refactor: hmr

[Nirvana-Jie]

Description:
refactor: hmr

BREAKING CHANGE:
None

Related issue (if exists):
None

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Latest commit: 9835a25

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[Copilot]

Pull Request Overview

This PR refactors the HMR (Hot Module Replacement) system by breaking down the monolithic HmrEngine class into specialized components for better separation of concerns.

• Splits HMR functionality into coordinator, broadcaster, and error handler components
• Introduces an update queue system with priority and deduplication support
• Improves error handling and retry mechanisms for HMR operations

Reviewed Changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
packages/core/src/server/index.ts	Reorders HMR engine initialization to occur after websocket server setup
packages/core/src/server/hmr/updateQueue.ts	Adds new update queue management with batching and priority support
packages/core/src/server/hmr/index.ts	Provides exports for the new HMR module components
packages/core/src/server/hmr/hmrErrorHandler.ts	Implements centralized error handling with retry logic and error history
packages/core/src/server/hmr/hmrCoordinator.ts	Coordinates HMR update process with queue management and compilation
packages/core/src/server/hmr/hmrBroadcaster.ts	Handles broadcasting update messages to WebSocket clients
packages/core/src/server/hmr-engine.ts	Refactored to use the new component-based architecture
.changeset/spicy-kings-shave.md	Adds changeset entry for the HMR refactoring

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