fix: add accessible labels to sidebar controls

[danyalahmed1995]

Related to #12325

Summary

Adds accessible labels and titles to a few obvious icon only controls in the sidebar/chat UI.This is intended as a small first pass improvement for screen reader support. It does not try to solve the full sidebar accessibility issue in one PR.

Testing

• Ran npm.cmd run lint --prefix gui
• Ran git diff --check

Notes

I kept the scope focused on controls where the action was clear from the existing UI.

---

Summary by cubic

Adds accessible labels and titles to sidebar/chat controls and labels the main chat input for screen readers. Addresses #12325 by clearly labeling close, send, configure, and the chat input.

• Bug Fixes
  • FindWidget: add "Close find widget" aria-label and title to the close button.
  • InputToolbar: add "Send message" aria-label and title to the submit button.
  • ModelSelect: add "Configure " to per-option cog and "Configure models" to the toolbar cog.
  • HeaderButtonWithToolTip: set aria-label and title from the text prop for icon-only header buttons.
  • TipTap editor (main input): add aria-label "Chat message input".

^{Written for commit 0b3ac42. Summary will update on new commits.}

[cubic-dev-ai]

No issues found across 4 files

[danyalahmed1995]

It looks like PR Checks / jetbrains-tests failed, but this PR only changes GUI accessibility attributes in React components.I’m checking the logs now. If this is unrelated, would it be possible to rerun that check?

[danyalahmed1995]

Hmph the failing check is PR Checks / jetbrains-tests, specifically Autocomplete > testAutocomplete() in the JetBrains integration suite.This PR only adds aria-label / title attributes to GUI React components and does not touch the JetBrains extension or autocomplete code, so this looks unrelated to the patch.

[paul-geoghegan]

Hey, great work. Can I make one request for this pr and thats if you could label the input box. I'll make a new issue now for the message history. Thanks!

[danyalahmed1995]

@paul-geoghegan Thank you , I will be able to add the input box label to this PR in an hour or so.

[paul-geoghegan]

@danyalahmed1995 perfect, thanks!

[danyalahmed1995]

@paul-geoghegan Added the input box label in the latest commit.