Add start of collection

packages/primitives/leptos/collection/Cargo.toml

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+[package]
+name = "radix-leptos-collection"
+description = "Leptos port of Radix Collection."
+
+authors.workspace = true
+edition.workspace = true
+license.workspace = true
+repository.workspace = true
+version.workspace = true
+
+[dependencies]
+leptos.workspace = true
+radix-leptos-compose-refs = { path = "../compose-refs", version = "0.0.1" }
+radix-leptos-primitive = { path = "../primitive", version = "0.0.1" }

packages/primitives/leptos/collection/README.md

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+<p align="center">
+    <a href="../../../../logo.svg" alt="Rust Radix logo">
+        <img src="../../../../logo.svg" width="300" height="200">
+    </a>
+</p>
+
+<h1 align="center">radix-leptos-roving-focus</h1>
+
+This is an internal utility, not intended for public usage.
+
+## Rust Radix
+
+[Rust Radix](https://github.com/NixySoftware/radix) is a Rust port of [Radix](https://www.radix-ui.com/primitives).

packages/primitives/leptos/collection/src/collection.rs

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+// TODO: remove
+#![allow(dead_code, unused_variables)]
+
+use std::collections::HashMap;
+
+use leptos::{
+    html::{AnyElement, ElementDescriptor},
+    *,
+};
+
+#[derive(Clone)]
+struct CollectionContextValue<ItemElement: ElementDescriptor + 'static, ItemData: 'static> {
+    collection_ref: NodeRef<AnyElement>,
+    item_map: RwSignal<HashMap<String, (NodeRef<ItemElement>, ItemData)>>,
+}
+
+#[component]
+pub fn CollectionProvider(children: ChildrenFn) -> impl IntoView {
+    // TODO: generics
+    let context_value = CollectionContextValue::<AnyElement, ()> {
+        collection_ref: create_node_ref(),
+        item_map: create_rw_signal(HashMap::new()),
+    };
+
+    view! {
+        <Provider value=context_value>
+            {children()}
+        </Provider>
+    }
+}

packages/primitives/leptos/collection/src/lib.rs

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+//! Leptos port of [Radix Collection](https://www.radix-ui.com/primitives).
+//!
+//! This is an internal utility, not intended for public usage.
+//!
+//! See [`@radix-ui/react-collection`](https://www.npmjs.com/package/@radix-ui/react-collection) for the original package.
+
+mod collection;
+
+pub use collection::*;