Add qr code button for mobile enhancement#76
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NathanTarbert merged 6 commits intomainfrom Apr 2, 2026
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Adds a QR button in the top banner that opens a modal with a scannable QR code. Audience members scan it, pick from 3 random visualization options, and the selected prompt is sent to the AI agent on the big screen.
Prevents stale closure issues when the setTimeout fires after modal close. Also stops polling immediately after first pick to avoid duplicate agent runs.
- Move ref updates into effects to satisfy react-hooks/refs rule - Remove synchronous setState in effects (set-state-in-effect rule) - Compute non-localhost URL eagerly in usePickUrl initializer
Use a ref-based guard (pickedRef) to ensure sendPrompt is called exactly once, regardless of effect re-runs or in-flight fetch races. Also generate a fresh session ID each time the modal opens.
The GET endpoint now clears the prompt from the session after the first read. Subsequent polls see status "picked" but no prompt, so even if multiple fetches are in flight only the first one gets the prompt to send to the agent.
Session ID is now generated on modal open (not mount), so the URL hook must react to changes. Restructured usePickUrl to derive the URL via useMemo and only use an effect for the localhost LAN IP fetch.
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