fix(react): exact uint64/uint128 maxValue in FheTypesList

[Ravan002]

FheTypesList builds its max values as BigInt(2 ** n - 1). The subtraction happens on a float first, and for 64 and 128 bits 2 ** n - 1 isn't representable, so it rounds back up to 2 ** n:

> FheTypesList.find(t => t.value === 'uint64').maxValue
before: 18446744073709551616n   (2^64)
after:  18446744073709551615n   (2^64 - 1)

> FheTypesList.find(t => t.value === 'uint128').maxValue
before: 340282366920938463463374607431768211456n   (2^128)
after:  340282366920938463463374607431768211455n   (2^128 - 1)

CofheEncryptInput validates against this list, so it accepted 2^64 for a uint64 input; the SDK then rejected it at encrypt time. All entries now use bigint math (2n ** 64n - 1n); 8/16/32 bit were already exact and don't change.

Test: packages/react/src/utils/utils.test.ts, which checks every uint type (uint64 and uint128 fail on master). The react suite passes (83).

[changeset-bot]

🦋 Changeset detected

Latest commit: e50f9fc

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

This PR includes changesets to release 9 packages

Name	Type
@cofhe/react	Patch
@cofhe/example-react	Patch
@cofhe/abi	Patch
@cofhe/foundry-plugin	Patch
@cofhe/hardhat-3-plugin	Patch
@cofhe/hardhat-plugin	Patch
@cofhe/mock-contracts	Patch
@cofhe/sdk	Patch
@cofhe/site	Patch

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