feat: implement project management and media track handling

- Added domain entities for audio, subtitle, and video tracks.
- Created a Project entity to manage media editing sessions.
- Implemented value objects for file paths, sync offsets, track IDs, and languages.
- Developed infrastructure for asynchronous FFmpeg process execution.
- Built a user interface for selecting video files, adding audio and subtitle tracks, and managing output settings.
- Integrated error handling and logging for media processing tasks.

src/ui/components/video_selector.rs

@@ -0,0 +1,42 @@
+use eframe::egui;
+use crate::adapters::filesystem::FilePickerAdapter;
+use crate::domain::value_objects::FilePath;
+
+/// Componente para seleção do arquivo de vídeo base.
+/// Ao confirmar, dispara LoadMediaInfo via callback.
+pub struct VideoSelector {
+    pub selected_path: Option<FilePath>,
+}
+
+impl VideoSelector {
+    pub fn new() -> Self {
+        VideoSelector { selected_path: None }
+    }
+
+    /// Renderiza o seletor. Retorna `Some(FilePath)` se um novo arquivo foi selecionado.
+    pub fn ui(&mut self, ui: &mut egui::Ui) -> Option<FilePath> {
+        let mut selected = None;
+
+        ui.group(|ui| {
+            ui.heading("Arquivo de vídeo");
+            ui.horizontal(|ui| {
+                let label = self
+                    .selected_path
+                    .as_ref()
+                    .map(|p| p.to_string_lossy().to_string())
+                    .unwrap_or_else(|| "Nenhum arquivo selecionado".to_string());
+
+                ui.label(&label);
+
+                if ui.button("Selecionar…").clicked() {
+                    if let Some(path) = FilePickerAdapter::pick_video() {
+                        self.selected_path = Some(path.clone());
+                        selected = Some(path);
+                    }
+                }
+            });
+        });
+
+        selected
+    }
+}