Fix mobile download prompt detection timing

[feynon]

Motivation

• The mobile download prompt sometimes failed to open for homepage/top-nav download taps because device detection was deferred into a state initialized in useEffect, causing the click handlers to be gated until that state was set.
• The global capture listener was similarly gated on a separate mobile state which made interception unreliable immediately after page load.

Description

• Removed the deferred isMobile state from useMobileDownloadPrompt and changed the hook to call isLikelyMobileDevice() at click time so openMobileDownloadPrompt reliably returns true on mobile immediately after load.
• Simplified GlobalMobileDownloadPrompt by removing separate mobile-state gating and performing isLikelyMobileDevice() checks inside the document click handler registered in the capture phase so download link clicks are intercepted consistently.
• Kept existing behavior for skip attributes and same-origin/download-host detection while reducing dependency array complexity and state churn in components/mobile-download-prompt.tsx.

Testing

• Ran npm run lint, which failed in this environment because ESLint configuration was not detected (ESLint couldn't find an eslint.config.(js|mjs|cjs) file).
• Ran npm run build, which failed in this environment due to external Google Fonts TLS/fetch errors during the Next.js build (unrelated to the changed logic) and optional external package warnings from @react-email/render.

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Codex Task

[vercel]

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Project	Deployment	Actions	Updated (UTC)
tiles-next	Ready	Preview, Comment, Open in v0	Apr 18, 2026 6:48am