docs: Update CONTRIBUTING.md with Rust setup and turbo build info. (#741)

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## Summary

<!-- Can you explain the reasoning behind implementing this change? What
problem or issue does this pull request resolve? -->

This pull request updates `CONTRIBUTING.md` to address setup and build
issues encountered by new contributors, resolving the problems
documented in issue #710.

**Problem:** Following the previous instructions in `CONTRIBUTING.md`
(`pnpm install` -> `pnpm build` -> `pnpm test`) leads to test failures,
specifically the `Could not resolve "./dist/vitest.config"` error.

**Reasoning & Root Causes:**
1. **Missing Prerequisite:** The project requires a specific Rust
toolchain version, **`1.81.0`**, as defined in the `rust-toolchain` file
at the root, along with the `wasm32-unknown-unknown` target for
compiling native code (WASM/NAPI). This requirement was not documented,
causing build failures during the Rust compilation steps for users who
only had a different version (like the latest stable `1.86.0`)
installed.
2. **Incomplete Build Command:** The documented `pnpm build` command
(which is an alias for `tsc --build`) only performs TypeScript
compilation. It does *not* handle the necessary Rust compilation steps
or other package-specific build scripts (like `rslib build` used by
`@lynx-js/reactlynx-testing-library`) required to generate all artifacts
needed for testing, including the missing `dist/vitest.config.js`.
3. **Correct Build Process:** The full project build needs to be
orchestrated by Turborepo using the command `pnpm exec turbo run build`.
This ensures all dependencies (including Rust components) are built in
the correct order before dependent packages attempt to use them.

**Solution Implemented in this PR:**
* The `CONTRIBUTING.md` file has been updated to:
* Clearly list Rust `1.81.0` and the `wasm32-unknown-unknown` target as
prerequisites, including the `rustup` command needed to install them.
* Revise the "Building" section to emphasize that `pnpm exec turbo run
build` is the required command for a complete build that must be run
before `pnpm test`.
* Clarify the limited scope of the root `pnpm build` (`tsc --build`)
command.

These documentation changes will help future contributors set up their
environment correctly and avoid the build/test failures initially
reported.

<!-- It would be helpful if you could provide any relevant context, such
as GitHub issues or related discussions. -->

close: #710

## Checklist

<!--- Check and mark with an "x" -->

- [ ] Tests updated (or not required). **NOT REQUIRED**
- [x] Documentation updated (or not required). **CONTRIBUTING.md
UPDATED**

cspell.jsonc: "rustup" added to **words**
---------

Signed-off-by: Chthonic <devchthonic@protonmail.com>
Signed-off-by: Qingyu Wang <40660121+colinaaa@users.noreply.github.com>
Co-authored-by: Qingyu Wang <40660121+colinaaa@users.noreply.github.com>

Author: DevChthonic

CONTRIBUTING.md

@@ -8,6 +8,15 @@ _Node_: Check that Node is [installed](https://nodejs.org/en/download/) with ver
 
 _pnpm_: Make sure that pnpm is available. You can use `corepack enable` to automatically setup pnpm.
 
+_Rust_: ReactLynx utilizes SWC plugins, necessitating the Rust toolchain for building.
+
+- Ensure you have [`rustup`](https://rustup.rs/) installed.
+- Install the required WASM target by running the following command (you only need to do this once):
+  ```sh
+  rustup target add wasm32-unknown-unknown
+  ```
+- `rustup` will automatically use the correct toolchain when you run build commands inside this project, thanks to the `rust-toolchain` file.
+
 ### Setup
 
 To setup the project, run:
@@ -18,31 +27,17 @@ pnpm install
 
 ### Building
 
-To build the projects, run:
-
-```sh
-pnpm build # An alias for `tsc --build`
-```
-
-The project is managed using TypeScript's [Project Reference](https://www.typescriptlang.org/docs/handbook/project-references.html#handbook-content).
-
-So running `tsc --build` at the repository root can build all projects.
-
-Also, the repository can also be built with [`turborepo`]. Running:
-
-```sh
-pnpm turbo build
-```
-
-will built all the projects and it's dependencies recursively with cache enabled.
+**Full Build (Required for Tests)**
 
-#### Build with Watching
+    ```sh
+    pnpm turbo build
+    ```
 
-To build the projects and incrementally build files on change, run:
+**Build with Watching (TypeScript Only)**
 
-```sh
-pnpm build --watch
-```
+    ```sh
+    pnpm turbo watch build
+    ```
 
 ### Running linting/tests
 
@@ -142,6 +137,19 @@ You should always commit the change to git.
 
 ## Submitting
 
+### Code Formatting
+
+#### dprint
+
+We use [dprint](https://dprint.dev/install/) for automatic code formatting to maintain a consistent style.
+Please ensure your code is formatted prior to submitting.
+
+Just run:
+
+```sh
+pnpm dprint fmt
+```
+
 ### Generating changesets
 
 We use [🦋 Changesets](https://github.com/changesets/changesets?tab=readme-ov-file) to manage versioning and changelogs.

cspell.jsonc

@@ -136,6 +136,7 @@
     "lhci",
     "lh",
     "queueMicrotask",
+    "rustup", // Rust installer/manager
   ],
   // Glob
   "ignorePaths": [