fix(web): thread title button no longer eats the drag area

[nathangerday]

What Changed

Remove flex-1 from the server-thread title button in ChatHeader.

This keeps the button's clickable area limited to the title and chevron instead of stretching across the remaining header space.

Why

The title button introduced in #5592 inherited flex-1 from the previous non-interactive <h2>.

As a result, its invisible clickable area extended toward the right-side controls, preventing that part of the title bar from being used to drag the desktop window.

min-w-0 remains on the button and the inner <h2> still uses truncate, so long thread titles continue to ellipsize.

Fixes #5631

UI Changes

Before

After

Recording.2026-08-09.183731.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

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Note

Low Risk
Single Tailwind class removal on a header button; no auth, data, or API changes.

Overview
Restores window dragging on the chat header for server threads by shrinking the thread-title action button’s hit target.

The server-thread title <button> no longer uses flex-1, so it only covers the title text and chevron instead of stretching toward the right-side controls. min-w-0 on the button and truncate on the inner <h2> are unchanged, so long titles still ellipsize.

^{Reviewed by Cursor Bugbot for commit db45048. Bugbot is set up for automated code reviews on this repo. Configure here.}

Note

Fix thread title button in ChatHeader to stop consuming drag area

Removes flex-1 from the thread title button's className in ChatHeader.tsx, so the button no longer stretches to fill remaining horizontal space. The button now sizes to its content, freeing the drag area alongside it.

^{Macroscope summarized db45048.}

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[macroscopeapp]

Approvability

Verdict: Approved db45048

This is a simple CSS-only fix removing flex-1 from a button's class list, preventing the element from expanding into the drag area. No logic changes - purely a layout fix.

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