feat: output path defaults (#43) + datetime precision & dedup (#47)

#43 — Имя файла и пути по умолчанию:
- resolve_output_path() в yaml_config.py: резолвит --output с учётом
  output.dir, filename_template, default_format из YAML-конфига
- Bare format (xlsx/odt/...) → путь по шаблону
- Без расширения → автодописывается default_format (.xlsx)
- Config.get_output_dir/filename/default_format()

#47 — datetime precision и дедупликация:
- period.last_used.from/to в YAML-конфиге и AppConfig
- period.precision: date|datetime
- _compute_dedup_cutoff() в cli.py: при precision=datetime вычисляет
  cutoff из period.last_used.to
- _parse_datetime() + AND-логика дедупликации в client.py:
  запись исключается если created_on И updated_on < cutoff
- Пропуск issues без часов после дедупликации

Closes #43
Closes #47

tests/test_config.py

@@ -154,6 +154,9 @@ period:
   default_from: "2026-06-01"
   default_to: "2026-06-30"
   dynamic: true
+  last_used:
+    from: "2026-06-30T09:00:00"
+    to: "2026-06-30T12:00:00"
 
 output:
   dir: ~/reports
@@ -196,6 +199,8 @@ class TestAppConfigFromYaml:
             assert cfg.period_default_from == "2026-06-01"
             assert cfg.period_default_to == "2026-06-30"
             assert cfg.period_dynamic is True
+            assert cfg.period_last_used_from == "2026-06-30T09:00:00"
+            assert cfg.period_last_used_to == "2026-06-30T12:00:00"
             assert cfg.output_dir == "~/reports"
             assert cfg.output_filename == "{author}_{from}_{to}.{ext}"
             assert cfg.output_default_format == "xlsx"
@@ -387,3 +392,62 @@ class TestConfigYamlFallback:
             clear=True,
         ):
             assert Config.get_default_date_range() == "2026-07-01--2026-07-15"
+
+
+class TestConfigPeriodPrecision:
+    """Tests for period.precision and period.last_used."""
+
+    @mock.patch.dict(os.environ, {}, clear=True)
+    def test_get_period_precision_defaults_to_date(self):
+        """Без YAML-конфига precision == 'date'."""
+        Config._app = None
+        assert Config.get_period_precision() == "date"
+
+    @mock.patch.dict(os.environ, {}, clear=True)
+    def test_get_period_precision_from_yaml(self):
+        with tempfile.TemporaryDirectory() as tmp:
+            yaml_path = Path(tmp) / "config.yml"
+            yaml_path.write_text("period:\n  precision: datetime\n")
+
+            Config._app = AppConfig.from_yaml(yaml_path)
+            assert Config.get_period_precision() == "datetime"
+
+    @mock.patch.dict(os.environ, {}, clear=True)
+    def test_get_last_used_from_yaml(self):
+        with tempfile.TemporaryDirectory() as tmp:
+            yaml_path = Path(tmp) / "config.yml"
+            yaml_path.write_text(
+                "period:\n  last_used:\n    from: '2026-06-30T09:00:00'\n    to: '2026-06-30T12:00:00'\n"
+            )
+
+            Config._app = AppConfig.from_yaml(yaml_path)
+            assert Config.get_last_used_from() == "2026-06-30T09:00:00"
+            assert Config.get_last_used_to() == "2026-06-30T12:00:00"
+
+    @mock.patch.dict(os.environ, {}, clear=True)
+    def test_get_last_used_returns_empty_when_not_set(self):
+        Config._app = AppConfig()
+        assert Config.get_last_used_from() == ""
+        assert Config.get_last_used_to() == ""
+
+    @mock.patch.dict(os.environ, {}, clear=True)
+    def test_yaml_loads_last_used_field(self):
+        with tempfile.TemporaryDirectory() as tmp:
+            yaml_path = Path(tmp) / "config.yml"
+            yaml_path.write_text(
+                "period:\n  last_used:\n    from: '2026-07-01T08:00:00'\n    to: '2026-07-01T18:00:00'\n"
+            )
+
+            cfg = AppConfig.from_yaml(yaml_path)
+            assert cfg.period_last_used_from == "2026-07-01T08:00:00"
+            assert cfg.period_last_used_to == "2026-07-01T18:00:00"
+
+    @mock.patch.dict(os.environ, {}, clear=True)
+    def test_yaml_without_last_used_has_empty_fields(self):
+        with tempfile.TemporaryDirectory() as tmp:
+            yaml_path = Path(tmp) / "config.yml"
+            yaml_path.write_text("period:\n  precision: date\n")
+
+            cfg = AppConfig.from_yaml(yaml_path)
+            assert cfg.period_last_used_from == ""
+            assert cfg.period_last_used_to == ""