build(frontend): migrate from Create React App to Vite

[eatyourgreens]

• add Vite packages and config.
• update build scripts.
• update ESLint config.
• update SVG shape imports.
• remove the old Express middleware proxy.
• clean up unused dependencies.
• update TypeScript.
• • towards #5.

[eatyourgreens]

Setting this to draft while I double check that the app still works with Vite.

[eatyourgreens]

Might be worth including the bump to TypeScript v5 in this PR too.