fix(font): retry font load after a failed fetch

[mskec]

What

FontSource.load() keeps the first _load() promise in a cache. If that call fails, the rejected promise stays in the cache. Every later load() call returns the same rejection. The font never loads again.

This problem is if this happens in a long running container. One failed fetch then breaks each later render that uses the font.

Reproduction

Register a font. Make the first fetch call fail. Render two documents that use the font.

let failNext = true;
const realFetch = globalThis.fetch;
globalThis.fetch = (...args) =>
  failNext
    ? ((failNext = false), Promise.reject(new TypeError('fetch failed')))
    : realFetch(...args);

Font.register({ family: 'Roboto', src: 'https://example.com/Roboto.ttf' });

await renderToBuffer(doc()); // fails, as expected
await renderToBuffer(doc()); // fails, but must succeed

The second render fails with the error from the first render. No second fetch occurs.

Fix

load() removes the cached promise when _load() fails, then re-throws the error. The cache keeps only a successful load.

[changeset-bot]

🦋 Changeset detected

Latest commit: 13f0242

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

This PR includes changesets to release 11 packages

Name	Type
@react-pdf/font	Patch
@react-pdf/renderer	Patch
@react-pdf/types	Patch
@react-pdf/math	Patch
@react-pdf/mermaid	Patch
@react-pdf/ui	Patch
@react-pdf/examples	Patch
@react-pdf/layout	Patch
@react-pdf/render	Patch
@react-pdf/stylesheet	Patch
@react-pdf/tailwind	Patch

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