feat(docs): update docs about fonts + proguard rules

[CristiCeban]

Follow-up to #1473. Two small changes found while testing 5.4.1-canary-20261005140324 on a React Native 0.87 app that uses React Native Skia:

1. Docs: Android asset output and fonts

• api/loaders/assets-loader.md said Android assets go only to drawable-*. In release builds they actually go to drawable-*, font or raw depending on type. Since fix: support Android font assets in Skia #1473, font files are written to both font and raw, and raw/keep.xml is generated. I added a table of where each asset type goes, explained why fonts are written twice and what keep.xml is for, and noted that dev-server builds and remote assets don't use this layout.
• New guide docs/guides/fonts.md:
  • Loading fonts from JS (e.g. Skia useFont(require(...))): works without setup.
  • Native <Text fontFamily>: React Native doesn't look up fonts in res/font by itself. Link fonts natively (recommended), or register the Re.Pack-emitted resource with ReactFontManager.addCustomFont (release builds only).
  • .ttc: not in the default asset extensions, so it needs an extra loader rule.

2. Android: consumer R8 rules

With minifyEnabled true, release builds of apps using Re.Pack fail:

ERROR: R8: Missing class com.google.errorprone.annotations.CanIgnoreReturnValue
(referenced from: com.nimbusds.jose.shaded.gson.GsonBuilder ...)

The Gson copy bundled inside nimbus-jose-jwt (used for code signing, bumped to 10.8 in #1358) references Error Prone annotations, which are only needed at compile time. Re.Pack ships no consumer R8 rules, so each app currently has to add a -dontwarn itself. This PR adds android/consumer-rules.pro with -dontwarn com.google.errorprone.annotations.** and wires it up through consumerProguardFiles, so R8 builds work without app changes.

Alternative: document the rule for users to add (as requested in #1198). Shipping it with the library seemed better because it fixes the build for everyone without extra setup.

Not included: the Gson TypeToken keep rules for code signing from #1198. They weren't tested with R8 here, and they would need to target the shaded package (com.nimbusds.jose.shaded.gson).

Test plan

Test app: RN 0.87.1, @callstack/repack@5.4.1-canary-20261005140324, @shopify/react-native-skia@2.14.0, with TTF, OTF and TTC fonts loaded through Skia useFont(require(...)) and native <Text fontFamily>.

R8 consumer rules (Android release, minifyEnabled true + shrinkResources true)

Re.Pack android/build.gradle	Result
Canary as published	❌ Missing class com.google.errorprone.annotations.CanIgnoreReturnValue
Canary + consumerProguardFiles "consumer-rules.pro"	✅ Builds, app runs, all fonts load

The app had no -dontwarn rules of its own in either run.

Docs

• pnpm build in website/ succeeds with no broken-link warnings.
• /docs/guides/fonts renders and appears in the Guides sidebar.
• The links between the fonts guide and /api/loaders/assets-loader#android-resource-directories, and to /api/utils/constants#asset_extensions, resolve.
• The fonts guide is based on behavior checked in the test app:
  • Android: release build with shrinking checked on an emulator, debug build with the dev server.
  • iOS: iOS 27 simulator, release and debug.
  • Skia loads fonts in all of these.
  • Native <Text>: natively linked fonts render in all builds; addCustomFont with the Re.Pack font resource works in Android release only.

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🦋 Changeset detected

Latest commit: 65ed637

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

This PR includes changesets to release 6 packages

Name	Type
@callstack/repack	Patch
@callstack/repack-plugin-expo-modules	Patch
@callstack/repack-plugin-nativewind	Patch
@callstack/repack-plugin-reanimated	Patch
@callstack/repack-dev-server	Patch
@callstack/repack-init	Patch

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