chore(socket): rename message types for better clarity

[chenjiahan]

Summary

Rename 'SocketMessage' to 'ServerMessage' and 'ClientMessageRuntimeError' to 'ClientMessageError' to better reflect their purpose and improve code readability.

Also update related type names and references across the codebase.

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).

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[Copilot]

Pull Request Overview

Rename socket message types to better reflect their purpose: 'SocketMessage' to 'ServerMessage' and 'ClientMessageRuntimeError' to 'ClientMessageError'. This improves code clarity by distinguishing server-to-client messages from client-to-server messages.

• Renamed SocketMessage union type to ServerMessage to clarify server-to-client communication
• Renamed ClientMessageRuntimeError to ClientMessageError and updated its type value from 'runtime-error' to 'client-error'
• Updated all type references and usages across the codebase to maintain consistency

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
packages/core/src/server/socketServer.ts	Core type definitions updated with new names and consolidated message type unions
packages/core/src/server/devServer.ts	Updated type imports and generic type parameters to use ServerMessage
packages/core/src/server/browserLogs.ts	Updated import and function parameter to use ClientMessageError
packages/core/src/client/hmr.ts	Updated imports, message handling, and client error reporting to use new type names

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