fix(useJwt)!: rename jwt_decode to jwtDecode

[root5427]

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Description

Renamed jwt_decode to jwtDecode for compatibility with jwt-decode package's latest release

• fixes useJwt 不支持 jwt-decode 4.0（useJwt does not support jwt-decode 4.0） #3508

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🤖 Generated by Copilot at 3a9fe5d

Updated the useJwt integration to use a newer API of jwt-decode. Fixed the import and usage of jwtDecode in packages/integrations/useJwt/index.ts.

🤖 Generated by Copilot at 3a9fe5d

• Replace deprecated default export of jwt-decode with named export jwtDecode (link,link)

[TheVaan]

Please merge this PR, as it upgrades jwt-decode to latest version! The latest version has several internal improvements in bundle size etc.