add resume support, metadata paths, LRCLIB order and overall progress

- store source track path in metadata.json and validate it when skipping ready files
- add skip_existing/resume_partial options to config and GUI
- identify lyrics via embedded text, Shazam, then one LRCLIB author search
- keep post-ASR LRCLIB text matching and allow cancelling safely
- recover from CUDA OOM and free VRAM between batch stages
- add overall completed/total file progress bar to GUI and pipelines

gui/theme.py

@@ -184,6 +184,18 @@ QProgressBar::chunk {
     border-radius: 7px;
     margin: 1px;
 }
+QProgressBar#overallProgress {
+    min-height: 28px;
+    max-height: 28px;
+    font-weight: 600;
+    color: #cdd6f4;
+    border-color: #45475a;
+}
+QProgressBar#overallProgress::chunk {
+    background-color: #a6e3a1;
+    border-radius: 8px;
+    margin: 2px;
+}
 
 QScrollBar:vertical {
     background: #181825;