feat(react): add React components

[dangreen]

Adds @srcset/react - React components for responsive images.

• Picture - server-compatible <picture> with a <source> per format group ordered by efficiency, and a sizes prop applied to every source
• Image - client <img> with intrinsic size, lazy loading and async decoding by default, blur-up placeholder (once per mount, next/image parity), priority preload with matching request policy, React 19 ref cleanup support
• The published dist splits automatically: modules with a leading 'use client' land in a client chunk with the directive, the server entry stays directive-free
• Reviewed locally in three Codex passes (final pass: no findings)

🤖 Generated with Claude Code

[coveralls]

Coverage Report for CI Build 31188301278

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Coverage: 89.76%

Details

• Patch coverage: 26 of 26 lines across 2 files are fully covered (100%).

Uncovered Changes

No uncovered changes found.

Coverage Regressions

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Coverage Stats

Relevant Lines:	563
Covered Lines:	520
Line Coverage:	92.36%
Relevant Branches:	394
Covered Branches:	339
Branch Coverage:	86.04%
Branches in Coverage %:	Yes
Coverage Strength:	92690.36 hits per line

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💛 - Coveralls