Sidebar favorites reset during v2 migration

What changed

Cherry Studio v2 resets migrated sidebar favorites to Chat, Agents, Translation, Paintings, and Knowledge Base. Legacy visible and hidden sidebar icon settings are not preserved.

Why this matters to the user

Users who customized the v1 sidebar will see the canonical five-tab layout after upgrading to v2.

What the user should do

Review the sidebar after upgrading and reapply any preferred customization.

Notes for release manager

This replaces the earlier migration behavior that rebuilt favorites from the legacy visible sidebar icon list.