Add account deletion changelog item

[Roma36]

Description of the change

Checklist

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Note

Adds a 2025-10-27 changelog entry for improved account deletion UX and process.

• Docs — Changelog (docs/product/changelog.md):
  • Add 2025-10-27 "Account Deletion" feature note detailing:
    • Move to dedicated settings tab
    • Confirmation modals and two-step flow
    • 7-day waiting period post-mark
    • Feedback collection on deletion reasons

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[peterdeme]

@Roma36 did you mean to merge this? (it has merge conflicts btw)

[Roma36]

@peterdeme oh yes, thanks for reminder. I've forgot about it.