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/extension/src/components/ConfigPanel.tsx

@@ -49,7 +49,9 @@ export function ConfigPanel({ config, onSave, onClose }: ConfigPanelProps) {
 	const [showToken, setShowToken] = useState(false)
 	const [showApiKey, setShowApiKey] = useState(false)
 
-	useEffect(() => {
+	const [prevConfig, setPrevConfig] = useState(config)
+	if (prevConfig !== config) {
+		setPrevConfig(config)
 		setBaseURL(config?.baseURL || DEMO_BASE_URL)
 		setModel(config?.model || DEMO_MODEL)
 		setApiKey(config?.apiKey)
@@ -59,7 +61,7 @@ export function ConfigPanel({ config, onSave, onClose }: ConfigPanelProps) {
 		setExperimentalLlmsTxt(config?.experimentalLlmsTxt ?? false)
 		setExperimentalIncludeAllTabs(config?.experimentalIncludeAllTabs ?? false)
 		setDisableNamedToolChoice(config?.disableNamedToolChoice ?? false)
-	}, [config])
+	}
 
 	// Poll for user auth token every second until found
 	useEffect(() => {

packages/extension/src/components/HistoryDetail.tsx

@@ -71,7 +71,6 @@ export function HistoryDetail({
 			{/* Events (read-only) */}
 			<div className="flex-1 overflow-y-auto p-3 space-y-2">
 				{session.history.map((event, index) => (
-					// eslint-disable-next-line react-x/no-array-index-key
 					<EventCard key={index} event={event} />
 				))}
 			</div>

packages/extension/src/components/HistoryList.tsx

@@ -34,7 +34,6 @@ export function HistoryList({
 	}, [])
 
 	useEffect(() => {
-		// eslint-disable-next-line react-hooks/set-state-in-effect
 		load()
 	}, [load])