Improve exhale note QR sizing for scan reliability

[kojibai]

Motivation

• Make the QR on the Exhale Note larger and better centered so it scans and clicks like the verifier-download PNG (improve quiet zone and label spacing for camera scanners).

Description

• Increased the Exhale Note QR slot from 110 to 140 pixels and adjusted the QR container height and label position.
• Increased the QR generator margin passed to makeQrSvgTagSafe from 2 to 3 to provide a larger quiet zone for more reliable scanning.
• Re-centered the rendered SVG QR by computing integer offsets against the updated slot size.

Testing

• Started the dev server with npm run dev and it launched successfully.
• Ran a visual smoke test using Playwright to load /verify and captured a screenshot (artifacts/exhale-note-verify.png) which completed successfully.
• No unit test suite was executed as part of this change.

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Codex Task

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Project	Deployment	Actions	Updated (UTC)
phi-network-5aii	Ready	Preview, Comment	Jan 31, 2026 4:59am

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