chore: modernise with type declaration and removed eslint suppression

[iqrammm97]

Summary

Modernizes the package's CI and linting toolchain, adds public TypeScript declarations, and prepares the Vue 3-only v4 release.

What changed

• Added a CI workflow for linting, building the demo, and verifying the package contents.
• Modernized the CodeQL, PR-title, and npm publishing workflows with current runtimes, scoped permissions, concurrency controls, timeouts, pnpm caching, and npm provenance.
• Added index.d.ts declarations for the package's exported components, constants, utilities, currencies, timezones, and address configuration.
• Declared the package types entry point and bumped the package to 4.0.0.
• Standardized the package on Vue 3.5 and removed the @vue/compat peer dependency.
• Enabled the Vue 3 strongly recommended ESLint rules without warning-level suppressions and fixed the resulting violations.
• Upgraded ESLint to v10 and replaced eslint-plugin-import with eslint-plugin-import-x in both the package and demo configurations.
• Updated date formatting to the current date-fns/date-fns-tz APIs and tokens.
• Updated pnpm metadata, dependency lockfiles, and explicit dependency build-script policies for reproducible local and CI installs.

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