chore: bump version to 0.3.1 (#1880)

* chore: bump version to 0.3.1

* fix: correct 0.3.1 CHANGELOG.md entries (#1882)

* Initial plan

* fix: correct 0.3.1 CHANGELOG.md entries - fix truncated title and remove duplicates

Co-authored-by: mnriem <15701806+mnriem@users.noreply.github.com>

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Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: mnriem <15701806+mnriem@users.noreply.github.com>

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Co-authored-by: Copilot <198982749+Copilot@users.noreply.github.com>