Replace unicode_hack.js w/ regex uni chars, ship THIRD-PARTY-LICENSES.md at the package root

[damyanpetev]

Why

• igniteui-core/stringExtended.ts carried unicode_hack.js, a 2010-era polyfill that emulated \p{…} regex escapes with hand-generated Unicode 6.x character tables. Native property escapes have been in every supported engine since ES2018, and the tables were stale (hundreds of misclassified BMP code points per category, no astral coverage).
• The license manifest that feat: vite/ESM build, zero-hook initializer, public api.js module #404 introduced was written into wwwroot, so it was packed and served as a static web asset. It is package documentation, not something a page should fetch.

What changed

• The four character-class helpers (isLetter, isLetterOrDigit, isDigit, isNumber) are one-line /\p{…}/u tests; the tables, the translator, unicode_hack and netRegexToJS are deleted. The core chunk shrinks by about 11 KB gzip and the in-source legal notice is gone, so the npm test assertion that guarded it has nothing left to check.
• THIRD-PARTY-LICENSES.md moves to the NuGet package root next to LICENSE and README. Rolldown only emits inside outDir, so the vite build moves the file next to the csproj in closeBundle, and the csproj packs it when present. .gitignore covers it like wwwroot.

Verification

• npm run build, npm test, and the .NET suite pass.
• dotnet pack listing: the manifest is at the package root and absent from staticwebassets/.

🤖 Generated with Claude Code

[Copilot]

🟡 Changes recommended

The new unanchored regexes alter first-character classification behavior.

Once you've addressed the issues Copilot identified, you can request another Copilot review.

Pull request overview

Replaces the legacy Unicode implementation with native regex properties and packages dependency licenses at the NuGet package root.

Changes:

• Uses Unicode property escapes for character classification.
• Moves and packages the generated third-party license manifest.
• Updates static-asset validation and generated-file exclusions.

File summaries

File	Description
vite.config.mts	Moves the generated license manifest outside wwwroot.
tests/js/static-web-assets.test.mjs	Verifies the manifest’s new location.
src/src/ig/igniteui-core/stringExtended.ts	Replaces legacy Unicode tables with regexes.
src/IgniteUI.Blazor.Lite.csproj	Adds the manifest to the NuGet package root.
.gitignore	Ignores the generated manifest.

Review details

• Files reviewed: 4/5 changed files
• Comments generated: 1
• Review effort level: Balanced

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[Copilot]

🟢 Approval recommended

The Unicode modernization and packaging changes are consistent, complete, and covered by existing build validation.

Review details

• Files reviewed: 4/5 changed files
• Comments generated: 0 new
• Review effort level: Balanced