Base64 fix and test cases refactor to use real browser

[imagekitio]

No description provided.

[Copilot]

Pull request overview

This PR fixes Unicode-safe Base64 encoding used in transformation overlays and refactors the test suite to run against the real built SDK in Chromium via Playwright (instead of Node + sinon/mocha). It also introduces release-please automation and updates CI/publishing workflows, alongside removing legacy tests and the old sample app.

Changes:

• Fix safeBtoa to correctly Base64-encode UTF-8 strings in browser environments (e.g., Hindi text overlays).
• Migrate URL-generation, responsive attributes, and upload tests from Node/mocha to Playwright using a browser-hosted test app.
• Add release automation (release-please) and update GitHub Actions workflows; remove legacy CI/test tooling and sample app.

Reviewed changes

Copilot reviewed 36 out of 40 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
test/url-generation/overlay.js	Removed legacy mocha/chai overlay URL-generation tests (migrated to Playwright).
test/url-generation/buildtransformationString.js	Removed legacy mocha/chai transformation-string unit tests (migrated to Playwright).
test/upload.js	Removed legacy sinon fake-XHR upload tests (migrated to Playwright network interception).
test/setup.js	Removed Node polyfill-based test setup no longer used after Playwright migration.
test/responsive.js	Removed legacy responsive attributes tests (migrated to Playwright).
test-app/tests/upload.spec.ts	New Playwright upload suite using real Chromium + route interception and multipart parsing.
test-app/tests/responsive.spec.ts	New Playwright suite for getResponsiveImageAttributes running against the built bundle.
test-app/tests/overlay.spec.ts	New Playwright suite covering overlay URL generation and encoding (incl. Unicode/base64 cases).
test-app/tests/fixtures.ts	Shared Playwright fixture that loads /test-app/index.html and waits for SDK globals.
test-app/tests/buildTransformationString.spec.ts	New Playwright tests for buildTransformationString.
test-app/tests/basic.spec.ts	Converted basic URL-generation tests from mocha/chai to Playwright.
test-app/server.mjs	Added a minimal static server for Playwright’s webServer to serve repo root/test app.
test-app/playwright.config.ts	Added Playwright configuration (Chromium project + webServer).
test-app/package.json	Added isolated test-app package to run Playwright tests and host the server.
test-app/package-lock.json	Lockfile for test-app Playwright dependencies.
test-app/index.html	Browser harness that imports the built ESM bundle and exposes SDK functions on window.
test-app/.gitignore	Ignores test-app node_modules and Playwright artifacts.
src/utils/transformation.ts	Updated safeBtoa to be UTF-8 safe in browsers and prefer Buffer when available.
src/url.ts	Treat ff like di for slash-to-@@ conversion (font family paths in overlays).
samples/sample-app/views/index.pug	Removed legacy sample app view.
samples/sample-app/server/server.js	Removed legacy sample app server.
samples/sample-app/sample.env	Removed sample env template.
samples/sample-app/package.json	Removed sample app package manifest.
samples/sample-app/index.js	Removed sample app entry point.
release-please-config.json	Added release-please configuration.
README.md	Removed Codecov badge (but other badges now need updating to match new CI/license).
package.json	Removed mocha/nyc/chai tooling, switched tests to Playwright, updated license metadata.
LICENSE	Added Apache-2.0 license text (license change).
babel-register.js	Removed Babel register helper no longer needed after mocha removal.
.release-please-manifest.json	Added release-please manifest pinning current version.
.nycrc.json	Removed nyc config (nyc no longer used).
.mocharc.json	Removed mocha config (mocha no longer used).
.gitignore	Simplified node_modules ignore patterns.
.github/workflows/sync-release-as.yml	Added workflow to sync Release-As based on release PR title edits.
.github/workflows/release-please.yml	Added workflow to run release-please on pushes to master.
.github/workflows/publish-npm.yml	Updated npm publish workflow (OIDC provenance publish, modern actions versions).
.github/workflows/nodejs.yml	Removed old Node CI workflow.
.github/workflows/ci.yml	Added new CI workflow building SDK and running Playwright tests.

Files not reviewed (1)

• test-app/package-lock.json: Language not supported

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