FileDisputeModal doesn't trap focus

[mftee]

The dispute modal doesn't implement a focus trap, so keyboard/screen-reader users can tab out of the open modal into background page content.

[akandeisaac021-design]

@akandeisaac021-design has applied to work on this issue as part of the Stellar Wave Program's 9th wave.

Hi there, I'd like to contribute to this.

I'll implement this following the existing conventions in the codebase, with tests covering the new behavior.

Looking forward to contributing — please assign this issue to me

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[phertyameen]

@phertyameen has applied to work on this issue as part of the Stellar Wave Program's 9th wave.

Can I please work on this issue?

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[drips-wave]

Congratulations, @phertyameen! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on September 30, 2026.

🧑‍💻 @phertyameen: Please resolve the issue such that the repo's maintainers have enough time to review your contribution before the due date. You'll earn Points for completing the issue on-time, which will make you eligible for a share of the Stellar Wave Program's reward pool.

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[grantfox-oss]

🎉 This issue has been marked as completed on GrantFox!

@phertyameen's PR #1420 was approved and merged by @mftee.

🏆 @phertyameen: You earned 40 FoxPoints for this contribution! Your current tier: Builder (1,618 total points). Track your full progress on GrantFox.

👏 Great work, @phertyameen! Keep contributing to CodeGirlsInc.

[drips-wave]

This issue has been completed by @phertyameen as part of the Stellar Wave Program's 9th Wave 🥳

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