feat: add --my-tasks mode for open assigned issues (#71)

List open Redmine issues assigned to the current (or overridden) user,
sorted by priority rank (P1..P5) then version due date with a stable id
tie-break. Renders an OSC 8 hyperlinked console table on stdout and a
counts/hours summary line on stderr; version due dates are fetched once
per unique version, unavailable versions degrade to an empty due date.

Also migrates the codebase to ruff 0.17.3 defaults (PEP 585/604
annotations, targeted noqa for intentional blind excepts and CLI root
logging). Behavior-neutral: 408 tests pass with -W error.

tests/test_utils.py

@@ -110,3 +110,21 @@ def test_get_version_falls_back_to_str_when_no_name():
         fixed_version = MockVersionNoName()
 
     assert get_version(MockIssue()) == "fallback-id"
+
+
+def test_get_version_custom_default():
+    """Явный default заменяет <N/A>, когда версия не назначена."""
+
+    class MockIssue:
+        pass
+
+    assert get_version(MockIssue(), default="") == ""
+
+
+def test_get_version_custom_default_not_used_when_version_present():
+    """При наличии версии default не применяется."""
+
+    class MockIssue:
+        fixed_version = "v1.0"
+
+    assert get_version(MockIssue(), default="") == "v1.0"