chore: [SDK-4197] migrate to Vite+ toolchain

[fadi-george]

Description

One Line Summary

Migrate the build, lint, and test toolchain from Bun + Jest + ESLint + Prettier to Vite+ (vp) which bundles Vitest, Oxlint, and Oxfmt.

Details

Motivation

Vite+ provides a unified toolchain that replaces multiple separate tools (Bun, Jest, ESLint, Prettier) with a single CLI (vp). This simplifies dependency management, reduces config files, and aligns with the direction of other OneSignal SDK wrappers.

Scope

• Build: vp pack replaces the previous build setup
• Tests: Vitest (via vp test) replaces Jest
• Linting: Oxlint (via vp check) replaces ESLint
• Formatting: Oxfmt (via vp fmt) replaces Prettier
• CI/CD: Updated to use shared wrapper-js-ci.yml with toolchain: vite-plus and publish-npm-github.yml with toolchain: vite-plus
• Demo app: Removed eslint, prettier, and jest config/dependencies (not needed for the example app)
• No changes to runtime behavior, public API, or native code

Testing

Unit testing

All existing tests migrated to Vitest and passing via vp test.

Manual testing

• Verified vp check (lint), vp test (tests), and vp pack (build) all pass locally
• Verified demo app builds and runs on both Android emulator and iOS simulator

Affected code checklist

• Notifications
• Outcomes
• Sessions
• In-App Messaging
• REST API requests
• Public API changes

Checklist

Overview

• I have filled out all REQUIRED sections above
• PR does one thing
• Any Public API changes are explained in the PR details and conform to existing APIs

Testing

• I have included test coverage for these changes, or explained why they are not needed
• All automated tests pass, or I explained why that is not possible
• I have personally tested this on my device, or explained why that is not possible

Final pass

• Code is as readable as possible.
• I have reviewed this PR myself, ensuring it meets each checklist item

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