feat(files): sync Source panel browser with chosen save directory

tests/test_file_browser.py

@@ -28,3 +28,16 @@ def test_recorded_live_file_flagged_as_recording(qapp, tmp_path):
     files_by_name = {Path(row["fileName"]).name: row for row in browser.files}
     assert files_by_name["live_P00001_20260706_143022.csv"]["isRecording"] is True
     assert files_by_name["P00002-20260706_143500.csv"]["isRecording"] is False
+
+
+def test_set_current_directory_updates_dir_and_refreshes(qapp, tmp_path):
+    """setCurrentDirectory (no native dialog) is how the Status tab's save-dir
+    picker keeps the Source panel pointed at the same folder."""
+    _write_csv(tmp_path / "P00003-20260706_143500.csv")
+
+    browser = FileBrowser()
+    browser.setCurrentDirectory(str(tmp_path))
+
+    assert browser.currentDirectory == str(tmp_path)
+    assert len(browser.files) == 1
+    assert Path(browser.files[0]["fileName"]).name == "P00003-20260706_143500.csv"