Migrates to call useAllowance lib

[arielmergen]

Description

Migrates stakeOperation.tsx to call @hemilabs/react-hooks/useAllowance directly, removing the dependency on the local wrapper hooks/useAllowance.

Scope

This PR is intentionally limited to one file only:

• portal/app/[locale]/stake/_components/manageStake/stakeOperation.tsx

What changed

• Replaced import { useAllowance } from 'hooks/useAllowance' with @hemilabs/react-hooks/useAllowance (lib direct call).
• The native-token guard, previously implicit inside the wrapper, is now explicit at the call site via query: { enabled: !operatesNativeToken }.
• AllowanceQuery type defined locally to handle the enabled field, which the lib omits from its query type signature but supports at runtime.
• UseQueryOptions and Address imported as type only — no runtime impact.

What did not change

• StakeOperation component public API is unchanged.
• allowance and isPending fields preserve the same semantics for consumers.
• Runtime behavior is identical.

Architecture notes

• AllowanceQuery is duplicated between this file and hooks/useAllowance.ts. This is intentional and temporary — the local wrapper will be removed in PR 4.4 once all callers are migrated.
• No new runtime dependencies introduced. @tanstack/react-query was already a project dependency.

Validation

• Lint passes (no errors, no warnings).
• portal build and type-check passes.
• No tests exist for this component. N/A.

Related issue(s)

Related to #1843

Checklist

• Manual testing passed.
• Automated tests added, or N/A. (N/A)
• Documentation updated, or N/A. (N/A)
• Environment variables set in CI, or N/A. (N/A)

[Copilot]

Pull request overview

This PR updates the Portal stake flow to use the shared @hemilabs/react-hooks useAllowance hook instead of the Portal-local implementation.

Changes:

• Switch useAllowance import from hooks/useAllowance to @hemilabs/react-hooks/useAllowance.
• Update the useAllowance call site to the new hook API shape (owner/spender/token + react-query query options).
• Add local typing (AllowanceQuery) to constrain/shape the query options passed into the hook.

[Copilot]

Pull request overview

Copilot reviewed 1 out of 1 changed files in this pull request and generated no new comments.