refactor(web): the sidebar's thread rows live in their own file

Move SidebarThreadRow, SortableThreadRow, the search result row and their
tooltip, provider stack, snooze menu and time-label helpers from Sidebar.tsx
into sidebar/SidebarThreadRow.tsx. No behavior change.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
12757e8bc5Julius Marminge committed on 10/21/2026, 6:53:32 AMparent6a6c84f

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