Import existing LinTunes project

Snapshot of the existing codebase before working through the TASKS.md
backlog. Real library data (data/) and the iTunes import fixture
(itunes-test-library/) are gitignored.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

tests/test_round7.py

@@ -0,0 +1,14 @@
+from lintunes.gui import drag_ghost
+
+
+class TestDragIcon:
+    """The cursor-following drag indicator is loaded from a customizable PNG
+    that ships next to the application icon (packaging/lintunes.png)."""
+
+    def test_default_png_ships_next_to_app_icon(self):
+        assert drag_ghost.ICON_PATH.name == "drag-icon.png"
+        assert drag_ghost.ICON_PATH.exists()
+        assert (drag_ghost.ICON_PATH.parent / "lintunes.png").exists()
+
+    def test_default_file_is_a_png(self):
+        assert drag_ghost.ICON_PATH.read_bytes()[:8] == b"\x89PNG\r\n\x1a\n"