Changelog

• Fluent Design: Implemented Fluent aesthetics with acrylic effects, rounded corners, and modern controls.
• Optimization Mode Dropdown: Improved the version selector with better text alignment and categorization (Stable vs. Experimental).
• Responsive Layout: Enhanced grid definitions to ensure the UI adapts gracefully to different window sizes.
• System Info Bar: Redesigned the top bar to clearly separate system stats (OS, CPU, RAM) from action buttons.
• Codebase Cleanup: Removed unused WPF references and streamlined the ThemeManager logic.
• Complete Framework Migration: Transitioned from WPF to Avalonia UI 11, enabling a modern, cross-platform ready interface.