feat: implement main application structure with UI and layout management

- Added main application logic in `src/ui/app.rs` to handle state and modal dialogs.
- Created module structure for UI components in `src/ui/mod.rs`.
- Implemented column configuration screen in `src/ui/screens/configuracao_colunas.rs`.
- Developed file import screen in `src/ui/screens/import.rs` for CSV and XLSX files.
- Added layout management screen in `src/ui/screens/layouts.rs` for saving and importing layouts.
- Created result display screen in `src/ui/screens/resultado.rs` to show analysis results.
- Introduced modular organization for screens in `src/ui/screens/mod.rs`.

Cargo.toml

@@ -4,3 +4,19 @@ version = "0.1.0"
 edition = "2024"
 
 [dependencies]
+eframe = "0.31"
+egui = "0.31"
+rusqlite = { version = "0.32", features = ["bundled"] }
+csv = "1.3"
+calamine = "0.26"
+rust_decimal = { version = "1.36", features = ["serde"] }
+rust_decimal_macros = "1.36"
+serde = { version = "1", features = ["derive"] }
+serde_json = "1"
+genpdf = "0.2"
+chrono = { version = "0.4", features = ["serde"] }
+encoding_rs = "0.8"
+dirs = "5"
+thiserror = "2"
+regex = "1"
+rfd = "0.15"