fix: fix unclosable diff panel

[atharvadeosthale]

What Changed

Fixed unclosable diff panel

Why

Because it'd open and never close again

Closes #931

UI Changes

Before

Clipboard-20260311-185852-849.mp4

After

T3.Code.Alpha.mp4

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

Fix unclosable diff panel by clearing diff query params and adding click-outside handler

• Introduces clearDiffSearchParams in diffRouteSearch.ts that explicitly sets diff, diffTurnId, and diffFilePath to undefined (rather than omitting them), ensuring TanStack Router removes the params from the URL.
• Updates onToggleDiff in ChatView.tsx and closeDiff in _chat.$threadId.tsx to use clearDiffSearchParams instead of stripDiffSearchParams.
• Adds a full-screen transparent overlay in DiffPanelInlineSidebar that closes the diff panel on click-outside, and raises the sidebar's z-index with z-20.

^{Macroscope summarized e660ba0.}

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[chuks-qua]

@atharvadeosthale, could you please add closing tag
closes #931

[chuks-qua]

remove out of scope change

[chuks-qua]

@atharvadeosthale could you revert this change please

[atharvadeosthale]

@chuks-qua This was not a manual change - is it okay to revert regardless?

[chuks-qua]

best to revert and leave changes like these for theo or julius, they prefer to maintain things like this

[maria-rcks]

closing in favor of #937 (sorry)