Refactor: Transition to TypeScript and Webpack build system

[MaxymGorn]

Target

Open Questions

Checklist

• Tests cover new or modified code
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the site documentation
• I have made corresponding changes to the README, NuGet README file
• My changes generate no new warnings
• New dependencies added or updated
• Includes breaking changes
• Version bumped

Visuals

[Copilot]

Pull request overview

This PR refactors the build system from JavaScript with Excubo.WebCompiler to TypeScript with Webpack, bringing modern tooling, type safety, and comprehensive testing infrastructure to the project.

Changes:

• Migrated JavaScript codebase to TypeScript with strict type checking and namespace organization
• Replaced Excubo.WebCompiler with Webpack build system including source maps, code splitting, and TypeScript declaration generation
• Integrated Vitest for JavaScript/TypeScript testing, ESLint for linting, and Prettier for code formatting

Reviewed changes

Copilot reviewed 36 out of 42 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
webpack.config.js	New Webpack configuration with TypeScript compilation, CSS processing, and declaration file generation
package.json	npm dependencies for TypeScript tooling, testing (Vitest), linting (ESLint), and build tools
tsconfig.json	TypeScript configuration with strict mode and ES2020 target
Cropper/cropperJsInterop.ts	Main TypeScript file migrated from JS with type definitions and namespace organization
Cropper/helpers/*.ts	Helper utilities extracted into TypeScript modules with comprehensive type safety
Cropper/types/**/*.d.ts	TypeScript type definitions for .NET interop and Cropper.js integration
eslint.config.cjs	ESLint configuration for TypeScript (has critical bug)
vitest.config.ts	Vitest test configuration with coverage support
Cropper.Blazor.csproj	Updated build targets to integrate npm/Webpack into MSBuild process
.github/workflows/*.yml	CI/CD updates to run JavaScript tests and linting
cropperJsInterop.js	Removed original JavaScript implementation
cropper.min.js/css	Now copied from node_modules instead of being committed
excubowebcompiler.json	Removed old build configuration
.config/dotnet-tools.json	Removed Excubo.WebCompiler tool

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[codecov]

Codecov Report

❌ Patch coverage is 10.55276% with 178 lines in your changes missing coverage. Please review.
✅ Project coverage is 81.02%. Comparing base (bf6a9a5) to head (3ad4d86).
⚠️ Report is 1 commits behind head on dev.

Files with missing lines	Patch %	Lines
....Blazor/Cropper.Blazor/Cropper/cropperJsInterop.ts	1.48%	132 Missing and 1 partial ⚠️
...azor/Cropper.Blazor/Cropper/helpers/blob-helper.ts	4.25%	45 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               dev     #449       +/-   ##
============================================
- Coverage   100.00%   81.02%   -18.98%     
============================================
  Files           26       29        +3     
  Lines          739      938      +199     
  Branches        44       65       +21     
============================================
+ Hits           739      760       +21     
- Misses           0      177      +177     
- Partials         0        1        +1     

Flag	Coverage Δ
DotNet	100.00% <100.00%> (ø)
TypeScript	6.31% <6.31%> (?)

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