Fix version display, deterministic sort, remove duplicate sort

get_version() now returns version.name instead of str(version), which
returned the numeric ID from redminelib.resources.Version. Falls back
to str() when .name is absent (#14).

Add issue.id as tertiary sort key in build_grouped_report so tasks
within the same project+version group always appear in the same order
regardless of API response ordering (#33).

Remove redundant sort from client.fetch_issues_with_spent_time — the
sort already runs in report_builder.build_grouped_report, so doing it
twice wastes CPU. Also remove the now-unused get_version import (#32).

Closes #14, closes #32, closes #33

tests/test_utils.py

@@ -78,3 +78,35 @@ def test_get_version_none_attribute():
         fixed_version = None
 
     assert get_version(MockIssue()) == "<N/A>"
+
+
+def test_get_version_with_redminelib_version_object():
+    """redminelib Version: str() возвращает ID, .name — человекочитаемое имя."""
+
+    class MockVersion:
+        """Имитирует redminelib.resources.Version — str() даёт ID."""
+
+        def __init__(self, vid, name):
+            self.id = vid
+            self.name = name
+
+        def __str__(self):
+            return str(self.id)
+
+    class MockIssue:
+        fixed_version = MockVersion(42, "v2.5.0")
+
+    assert get_version(MockIssue()) == "v2.5.0"
+
+
+def test_get_version_falls_back_to_str_when_no_name():
+    """Если у объекта версии нет .name — fallback на str()."""
+
+    class MockVersionNoName:
+        def __str__(self):
+            return "fallback-id"
+
+    class MockIssue:
+        fixed_version = MockVersionNoName()
+
+    assert get_version(MockIssue()) == "fallback-id"