Add Effect v4 support, Fast Refresh tooling, and revamped docs (#56)

## Summary

- Add `effect-fc-next`, a React 19 integration targeting Effect v4 beta.
- Introduce component lifecycles, scoped resources, queries, mutations, forms, lenses, views, and refreshable components.
- Add `@effect-view/vite-plugin` for Vite Fast Refresh support.
- Add an Effect v4 example application covering the new APIs.
- Expand test coverage for both the existing and next-generation packages.
- Replace the starter Docusaurus content with complete Effect View documentation while preserving the Effect v3 docs as a versioned snapshot.
- Update the landing page, navigation, package scripts, and build output.
- Extend CI with linting, tests, package builds, Docker builds, and container publishing.

## Validation

- `bun lint:tsc`
- `bun lint:biome`
- `bun test`
- `bun run build`
- `bun pack`
- Docker image build

---------

Co-authored-by: Julien Valverdé <julien.valverde@mailo.com>
Reviewed-on: Thilawyn/effect-fc#56

packages/effect-fc/package.json

@@ -29,16 +29,20 @@
     ]
   },
   "scripts": {
-    "build": "tsc",
-    "lint:tsc": "tsc --noEmit",
+    "lint:tsc": "tsc -b --noEmit",
     "lint:biome": "biome lint",
+    "test": "vitest run",
+    "build": "tsc -b tsconfig.build.json",
     "pack": "npm pack",
-    "clean:cache": "rm -rf .turbo tsconfig.tsbuildinfo",
+    "clean:cache": "rm -rf .turbo *.tsbuildinfo",
     "clean:dist": "rm -rf dist",
     "clean:modules": "rm -rf node_modules"
   },
   "devDependencies": {
-    "@effect/platform-browser": "^0.76.0"
+    "@effect/platform-browser": "^0.76.0",
+    "@testing-library/react": "^16.3.0",
+    "jsdom": "^26.1.0",
+    "vitest": "^3.2.4"
   },
   "peerDependencies": {
     "@types/react": "^19.2.0",