Switch from react to preact

[Archmonger]

Description

Removes usage of react from the reactpy-django client and utilize preact instead.

This also required doing some overrides to force @reactpy/client to utilize preact.

Checklist

Please update this checklist as you complete each item:

• Tests have been developed for bug fixes or new functionality.
• The changelog has been updated, if necessary.
• Documentation has been updated, if necessary.
• GitHub Issues closed by this PR have been linked.

_{By submitting this pull request I agree that all contributions comply with this project's open source license(s).}

[Copilot]

Pull Request Overview

This PR replaces React with Preact in the ReactPy-Django client, updates build and dependency configurations, and adjusts related code and tests for Preact compatibility.

• Configure TypeScript and package aliases so “react” and “react-dom” resolve to Preact/compat
• Refactor mounting and component utilities to use Preact’s render, createElement, and hooks
• Update test utilities to simplify console logging and ignore print statements via ruff

Reviewed Changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
tests/test_app/tests/utils.py	Removed custom logging helper, replaced with inline print for Playwright console events
src/js/tsconfig.json	New TS config enabling Preact JSX, path aliases for React imports
src/js/src/mount.tsx	Swapped out ReactDOM.render for preact.render, added guard for missing mount element
src/js/src/components.ts	Replaced React imports with Preact equivalents in bind, DjangoForm, and HttpRequest
src/js/src/client.ts	Switched ReactPyClient/ReactPyModule imports to type-only
src/js/package.json	Added preact and aliased react/react-dom to Preact, updated dev dependencies

Comments suppressed due to low confidence (2)

src/js/package.json:9

• [nitpick] Since the codebase now uses Preact instead of React, consider removing eslint-plugin-react or switching to a Preact-compatible ESLint plugin to avoid false lint errors.

"eslint-plugin-react": "^7.37.1", 

src/js/tsconfig.json:14

• The compiler option module: "Preserve" is not a valid module target in TypeScript. Consider using a supported value such as "ESNext" or your desired module format.

"module": "Preserve",