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-next/src/Refreshable.ts

@@ -0,0 +1,181 @@
+import type { Context, Scope } from "effect"
+import * as React from "react"
+import type * as Component from "./Component.js"
+
+
+/**
+ * A stable identifier used to associate an Effect View descriptor with its
+ * development refresh cell.
+ *
+ * This low-level API is intended for development-server integrations such as
+ * `@effect-view/vite-plugin`.
+ */
+export const RefreshableTypeId: unique symbol = Symbol.for("@effect-view/Refreshable/Refreshable")
+export type RefreshableTypeId = typeof RefreshableTypeId
+
+/**
+ * The version observed by a mounted Effect View refresh shell.
+ *
+ * `revision` changes for every update. `resetRevision` changes only when the
+ * adapter determines that preserving React state is unsafe.
+ */
+export interface Snapshot {
+    readonly revision: number
+    readonly resetRevision: number
+}
+
+/**
+ * A mutable development cell holding the latest version of an Effect View
+ * descriptor.
+ *
+ * This low-level API is intended for development-server integrations.
+ */
+export interface Cell {
+    current: Component.ComponentImpl.Any
+    signature: string
+    forceReset: boolean
+    snapshot: Snapshot
+    readonly subscribe: (listener: () => void) => () => void
+    readonly getSnapshot: () => Snapshot
+    readonly update: (
+        component: Component.Component.Any,
+        signature: string,
+        forceReset: boolean,
+    ) => void
+}
+
+export const RefreshablePrototype = Object.freeze({
+    asFunctionComponent<P extends {}, A extends React.ReactNode, E, R, F extends Component.Component.Signature>(
+        this: Component.ComponentImpl<P, A, E, R, F> & Refreshable,
+        contextRef: React.RefObject<Context.Context<Exclude<R, Scope.Scope>>>,
+    ) {
+        const cell = this[RefreshableTypeId]
+        let current = cell.current
+        let functionComponent = current.makeFunctionComponent(contextRef)
+
+        // Calling the current renderer inside this stable component deliberately
+        // keeps its hooks on the same fiber until resetRevision changes.
+        const Implementation = (props: P) => {
+            if (current !== cell.current) {
+                current = cell.current
+                functionComponent = current.makeFunctionComponent(contextRef)
+            }
+            return functionComponent(props)
+        }
+
+        const RefreshableComponent = (props: P) => {
+            const snapshot = React.useSyncExternalStore(
+                cell.subscribe,
+                cell.getSnapshot,
+                cell.getSnapshot,
+            )
+            return React.createElement(Implementation, {
+                ...props,
+                key: snapshot.resetRevision,
+            })
+        }
+
+        return RefreshableComponent as F
+    },
+} as const)
+
+export type RefreshablePrototype = typeof RefreshablePrototype
+
+/**
+ * A descriptor that can be connected to a development refresh cell.
+ */
+export interface Refreshable extends RefreshablePrototype {
+    readonly [RefreshableTypeId]: Cell
+}
+
+/**
+ * Checks whether a descriptor has been connected to a development refresh
+ * cell.
+ */
+export const isRefreshable = <A extends object>(
+    value: A,
+): value is A & Refreshable => Object.hasOwn(value, RefreshableTypeId)
+
+/**
+ * Creates a refresh cell for an Effect View descriptor.
+ *
+ * This low-level API is intended for development-server integrations.
+ */
+export const makeCell = (
+    component: Component.Component.Any,
+    signature: string,
+    forceReset: boolean,
+): Cell => {
+    const listeners = new Set<() => void>()
+    let notificationPending = false
+
+    const cell: Cell = {
+        current: component as Component.ComponentImpl.Any,
+        signature,
+        forceReset,
+        snapshot: {
+            revision: 0,
+            resetRevision: 0,
+        },
+        subscribe(listener) {
+            listeners.add(listener)
+            return () => {
+                listeners.delete(listener)
+            }
+        },
+        getSnapshot() {
+            return cell.snapshot
+        },
+        update(nextComponent, nextSignature, nextForceReset) {
+            const shouldReset = cell.forceReset
+                || nextForceReset
+                || cell.signature !== nextSignature
+
+            cell.current = nextComponent as Component.ComponentImpl.Any
+            cell.signature = nextSignature
+            cell.forceReset = nextForceReset
+            cell.snapshot = {
+                revision: cell.snapshot.revision + 1,
+                resetRevision: cell.snapshot.resetRevision + (shouldReset ? 1 : 0),
+            }
+
+            if (!notificationPending) {
+                notificationPending = true
+                queueMicrotask(() => {
+                    notificationPending = false
+                    for (const listener of listeners)
+                        listener()
+                })
+            }
+        },
+    }
+
+    return cell
+}
+
+/**
+ * Associates a descriptor with a refresh cell and returns the descriptor.
+ *
+ * This low-level API is intended for development-server integrations.
+ */
+export const attach = <A extends Component.Component.Any>(
+    component: A,
+    cell: Cell,
+): A & Refreshable => {
+    if (!isRefreshable(component)) {
+        Object.setPrototypeOf(
+            component,
+            Object.freeze(Object.setPrototypeOf(
+                Object.assign({}, RefreshablePrototype),
+                Object.getPrototypeOf(component),
+            )),
+        )
+    }
+
+    Object.defineProperty(component, RefreshableTypeId, {
+        configurable: true,
+        enumerable: true,
+        value: cell,
+    })
+    return component as A & Refreshable
+}