test: add playwright suite.

[knightedcodemonkey]

No description provided.

[Copilot]

Pull request overview

Adds an end-to-end (E2E) test setup using Playwright for the browser-based playground, along with supporting TypeScript + ESLint configuration and CI automation.

Changes:

• Introduces a Playwright E2E spec covering key playground behaviors (rendering, mode/style switches, dialogs, persistence).
• Adds Playwright configuration + CI workflow to run tests (Chromium locally; Chromium + WebKit on CI).
• Adds TS config/type-check script and an ESLint flat config for Playwright files.

Reviewed changes

Copilot reviewed 6 out of 9 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
tsconfig.json	TypeScript config scoped to Playwright tests/config for check-types.
playwright/app.spec.ts	New Playwright E2E suite for the playground UI flows.
playwright.config.ts	Playwright runner config including webServer boot + CI project matrix.
package.json	Adds Playwright/ESLint/TS dev deps and scripts for typecheck/lint/e2e.
package-lock.json	Lockfile updates for newly added tooling dependencies.
eslint.config.js	Flat ESLint config to lint Playwright tests with eslint-plugin-playwright.
README.md	Documents how to run the new E2E suite locally.
.gitignore	Ignores Playwright outputs (playwright-report, test-results).
.github/workflows/playwright.yml	New GitHub Actions workflow to run Playwright in CI.

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[Copilot]

Pull request overview

Adds a Playwright-based end-to-end test suite for the browser playground, along with TypeScript and ESLint wiring plus CI automation to run the suite.

Changes:

• Introduces a Playwright E2E spec covering core playground behaviors (rendering, modes, theme/layout, clear actions).
• Adds Playwright/TypeScript/ESLint tooling and scripts (typecheck, lint, e2e commands) plus Playwright config + web server setup.
• Adds a dedicated GitHub Actions workflow for Playwright and documents local setup in the README.

Reviewed changes

Copilot reviewed 7 out of 10 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
tsconfig.json	Adds TS project config for Playwright tests/config typechecking.
playwright/app.spec.ts	New Playwright E2E coverage for key UI flows.
playwright.config.ts	Configures Playwright projects, baseURL, and local webServer.
eslint.config.js	Adds ESLint flat config targeting Playwright files with Playwright plugin rules.
package.json	Adds scripts and devDependencies for Playwright, ESLint, and TypeScript.
package-lock.json	Locks newly added tooling dependencies.
README.md	Documents Playwright browser installation and how to run E2E tests.
.gitignore	Ignores Playwright reports/results.
.github/workflows/playwright.yml	Adds CI job to run Playwright tests on main/manual.
.github/workflows/deploy.yml	Changes deploy trigger behavior (push trigger removed).

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