feat(diagram): size box labels independently

[0thernet]

Summary

• add optional positive labelFontSize support for rectangle and ellipse labels
• preserve existing output byte-for-byte when the field is omitted
• propagate the field across schema, parser, SVG, PNG, and tldraw exports
• prepare the additive feature as Atet v3.0.1 across package, desktop, site, install, release, and generated contracts

Verification

• bun run check
• focused schema, parser, render, and export tests
• manual light/dark render inspection in the Sponge presentation consumer

[vercel]

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Project	Deployment	Actions	Updated (UTC)
atet	Ready	Preview	Aug 27, 2026 2:50pm