perf: optimize header comparison and improve state synchronization

- Replace JSON.stringify with fast-deep-equal for better performance
- Add missing dependency to useDebounce hook in ApiOptions
- Improve header state synchronization in OpenAICompatible component
- Use existing fast-deep-equal library for consistency across codebase

webview-ui/src/components/settings/ApiOptions.tsx

@@ -3,6 +3,7 @@ import { convertHeadersToObject } from "./utils/headers"
 import { useDebounce } from "react-use"
 import { VSCodeLink } from "@vscode/webview-ui-toolkit/react"
 import { ExternalLinkIcon } from "@radix-ui/react-icons"
+import isEqual from "fast-deep-equal"
 
 import {
 	type ProviderName,
@@ -116,7 +117,7 @@ const ApiOptions = ({
 	useEffect(() => {
 		const propHeaders = apiConfiguration?.openAiHeaders || {}
 
-		if (JSON.stringify(customHeaders) !== JSON.stringify(Object.entries(propHeaders))) {
+		if (!isEqual(customHeaders, Object.entries(propHeaders))) {
 			setCustomHeaders(Object.entries(propHeaders))
 		}
 	}, [apiConfiguration?.openAiHeaders, customHeaders])
@@ -131,7 +132,7 @@ const ApiOptions = ({
 			const newHeadersObject = convertHeadersToObject(customHeaders)
 
 			// Only update if the processed object is different from the current config.
-			if (JSON.stringify(currentConfigHeaders) !== JSON.stringify(newHeadersObject)) {
+			if (!isEqual(currentConfigHeaders, newHeadersObject)) {
 				setApiConfigurationField("openAiHeaders", newHeadersObject)
 			}
 		},
@@ -213,6 +214,7 @@ const ApiOptions = ({
 			apiConfiguration?.lmStudioBaseUrl,
 			apiConfiguration?.litellmBaseUrl,
 			apiConfiguration?.litellmApiKey,
+			apiConfiguration?.openAiHeaders,
 			customHeaders,
 		],
 	)

webview-ui/src/components/settings/providers/OpenAICompatible.tsx

@@ -16,6 +16,7 @@ import { ExtensionMessage } from "@roo/ExtensionMessage"
 
 import { useAppTranslation } from "@src/i18n/TranslationContext"
 import { Button, StandardTooltip } from "@src/components/ui"
+import deepEqual from "fast-deep-equal"
 
 import { convertHeadersToObject } from "../utils/headers"
 import { inputEventTransform, noTransform } from "../transforms"
@@ -48,6 +49,12 @@ export const OpenAICompatible = ({
 		return Object.entries(headers)
 	})
 
+	// Sync local state with parent's headers when they change externally
+	useEffect(() => {
+		const headers = apiConfiguration?.openAiHeaders || {}
+		setCustomHeaders(Object.entries(headers))
+	}, [apiConfiguration?.openAiHeaders])
+
 	const handleAddCustomHeader = useCallback(() => {
 		// Only update the local state to show the new row in the UI.
 		setCustomHeaders((prev) => [...prev, ["", ""]])
@@ -91,7 +98,7 @@ export const OpenAICompatible = ({
 			const newHeadersObject = convertHeadersToObject(customHeaders)
 
 			// Only update if the processed object is different from the current config
-			if (JSON.stringify(currentConfigHeaders) !== JSON.stringify(newHeadersObject)) {
+			if (!deepEqual(currentConfigHeaders, newHeadersObject)) {
 				setApiConfigurationField("openAiHeaders", newHeadersObject)
 			}
 		}, 300)