Add selected dashcam imports

Co-authored-by: Copilot <[email protected]>

app.py

@@ -35,8 +35,22 @@ def dash_devices():
 
 @app.route('/api/dash/import', methods=['POST'])
 def dash_import():
-    summary = app_dash.import_dashcam()
-    return jsonify(summary)
+    body = request.get_json(silent=True)
+    if body is None:
+        relative_paths = None
+    elif isinstance(body, dict):
+        relative_paths = body.get("paths", [])
+    else:
+        relative_paths = []
+    summary = app_dash.import_dashcam(relative_paths=relative_paths)
+    status_code = (
+        200
+        if summary["status"] == "ok"
+        else 400
+        if summary["status"] == "invalid_selection"
+        else 409
+    )
+    return jsonify(summary), status_code
 
 @app.route('/api/dash/files')
 def dash_files():