feat(pdfkit): use fflate instead of zlib in the browser build

[diegomura]

Applies foliojs/pdfkit#1760 to our fork. The browser build no longer imports Node's zlib, so consumers don't need a bundler polyfill for it, and browserify-zlib and pako (plus their alias workarounds in the rollup config) are gone from the dependency tree.

Both deflateSync call sites now go through src/zlib.js, which picks fflate's zlibSync or native zlib off the BROWSER constant, so each bundle keeps only one compressor after tree-shaking — verified in the built output. fflate returns a plain Uint8Array, which the bundled Buffer polyfill's concat rejects, so the browser branch wraps it in Buffer.from; PDFDocument._write also takes upstream's instanceof Uint8Array check.

Tests: the existing PNG test now flips BROWSER with vi.stubGlobal instead of mocking the zlib module (which needed a vitest setup file defining BROWSER for the package). Full suite passes, and the browser bundle was checked end to end by rendering text plus an interlaced PNG.

🤖 Generated with Claude Code

[changeset-bot]

🦋 Changeset detected

Latest commit: 5489b94

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 12 packages

Name	Type
@react-pdf/pdfkit	Patch
@react-pdf/font	Patch
@react-pdf/renderer	Patch
@react-pdf/types	Patch
@react-pdf/math	Patch
@react-pdf/mermaid	Patch
next-14	Patch
next-15	Patch
@react-pdf/vite-example	Patch
@react-pdf/layout	Patch
@react-pdf/render	Patch
@react-pdf/stylesheet	Patch

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