Adds a "Report a bug" / "Segnala un bug" button (6 languages) in
Help → Info that opens the issue tracker in the system browser via
TopLevel.Launcher (cross-platform: desktop + Android).
URL points to the current self-hosted repo; a TODO comment marks
the constant for easy update once the project moves to GitHub.
Adds .github/ISSUE_TEMPLATE/bug_report.yml — GitHub issue form with
structured fields for version, platform, network, repro steps,
expected behavior, and logs.
