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

redmine_reporter/utils.py

@@ -33,7 +33,8 @@ def get_version(issue) -> str:
     version = getattr(issue, "fixed_version", None)
     if version is None:
         return "<N/A>"
-    return str(version)
+    name = getattr(version, "name", None)
+    return str(name) if name else str(version)
 
 
 def hours_to_human(hours: float) -> str: