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/sync_offset_field.rs

@@ -0,0 +1,51 @@
+use eframe::egui;
+use crate::domain::value_objects::SyncOffset;
+
+/// Campo de entrada para offset de sincronização em segundos (ex: "-1.2").
+/// Converte para SyncOffset(ms) internamente ao confirmar.
+pub struct SyncOffsetField {
+    pub raw: String,
+    pub error: Option<String>,
+}
+
+impl SyncOffsetField {
+    pub fn new(initial: SyncOffset) -> Self {
+        let seconds = initial.as_ms() as f64 / 1000.0;
+        SyncOffsetField {
+            raw: format!("{:.1}", seconds),
+            error: None,
+        }
+    }
+
+    /// Renderiza o campo e retorna true se o valor mudou.
+    pub fn ui(&mut self, ui: &mut egui::Ui, label: &str) -> bool {
+        let mut changed = false;
+        ui.horizontal(|ui| {
+            ui.label(label);
+            if ui.text_edit_singleline(&mut self.raw).changed() {
+                changed = true;
+                self.error = None;
+            }
+            ui.label("s");
+        });
+
+        if let Some(ref err) = self.error {
+            ui.colored_label(egui::Color32::RED, err);
+        }
+        changed
+    }
+
+    /// Tenta converter o valor atual para SyncOffset.
+    pub fn parse(&mut self) -> Option<SyncOffset> {
+        match SyncOffset::from_seconds_str(&self.raw) {
+            Ok(offset) => {
+                self.error = None;
+                Some(offset)
+            }
+            Err(e) => {
+                self.error = Some(format!("Valor inválido: {}", e));
+                None
+            }
+        }
+    }
+}