Rewrite event-to-object package

[Archmonger]

Description

• fix Rewrite event_to_object package #1196
• A follow up PR will be required for Serialize File Content #574

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 completely rewrites the event-to-object JavaScript package to be more robust at handling event properties and DOM serialization. The rewrite moves from a type-specific approach to a generic recursive object conversion approach.

Key changes:

• Complete rewrite of event-to-object package with generic object-to-JSON conversion
• Migration from uvu to vitest/bun:test testing framework
• Addition of comprehensive tests for recursion handling, file inputs, and DOM properties
• Python code cleanup (alphabetical slot ordering, hash implementation fixes)
• CI/configuration improvements (test environment setup, JavaScript test re-enabling)

Reviewed changes

Copilot reviewed 20 out of 21 changed files in this pull request and generated 7 comments.

Show a summary per file

File	Description
src/js/packages/event-to-object/src/index.ts	Complete rewrite with generic recursive conversion logic, cycle detection, and depth limiting
src/js/packages/event-to-object/tests/*.ts	New comprehensive test suite with vitest, including recursion, file inputs, and DOM property tests
src/js/packages/event-to-object/package.json	Version bump to 1.0.0, author change, dependency updates (vitest, happy-dom 15.0.0)
src/js/packages/event-to-object/vitest.config.ts	New vitest configuration for test environment
tests/conftest.py	Fix for nested Hatch environment issue with HATCH_ENV_ACTIVE
src/reactpy/utils.py	Added __hash__ = None to Ref class for proper hashability
src/reactpy/core/events.py	Added __hash__ = None to EventHandler, refactored eq method
src/reactpy/core/hooks.py	Alphabetically ordered slots in _CurrentState and _Memo
src/reactpy/core/component.py	Alphabetically ordered slots in Component
src/reactpy/web/utils.py	Removed unused version variable assignment
pyproject.toml	Changed test dependencies to use features, simplified JS test command, added PLC0415 lint ignore
.github/workflows/check.yml	Re-enabled JavaScript tests (removed temporary disable)
.github/workflows/.hatch-run.yml	Removed uv from pip install dependencies
docs/source/about/changelog.rst	Added changelog entry for the rewrite
src/js/bun.lockb	Updated lockfile with new dependencies