feat(player): add ASR/YOLO overlays, zoom, and text rendering

- Add TTF text rendering for subtitles and YOLO labels
- Implement ASR subtitle display with background
- Add YOLO bbox rendering with class labels
- Add zoom in/out (+/-) and reset (Backquote)
- Add frame/time info display
- Fix YOLO metadata parsing for actual file format
- Add Shift+Arrow for 1-second seek

src/overlay/yolo.rs

@@ -41,12 +41,23 @@ pub struct YoloMetadata {
     pub status: Option<String>,
     pub total_detections: u64,
     pub avg_detections_per_frame: f64,
+    #[serde(default)]
+    pub auto_save_interval: Option<u32>,
+    #[serde(default)]
+    pub processing_time: Option<f64>,
+    #[serde(default)]
+    pub avg_time_per_frame: Option<f64>,
+    #[serde(default)]
+    pub last_saved_at: Option<String>,
+    #[serde(default)]
+    pub completed_at: Option<String>,
+    #[serde(default)]
+    pub auto_save_count: Option<u32>,
 }
 
 #[derive(Debug, Clone, Deserialize)]
 pub struct YoloData {
     pub metadata: YoloMetadata,
-    #[serde(flatten)]
     pub frames: HashMap<String, FrameData>,
 }