feat: persistent Library tab in ScanResultsPanel (survives per-file rebuilds)

tests/test_ui_structure.py

@@ -869,3 +869,33 @@ def test_audio_library_edit_emits(win, tmp_path):
     lib.edit_requested.connect(lambda p: got.append(p))
     lib._on_edit()
     assert got == [str(a)]
+
+
+def test_scan_panel_library_tab_persists(win):
+    import main as m
+    from PyQt6.QtWidgets import QTableWidget
+    sp = win._scan_panel
+    assert isinstance(sp._library, m.AudioLibraryTab)
+    titles = [sp._tabs.tabText(i) for i in range(sp._tabs.count())]
+    assert "Library" in titles
+    # add a fake model tab, then clear model tabs -> library survives
+    sp._tabs.addTab(QTableWidget(), "EAT_LARGE (3)")
+    sp._clear_model_tabs()
+    titles2 = [sp._tabs.tabText(i) for i in range(sp._tabs.count())]
+    assert titles2 == ["Library"]           # only the library remains
+    assert sp._library is sp._tabs.widget(0)
+
+
+def test_scan_reload_selects_model_tab_not_library(win):
+    # Reloading a scanned file must leave a MODEL tab current (index 1), not the
+    # Library at index 0 — otherwise _current_table() is None and the timeline
+    # shows no scan regions until the user manually clicks a model tab.
+    sp = win._scan_panel
+    sp._filename = "clip.mp4"
+    sp._profile = "prof"
+    results = {"EAT_LARGE": [(1, 0.0, 1.0, 0.9, False, 0.0, 1.0)]}
+    sp._on_scan_bundle_loaded("clip.mp4", "prof", set(), [], results)
+    assert sp._library is sp._tabs.widget(0)          # Library stays at index 0
+    assert sp._tabs.currentIndex() == 1               # a model tab is selected
+    assert sp._current_table() is not None            # regions resolve immediately
+    assert sp.current_model_name() == "EAT_LARGE"