigation system that combines header functionality, screen navigation, and widget controls. The sidebar should use a tab-based interface that can be pinned/unpinned and shows icons when collapsed.

Success Criteria

• Replace burger menu with tab-based sidebar that overlays dashboard
• Heart icon tab for pinning/unpinning sidebar
• Persistent sidebar state (pinned/unpinned)
• Header functionality integrated into sidebar
• Remove "Widgets" title and create clean, compact interface
• Screen tabs integrated as button elements in sidebar
• Collapsed sidebar shows screen icons for quick navigation
• Smooth animations for all transitions
• Touch-optimized interface throughout