Major release with modernized GTK4 UI and improved stability

New Features:

• Splash screen during GStreamer initialization
• Recent files menu
• Context menus on elements list and graph links
• Caps compatibility check when connecting elements
• Graph zoom support

User Interface:

• New application logo with dark theme support
• Modernized dialogs (preferences, properties, alerts)
• GTK4 widget migration (ColumnView, DropDown, FileDialog)
• Resizable columns in element browser and loggers
• Element search with plugin name and rank display
• Compact player controls layout
• Port name tooltips

Build and Platforms:

• GStreamer 1.26 and GTK 4.16
• Rust 1.85
• macOS/Windows: libav enabled, optimized installers
• CI: AppImage and deb package jobs

Stability:

• Error dialogs on pipeline failures
• Improved error handling throughout codebase
• Unit test infrastructure