refactor: remove demo application and related assets

- Deleted the demo application located in apps/demo, including main.tsx, styles.css, and vite.config.ts.
- Removed associated assets such as reveal.jpeg.
- Updated nginx configuration to handle effects routing.
- Cleaned up package.json by removing Playwright dependencies and demo scripts.
- Adjusted pnpm workspace configuration to exclude apps from the workspace.
- Removed visual testing configurations and related test files.
- Updated TypeScript configuration to reflect the removal of the demo app.

Author: snwolak

.changeset/ten-kiwis-march.md

@@ -0,0 +1,7 @@
+---
+"@protohiro/effects": patch
+---
+
+Expand peer dependency compatibility to support React 19 and React DOM 19.
+
+This removes installation conflicts in apps using React 19 while keeping React 18 support.

.dockerignore

@@ -5,7 +5,6 @@ node_modules
 dist
 **/dist
 coverage
-playwright-report
 test-results
 .pnpm-store
 .DS_Store

.github/workflows/ci.yml

@@ -20,5 +20,3 @@ jobs:
       - run: pnpm typecheck
       - run: pnpm test
       - run: pnpm build
-      - run: pnpm exec playwright install --with-deps
-      - run: pnpm test:visual

.gitignore

@@ -1,9 +1,6 @@
 node_modules
 dist
 coverage
-.vite
-.playwright
-playwright-report
 test-results
 *.tsbuildinfo
 .DS_Store

CONTRIBUTING.md

@@ -9,8 +9,8 @@ Use `codex/<lane>-<task>` branch names.
 Keep PRs single-lane:
 - infra/core
 - single effect
-- tests/visuals
-- docs/demo
+- tests
+- docs
 
 ## Definition of done
 
@@ -26,6 +26,6 @@ Every PR must include:
 1. infra
 2. core runtime
 3. effects
-4. visual tests
-5. docs/demo
+4. tests
+5. docs
 6. release

Dockerfile.demo

@@ -4,15 +4,10 @@ Protohiro Effects is a zero-wrapper React library for hard CSS effects on existi
 
 Built for design systems and app UIs that need premium effects without extra DOM nodes, layout shifts, or runtime layout measurements.
 
-## Live demo
-
-[libs.protohiro.com/effects](https://libs.protohiro.com/effects/)
-
 ## Packages
 
 - `@protohiro/effects-core`: shared runtime utilities.
 - `@protohiro/effects`: React hooks and effect styles.
-- `@protohiro/effects-demo`: local demo app.
 
 ## Quick start
 
@@ -144,6 +139,5 @@ Hooks are composable because each effect writes only namespaced classes (`pe-*`)
 pnpm lint
 pnpm typecheck
 pnpm test
-pnpm test:visual
 pnpm size
 ```