Enhance HVideoTool's detection and restoration capabilities: introduced per-model overlay threshold settings and cross-model non-maximum suppression (NMS) to improve detection accuracy. Updated configuration management to support these features, and refined the UI for better user experience. Documentation in CLAUDE.md has been updated to reflect these changes.

hvideotool/core/project.py

@@ -19,6 +19,7 @@ threshold, restore engine). Global ``settings.json`` only seeds the defaults for
 from __future__ import annotations
 
 import json
+import os
 from dataclasses import dataclass, field
 from datetime import datetime
 from pathlib import Path
@@ -38,6 +39,9 @@ _SETTING_KEYS = (
     "detector",
     "detector_models",
     "default_threshold",
+    "model_thresholds",
+    "cross_model_nms",
+    "nms_iou",
     "restorer",
     "dm_dir",
     "dm_model",
@@ -139,9 +143,19 @@ class Project:
             "settings": self.settings,
         }
         self.root.mkdir(parents=True, exist_ok=True)
-        self.project_file.write_text(
-            json.dumps(payload, ensure_ascii=False, indent=2), encoding="utf-8"
-        )
+        # Crash-safe write (sibling .tmp + atomic os.replace): never truncate a good
+        # project.json if the app/PC dies mid-save.
+        text = json.dumps(payload, ensure_ascii=False, indent=2)
+        tmp = self.project_file.with_name(PROJECT_FILE + ".tmp")
+        try:
+            tmp.write_text(text, encoding="utf-8")
+            os.replace(tmp, self.project_file)
+        finally:
+            if tmp.exists():
+                try:
+                    tmp.unlink()
+                except OSError:
+                    pass
 
     # ----------------------------------------------------- settings <-> config
     def apply_to_config(self, cfg: AppConfig) -> None: