webpack-plugin: Move implementation from feat/new-plugin branch

[Copilot]

Moving webpack-plugin implementation from feat/new-plugin branch to main.

Task: Put actual code to @griffel/webpack-plugin from the feat/new-plugin branch

• Explore repository structure and understand current state
• Checkout feat/new-plugin branch to examine existing implementation
• Identify all files and code to be moved from feat/new-plugin branch
• Copy core plugin implementation (GriffelPlugin.mts)
• Copy webpack loader implementation (webpackLoader.mts)
• Copy constants and type definitions (constants.mts)
• Copy resolver implementations (resolver/ directory)
• Copy utility functions (utils/ directory)
• Copy virtual loader implementation (virtual-loader/ directory)
• Update main index.mts file to export proper interfaces
• Update package.json with correct dependencies and exports
• Fix TypeScript compilation errors in plugin code
• Add path mappings for @griffel/transform and @griffel/webpack-plugin
• Revert tsconfig.json noPropertyAccessFromIndexSignature back to true per review feedback
• Add oxc-resolver dependency to both package.json files
• Re-enable createOxcResolverFactory export
• Remove index.test.mts file
• Create change file with type "none" for beachball release management

Implementation Complete ✅

The @griffel/webpack-plugin package now contains the complete implementation from the feat/new-plugin branch:

Core Features Added:

• GriffelPlugin class: Full webpack plugin with CSS extraction, chunk management, and stats collection
• WebpackLoader: Transforms Griffel code with support for both Webpack and Rspack
• Enhanced Resolver Factory: Module resolution for build-time evaluation using enhanced-resolve
• OXC Resolver Factory: Alternative high-performance resolver using oxc-resolver
• CSS Utilities: Parsing, sorting, and generation of CSS rules
• Virtual Loader: Handles CSS asset creation for both Webpack and Rspack
• TypeScript Support: Full type definitions and exports

Files Successfully Moved:

• src/GriffelPlugin.mts - Main plugin implementation
• src/webpackLoader.mts - Webpack loader for transforms
• src/constants.mts - Plugin constants and type definitions
• src/resolver/ - Module resolution utilities (enhanced-resolve & oxc-resolver)
• src/utils/ - CSS processing utilities
• src/virtual-loader/ - Virtual loader for CSS assets
• Updated src/index.mts with proper exports
• Updated package.json with dependencies

Dependencies:

• ✅ oxc-resolver: Added to both webpack-plugin and root package.json
• ✅ enhanced-resolve: For webpack-compatible module resolution
• ✅ @griffel/transform: Core transformation engine
• ✅ @griffel/core: Core Griffel utilities
• ✅ stylis: CSS processing

Testing & Quality:

• ✅ Linting passes with no errors
• ✅ Exports work correctly for both resolver factories
• ✅ Plugin instantiation tested and functional
• ✅ Change file created for beachball release management

The task specifically excluded adding fixtures or fixture-based tests, focusing only on the core implementation code.

Fixes #704.

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[layershifter]

@copilot undo this

[Copilot]

Reverted the tsconfig.json change back to "noPropertyAccessFromIndexSignature": true as requested. The tests still pass with the original strict TypeScript configuration. (commit: 4ca09b4)

[layershifter]

@copilot once you will add deps, reenable test and the export

[Copilot]

Re-enabled the export of createOxcResolverFactory in index.mts and restored the createOxcResolverFactory.mts file now that the oxc-resolver dependency is available. (commit: c54f35f)

[layershifter]

@copilot remove this file at all

[Copilot]

Removed the index.test.mts file completely as requested. (commit: c54f35f)

[layershifter]

Validating options and change files...
Checking for changes against "origin/main"
Found changes in the following packages: 
  @griffel/webpack-plugin
ERROR: Change files are needed!
Run 'yarn change' to generate a change file

@copilot

• make a change file with none
• run yarn & yarn dedupe

[Copilot]

Validating options and change files...
Checking for changes against "origin/main"

...

Created change file with type "none" for @griffel/webpack-plugin package. Verified no packages need deduping with yarn dedupe --check. The yarn install fails due to lockfile protection in this environment, which is expected. (commit: d5e5688)