Add helper for detecting if the current device is a mobile viewport

[Chucks1093]

Summary

Several UI decisions (tooltip vs toast, collapsed vs expanded nav) depend on whether the user is on a mobile viewport. A shared helper that reads the window width and returns a boolean should be used consistently instead of inline media query checks scattered across components.

Scope

• Add useIsMobile(): boolean React hook using a window.matchMedia listener with a 768px breakpoint
• Hook updates correctly when the viewport is resized
• Cleans up the media query listener on unmount
• Add unit tests mocking window.matchMedia for mobile and desktop widths

Acceptance Criteria

• Returns true for viewport width below 768px
• Returns false for viewport width at or above 768px
• Updates correctly on viewport resize
• Listener is cleaned up on unmount

ETA: 12 hours

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Coordinate on Telegram

[egwujiohaifesinachiperpetual-max]

@egwujiohaifesinachiperpetual-max has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

please assign to me my ETA is 4hrs

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[Richardkingz2019]

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I would love to work on this issue

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[archanavdev]

@archanavdev has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Hi
I’d like to work on this issue if it’s available. I’m a full-stack Web2 & Web3 developer with solid open-source experience and can start working on it right away.

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