fix(chat): selection actions stay dismissed after a click on app chrome

[emirhanyesilgul]

What?

After #380, clicking a non-selectable part of the app (the sidebar, the chat list, the transcript gutter) no longer brings the Cite/Comment actions back.

Why?

Found while testing #380 on Windows (comment). App chrome is user-select: none, so a click there doesn't collapse the selection. pointerdown dismissed the toolbar, then pointerup re-read the still-valid selection and showed it again. Not Windows-specific.

How?

A dismissed selection stays dismissed until the selection changes: dismiss() sets a flag, selectionchange clears it, and readSelection does nothing while it's set. Escape, scroll and resize go through the same dismiss(), so a later click elsewhere no longer revives the toolbar after those either. A new drag, a double-click or Shift+Arrow changes the selection, so the toolbar comes back as before.

New test: a press on chrome and on the viewport, then Escape followed by a click elsewhere, keep the toolbar hidden while the selection stays. Fails without the fix.

Verified on Windows 11 in Atlas Dev: a sidebar click and a gutter click dismiss and stay dismissed; Escape then a sidebar click stays dismissed; Shift+Arrow brings it back; Cite still works. src/features/chat 708 passed, full bun run test in the pre-push hook.

After a sidebar click, the selection is kept and the actions stay hidden:

Checklist

• Targets the current version branch (0.4.1)
• New behaviour has a test; a bug fix has a test that fails without it
• You've run the app and used the change in a window

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