feat(web): enhance sidebar thread interaction with new row button and context menu options

[SunkenInTime]

What Changed

Why

Currently whenever you minimize a folder that you're currently viewing a thread within, the thread isn't visible in the side bar. So the change is to persist the current thread right below the minimized folder, which then disappears once navigated away from

UI Changes

Before:
https://l7y6qjyp5m.ufs.sh/f/usun6XPoM0UCUsMcBu84th6DKGW5HSvxpy8cINPrY4sV0bq9
After:
https://l7y6qjyp5m.ufs.sh/f/usun6XPoM0UCUnh8xr4th6DKGW5HSvxpy8cINPrY4sV0bq9l

Checklist

• This PR is small and focused
• I explained what changed and why
• I included before/after screenshots for any UI changes
• I included a video for animation/interaction changes

Note

Auto-expand and center active thread in sidebar thread list

• The sidebar thread list now auto-expands when the active thread falls beyond the preview limit, and splits the visible list to render the active thread in context (threads above, active row, threads below).
• 'Show more'/'Show less' controls are only shown when manual expansion is applicable (hidden when auto-expansion is forced).
• Thread row rendering is extracted into helper functions (renderThreadRowButton, renderThreadListItem, renderThreadListToggleButton) in Sidebar.tsx.
• Behavioral Change: The data-thread-item attribute moves from the list item container to the inner clickable button element.

^{Macroscope summarized 46aa3d3.}

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