Streamline playground GitHub and export actions

[a-baran-orhan]

What changed

• Point the playground GitHub action directly to the repository instead of the new-issue form.
• Replace the separate BVH and glTF download buttons with a single desktop Export menu.
• Add descriptive export choices, outside-click and Escape dismissal, arrow-key navigation, focus management, and status feedback on the Export trigger.
• Preserve the existing mobile behavior by keeping desktop pipeline exports hidden below the mobile breakpoint.

Why

The GitHub label implied repository navigation but opened issue creation, and the two always-visible export buttons made the desktop topbar unnecessarily crowded. Grouping the formats under one explicit Export action makes the toolbar cleaner without removing either workflow.

Impact

Desktop users get a simpler topbar and an accessible format picker. Mobile layout remains unchanged. Exported BVH and GLB files retain their existing generation behavior.

Validation

• npm run typecheck
• npm run build -w playground
• Browser verification at desktop and mobile breakpoints
• Verified Escape dismissal, outside-click behavior, arrow-key focus movement, and absence of console errors

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Project	Deployment	Actions	Updated (UTC)
posecode	Ready	Preview, Comment	Jul 28, 2026 8:08pm