Add focus trap for marketplace filter panel when open

[aniokedianne]

Summary
The marketplace filter panel, when open, does not trap focus inside it. Keyboard users can tab out of the panel into the background content behind it, which breaks the expected interaction model for overlay panels.

Scope

• identify the marketplace filter panel open state
• add a focus trap that keeps keyboard focus inside the panel while it is open
• release the trap and return focus to the trigger when the panel closes

Acceptance Criteria

• tabbing while the filter panel is open cycles through panel controls only
• closing the panel returns focus to the element that opened it
• the trap does not interfere with focus behavior when the panel is closed

Contributor coordination: if you pick this up, reach out in Telegram for updates or clarification: https://t.me/accesslayerorg

[Biokes]

@Biokes has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

Hi maintainer
I will like to work on this issue
ETA 3hrs

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[nomsoscript]

@nomsoscript has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

Hi maintainer, I'd love to tackle this issue. kindly assign

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[cladiousdoff-glitch]

@cladiousdoff-glitch has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

I would like to work on this issue

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