Release v0.2.1 bugfixes and packaging hardening

[SSobol77]

Summary

• Fix PyPI/wheel/sdist icon packaging and add explicit Linux desktop launcher installation command.
• Preserve source indentation in the editor.
• Fix UTF-8/Cyrillic decoding regression caused by false MacRoman detection.
• Add SUSE/openSUSE, Slackware, Arch Linux, and Nix/NixOS packaging support/docs.
• Normalize release artifact naming across Linux package formats.
• Prepare v0.2.1 changelog and release notes.

Tests

• python3 -m pytest
• python3 -m build
• Verified wheel contains ecli/assets/ecli.png
• Verified sdist contains src/ecli/assets/ecli.png

Local verification

220 passed
Successfully built ecli_editor-0.2.1.tar.gz and ecli_editor-0.2.1-py3-none-any.whl
OK: v0.2.1 build artifacts and icon packaging verified

Notes

Do not publish or tag v0.2.1 before this PR passes CI and is merged into main.

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[sonarqubecloud]

Quality Gate passed

Issues
6 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud