fix(metro): replace unmaintained image-size dependency

[ufolux]

Summary

Metro only needs dimensions for its explicitly supported asset formats. The generic image-size detector also enables unrelated parsers, including JXL, HEIF, JP2, and ICNS parsers affected by CVE-2025-71329 and CVE-2025-71330.

This change:

• replaces the archived image-size dependency with an exact probe-image-size@7.3.0 dependency
• selects one parser from probe-image-size/sync based on Metro's existing asset type allowlist instead of auto-detecting content
• adds a small Metro-owned KTX1/KTX2 header parser
• rejects malformed and format-mismatched image assets with a contextual error
• reuses the first asset Buffer already read for hashing and removes image-size from yarn.lock

Changelog: [Fix] Select image parsers by Metro asset type and replace the unmaintained image-size dependency

Fixes #1607
Refs #1762

Test plan

• ./node_modules/.bin/flow check
• node node_modules/eslint/bin/eslint.js . --cache
• node node_modules/prettier/bin/prettier.cjs --check .
• node scripts/build.js
• node node_modules/jest/bin/jest.js --runInBand --silent — 141/141 suites passed; 2564 tests passed, 14 skipped, 0 failed
• Added regression coverage for PNG, JPEG, GIF, BMP, WebP, PSD, SVG, TIFF, KTX1, KTX2, format mismatches, truncated headers, and malformed JXL/HEIF/ICNS zero-length payloads.

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