chore: add changeset for v3.28.1

[mrubens]

Important

Add changeset for v3.28.1 with new features, fixes, and release notes.

• Features:
  • Announce Roo Code Cloud.
  • Add cloud task button for opening tasks in Roo Code Cloud.
  • Make Posthog telemetry the default.
• Fixes:
  • Show notification when checkpoint initialization fails.
  • Bust cache in generated image preview.
  • Center active mode in selector dropdown on open.
  • Preserve first message during conversation condensing.
• Misc:
  • Add changeset file .changeset/v3.28.1.md with release notes and image.

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