Add changelog entry for version 0.6.1 post-RC PRs

[M-Nikox]

This pull request updates the project changelog for the 0.6.1 release, summarizing all notable changes and security updates included since the previous release candidate. The main focus is on documenting dependency updates and related security improvements.

Dependency updates:

• Added post-release-candidate dependency updates from PRs Bump tar from 7.5.16 to 7.5.22 #36 through Bump js-yaml from 4.3.0 to 4.3.1 #44, including upgrades to tar, electron-builder, app-builder-lib, postcss, nanoid, electron-updater, builder-util-runtime, undici, fast-uri, and js-yaml.
• Performed a lockfile security refresh with transitive dependency updates, notably including js-yaml 4.2.0 → 4.3.0.

Security improvements:

• Documented that all security fixes from 0.6.1-rc are included, and highlighted further advisory-driven updates, including hardening for undici v7.29.0, fast-uri v3.1.5, and js-yaml v4.3.1.

[Copilot]

Pull request overview

Updates CHANGELOG.md to document the finalized 0.6.1 release notes, capturing post-0.6.1-rc dependency/security updates so the release record stays complete and auditable.

Changes:

• Added a new 0.6.1 changelog section dated 2026-08-12.
• Summarized post-RC dependency bumps (PRs #36–#44) including key version deltas.
• Added a Security subsection explicitly calling out advisory-driven updates included in 0.6.1.

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