dwk601: migrate from react to solidjs v2

[dwk601]

This pull request migrates the project from React to SolidJS, introducing significant changes to dependencies, components, and state management. The migration improves performance and simplifies reactivity by leveraging SolidJS's fine-grained reactivity model. Below is a summary of the most important changes grouped by theme.

Dependency Updates:

• Replaced React-related dependencies (react, react-dom, @types/react, @types/react-dom, @testing-library/react, @vitejs/plugin-react) with SolidJS equivalents (solid-js, @solidjs/testing-library, vite-plugin-solid). ([[1]](https://github.com/commaai/flash/pull/158/files#diff-7ae45ad102eab3b6d7e7896acd08c427a9b25b346470d7bc6507b6481575d519L19-R31), [[2]](https://github.com/commaai/flash/pull/158/files#diff-58e6f63d87181b1c6a8cb6e5f1691df04aa32854456efcd52ca71c8541375d26L2-R6))

Component Migration:

• Updated src/app/App.test.jsx to use SolidJS's Suspense and testing library, replacing React's JSX syntax with SolidJS's function-based syntax. ([src/app/App.test.jsxL1-R8](https://github.com/commaai/flash/pull/158/files#diff-18b239fda5f974720b36f7ddf26ad0c959231930566b5304afecde9cc066790cL1-R8))
• Migrated src/app/index.jsx and src/main.jsx to SolidJS, replacing React's ReactDOM.createRoot with SolidJS's render function and adding a development environment check for the root element. ([[1]](https://github.com/commaai/flash/pull/158/files#diff-5f8d22049fec5561962e53e43d834657f76af599fac66de962b2bfa10d251d4cL1-R1), [[2]](https://github.com/commaai/flash/pull/158/files#diff-752aae33033979082689dba3e7f51955013615f0535c21ac94265e067da311edL1-R18))

State Management:

• Refactored state in src/app/Flash.jsx from React's useState and useRef to SolidJS's createSignal, onMount, and onCleanup, ensuring state updates are reactive and scoped. ([[1]](https://github.com/commaai/flash/pull/158/files#diff-2f137e0d23b8115a30a10a4f9d67a736b048c2eb5b9029787834afa10888642bL1-R1), [[2]](https://github.com/commaai/flash/pull/158/files#diff-2f137e0d23b8115a30a10a4f9d67a736b048c2eb5b9029787834afa10888642bL175-R192), [[3]](https://github.com/commaai/flash/pull/158/files#diff-2f137e0d23b8115a30a10a4f9d67a736b048c2eb5b9029787834afa10888642bL202-R286))
• Adjusted conditional rendering and event listeners in Flash.jsx to align with SolidJS's reactive primitives. ([src/app/Flash.jsxL202-R286](https://github.com/commaai/flash/pull/158/files#diff-2f137e0d23b8115a30a10a4f9d67a736b048c2eb5b9029787834afa10888642bL202-R286))

Utility Updates:

• Updated src/utils/image.js to replace React's useEffect and useRef with SolidJS's onMount and a plain object for managing the ImageManager reference. ([[1]](https://github.com/commaai/flash/pull/158/files#diff-c81787bf9bb6cd057667d950d2dc18cf721a556a19a51d19d0011ae1502c3553L1-R1), [[2]](https://github.com/commaai/flash/pull/158/files#diff-c81787bf9bb6cd057667d950d2dc18cf721a556a19a51d19d0011ae1502c3553L86-R93))

Build Tool Configuration:

• Replaced the Vite plugin for React with the SolidJS plugin in vite.config.js. ([vite.config.jsL2-R6](https://github.com/commaai/flash/pull/158/files#diff-58e6f63d87181b1c6a8cb6e5f1691df04aa32854456efcd52ca71c8541375d26L2-R6))