chore: update packageManager to pnpm@11.12.0

[Yunusabdul38]

Migrates the workspace from pnpm v9 to pnpm v11.

• Updated packageManager to pnpm@11.12.0 across the project.
• Moved overrides and configured allowBuilds in pnpm-workspace.yaml to comply with pnpm v11 workspace rules.
• Upgraded Node.js to version 22 in the CI install-deps action (pnpm v11 requires Node.js >=22.13 for node:sqlite).

Validation: Clean install, lint, typecheck, and build all pass successfully.

Fix: #292

[changeset-bot]

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Latest commit: a251575

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[MrImmortal09]

@fedimint-bot review

[fedimint-bot]

LGTM

[MrImmortal09]

@fedimint-bot why is the iOS test failing?

[fedimint-bot]

iOS failure analysis

The failing check is React Native Verify / Build iOS, not the JS checks. The primary failure happens inside nix develop --accept-flake-config -c just build-ios while prebuilding the iOS UniFFI Rust library for aarch64-apple-ios:

• Nix fails building fedimint-client-uniffi-aarch64-apple-ios-...-deps.
• The failing dependency is the proc-macro2 build script.
• The linker reports missing arm64 symbols such as _unlinkat, _waitpid, and _writev, then ends with ld: symbol(s) not found for architecture arm64 / clang: error: linker command failed.

The later TypeScript error:

Cannot find module './generated/fedimint_client_uniffi'

is fallout from that earlier Rust/Nix iOS build failure: the generated UniFFI bindings never get produced, so @fedimint/react-native-bindings cannot build declarations.

This does not look specific to the pnpm 11 change in this PR. I checked a newer React Native Verify run from another PR and it fails in the same iOS Nix step with the same proc-macro2 / arm64 linker error while still using pnpm 9.15.9. Android passes in both runs.

One extra note: the iOS workflow does not use the changed .github/actions/install-deps action. It enters the Nix iOS shell directly, and that shell currently provides Node v24.11.1, which explains the Unsupported engine: wanted {"node":"22.x"} warnings. Those warnings are worth cleaning up separately, but they are not the terminal failure here.

[Ayush4958]

@MrImmortal09 ,
I think this PR needs re-run for CI