refactor: upgrade ESLint 9→10 and simplify React lint toolchain

- Upgrade eslint and @eslint/js to v10
- Replace eslint-plugin-react-x + eslint-plugin-react-dom + eslint-plugin-react-hooks
  with unified @eslint-react/eslint-plugin
- Raise dev Node.js requirement to ^22.13.0 || >=24 (runtime packages unaffected)
- Add .npmrc with engine-strict=true
- Move all @eslint-react rule overrides to eslint.config.js,
  eliminating plugin-specific inline eslint-disable comments
- Fix real issues caught by new rules: useless assignments,
  leaked setTimeout, ref naming, useState setter naming

packages/website/src/pages/home/HeroSection.tsx

@@ -1,4 +1,3 @@
-/* eslint-disable react-dom/no-dangerously-set-innerhtml */
 import type { PageAgent as PageAgentType } from 'page-agent'
 import { useEffect, useState } from 'react'
 import { Link, useSearchParams } from 'wouter'
@@ -46,10 +45,11 @@ export default function HeroSection() {
 		: 'Goto docs in navigation bar, find Quick-Start section, and summarize in markdown'
 
 	const [task, setTask] = useState(() => defaultTask)
-
-	useEffect(() => {
+	const [prevDefaultTask, setPrevDefaultTask] = useState(defaultTask)
+	if (prevDefaultTask !== defaultTask) {
+		setPrevDefaultTask(defaultTask)
 		setTask(defaultTask)
-	}, [defaultTask])
+	}
 
 	const [params] = useSearchParams()
 	const isOther = params.has('try_other')