FCE-2840 Add livestream integration tests

[czerwiukk]

Description

Runs simple livestream test using playwright.

Motivation and Context

We lacked some automatic livestream testing.

Documentation impact

• Documentation update required
• Documentation updated in another PR
• No documentation update required

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to
  not work as expected)

[linear]

FCE-2840 Add broadcaster integration tests

[Copilot]

Pull request overview

Adds a new Playwright-based E2E test app to exercise WHIP/WHEP livestream flows, and exposes WebRTC stats from the SDK to support “video is playing” assertions.

Changes:

• Introduces a new @fishjam-e2e/livestream-client workspace (Vite + React) with Playwright scenarios for basic livestream publish/receive flows.
• Extends ts-client livestream helpers and the react-client viewer hook with a getStatistics() API (used by the E2E assertions).
• Applies formatting-only cleanups across the mobile example and Expo config plugins.

Reviewed changes

Copilot reviewed 32 out of 34 changed files in this pull request and generated 9 comments.

Show a summary per file

File	Description
yarn.lock	Adds the new e2e workspace entry and pins prettier.
packages/ts-client/src/livestream.ts	Adds getStatistics() to publish/receive results by delegating to RTCPeerConnection.getStats().
packages/react-client/src/hooks/useLivestreamViewer.ts	Exposes viewer getStatistics() for consumers (used by Playwright).
package.json	Registers e2e-tests/livestream-client as a Yarn workspace.
examples/mobile-client/fishjam-chat/utils/fishjamIdStore.ts	Removes trailing whitespace (format-only).
examples/mobile-client/fishjam-chat/tsconfig.json	JSON formatting (single-line arrays).
examples/mobile-client/fishjam-chat/eslint.config.js	Formatting / quote normalization.
examples/mobile-client/fishjam-chat/components/VideosGrid.tsx	Formatting (commas/array formatting).
examples/mobile-client/fishjam-chat/components/NoCameraView.tsx	Removes trailing whitespace (format-only).
examples/mobile-client/fishjam-chat/components/InCallButton.tsx	Removes trailing whitespace (format-only).
examples/mobile-client/fishjam-chat/app/livestream/screen-sharing.tsx	Formatting (comma in console.error args).
examples/mobile-client/fishjam-chat/app/_layout.tsx	Formatting (expanded options objects).
examples/mobile-client/fishjam-chat/app/(tabs)/room.tsx	Formatting + minor style cleanup in JSX/strings.
examples/mobile-client/fishjam-chat/README.md	Formatting (blank lines before code fences).
examples/mobile-client/common/plugins/src/withLocalWebrtcPaths.ts	Formatting (commas and console.log arg style).
examples/mobile-client/common/plugins/src/withLocalWebrtcIos.ts	Formatting (quotes, line breaks).
examples/mobile-client/common/plugins/src/withLocalWebrtcAndroid.ts	Formatting (quotes, line breaks).
examples/mobile-client/common/plugins/src/utils.ts	Formatting (trailing comma).
e2e-tests/livestream-client/vite.config.ts	Vite config for the new e2e app.
e2e-tests/livestream-client/tsconfig.node.json	TS config for Node-side config files (Vite/Playwright/config).
e2e-tests/livestream-client/tsconfig.json	TS config for app source build output.
e2e-tests/livestream-client/src/vite-env.d.ts	Declares Vite env types for the app.
e2e-tests/livestream-client/src/main.tsx	React entry point wiring FishjamProvider + app.
e2e-tests/livestream-client/src/canvasStream.ts	Creates/stops a canvas-based MediaStream (CI-friendly fake video).
e2e-tests/livestream-client/src/App.tsx	UI to publish/receive via sandbox helpers; exposes viewer on window for stats polling.
e2e-tests/livestream-client/scenarios/utils.ts	Playwright helpers for start/stop and “video playing” assertions via stats.
e2e-tests/livestream-client/scenarios/basic.spec.ts	Adds basic livestream publish/receive/reconnect test scenarios.
e2e-tests/livestream-client/scenarios/.gitkeep	Placeholder file in scenarios directory.
e2e-tests/livestream-client/playwright.config.ts	Playwright setup with dev server and chromium config.
e2e-tests/livestream-client/package.json	New workspace package definition and scripts.
e2e-tests/livestream-client/index.html	HTML entry for Vite.
e2e-tests/livestream-client/config.ts	Provides fishjam endpoint default/env wiring for the app.
e2e-tests/livestream-client/README.md	Documents the new e2e app (currently out of sync with implementation).
e2e-tests/livestream-client/.gitignore	Ignores build artifacts and Playwright outputs.

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