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_round5.py

@@ -0,0 +1,46 @@
+from lintunes.gui.track_table import format_total_time
+from lintunes.gui.library_view import _canonical_values, _artist_sort_key
+
+
+class TestFormatTotalTime:
+    def test_minutes_seconds(self):
+        assert format_total_time((14 * 60 + 21) * 1000) == "14:21"
+
+    def test_hours(self):
+        ms = (9 * 3600 + 47 * 60 + 33) * 1000
+        assert format_total_time(ms) == "9:47:33"
+
+    def test_days_zero_pads_lower_units(self):
+        ms = (24 * 86400 + 18 * 3600 + 42 * 60 + 7) * 1000
+        assert format_total_time(ms) == "24:18:42:07"
+
+    def test_zero_keeps_min_sec(self):
+        assert format_total_time(0) == "0:00"
+
+
+class TestCanonicalValues:
+    def test_most_tracks_spelling_wins(self):
+        values = ["The Beatles", "The Beatles", "the beatles"]
+        assert _canonical_values(values) == ["The Beatles"]
+
+    def test_tie_breaks_on_more_capitals(self):
+        # equal counts -> the spelling with more uppercase letters wins
+        assert _canonical_values(["abc", "ABC"]) == ["ABC"]
+
+    def test_distinct_names_preserved(self):
+        result = sorted(_canonical_values(["Beat Happening", "The Beatles"]))
+        assert result == ["Beat Happening", "The Beatles"]
+
+
+class TestArtistSortKey:
+    def test_strips_leading_the(self):
+        assert _artist_sort_key("The Beatles") == "beatles"
+
+    def test_files_next_to_neighbor(self):
+        # "The Beatles" should sort adjacent to "Beat Happening"
+        names = ["The Beatles", "Beat Happening", "Beck"]
+        assert sorted(names, key=_artist_sort_key) == [
+            "Beat Happening", "The Beatles", "Beck"]
+
+    def test_no_article_unchanged(self):
+        assert _artist_sort_key("Beck") == "beck"