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.

redmine_reporter/formatters/html.py

@@ -1,5 +1,4 @@
 from html import escape
-from typing import List
 
 from ..report_builder import group_rows_by_project_and_version
 from ..types import ReportRow
@@ -12,7 +11,7 @@ class HTMLFormatter(Formatter):
     def __init__(self, **_kwargs):
         super().__init__()
 
-    def format(self, rows: List[ReportRow]) -> str:
+    def format(self, rows: list[ReportRow]) -> str:
         projects = group_rows_by_project_and_version(rows)
 
         lines = [
@@ -79,7 +78,7 @@ class HTMLFormatter(Formatter):
         lines.append("</html>")
         return "\n".join(lines)
 
-    def save(self, rows: List[ReportRow], output_path: str) -> None:
+    def save(self, rows: list[ReportRow], output_path: str) -> None:
         content = self.format(rows)
         with open(output_path, "w", encoding="utf-8") as f:
             f.write(content)