GOOD Refactor GUI components and add PlainSlider widget

- Added a new `PlainSlider` widget for keyboard-editable numeric sliders.
- Updated various panels to utilize the new `PlainSlider` for better user interaction.
- Removed unused code and dead code warnings across multiple files.
- Improved organization of modules by adding a `widgets` module.
- Cleaned up imports in several files to streamline the codebase.
- Added Qodana configuration file for code analysis and quality checks.

Cargo.toml

@@ -62,7 +62,7 @@ eframe      = { version = "0.34", default-features = false, features = ["default
 egui_extras = { version = "0.34", features = ["svg", "image"] }
 egui_dock   = { version = "0.19", features = ["serde"] }
 rfd         = "0.15"
-iced        = { version = "0.13", features = ["tokio", "image", "svg", "canvas", "wgpu", "advanced"] }
+iced        = { version = "0.13", features = ["tokio", "image", "svg", "canvas", "wgpu", "advanced", "lazy"] }
 
 # Utilities
 base64      = "0.22"