docs: fix stackflow() destructuring in remaining plugin docs

Remove useFlow from stackflow() destructuring in plugin-basic-ui, plugin-devtools,
plugin-google-analytics-4, plugin-renderer-basic, plugin-renderer-web, and
plugin-stack-depth-change docs (EN + KO). StackflowOutput only contains
{ Stack, actions, stepActions } in v2.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Author: tonyfromundefined

docs/pages/api-references/plugins/plugin-basic-ui.en.mdx

@@ -17,7 +17,7 @@ Provides components in the form of application app bars.
 import { stackflow } from "@stackflow/react";
 import { basicUIPlugin } from "@stackflow/plugin-basic-ui";
 
-const { Stack, useFlow } = stackflow({
+const { Stack } = stackflow({
   // ...
   plugins: [
     // ...

docs/pages/api-references/plugins/plugin-basic-ui.ko.mdx

@@ -17,7 +17,7 @@ npm install @stackflow/plugin-basic-ui
 import { stackflow } from "@stackflow/react";
 import { basicUIPlugin } from "@stackflow/plugin-basic-ui";
 
-const { Stack, useFlow } = stackflow({
+const { Stack } = stackflow({
   // ...
   plugins: [
     // ...

docs/pages/api-references/plugins/plugin-devtools.en.mdx

@@ -15,7 +15,7 @@ To utilize the plugin, integrate it within your Stackflow setup as shown:
 import { stackflow } from "@stackflow/react";
 import { devtoolsPlugin } from "@stackflow/plugin-devtools";
 
-const { Stack, useFlow } = stackflow({
+const { Stack } = stackflow({
   activities: {
     // ...
   },

docs/pages/api-references/plugins/plugin-devtools.ko.mdx

@@ -14,7 +14,7 @@ npm install @stackflow/plugin-devtools
 import { stackflow } from "@stackflow/react";
 import { devtoolsPlugin } from "@stackflow/plugin-devtools";
 
-const { Stack, useFlow } = stackflow({
+const { Stack } = stackflow({
   activities: {
     // ...
   },

docs/pages/api-references/plugins/plugin-google-analytics-4.en.mdx

@@ -17,7 +17,7 @@ npm install @stackflow/plugin-google-analytics-4
 import { stackflow } from "@stackflow/react";
 import { googleAnalyticsPlugin } from "@stackflow/plugin-google-analytics-4";
 
-const { Stack, useFlow } = stackflow({
+const { Stack } = stackflow({
   activities: {
     // ...
   },

docs/pages/api-references/plugins/plugin-google-analytics-4.ko.mdx

@@ -17,7 +17,7 @@ npm install @stackflow/plugin-google-analytics-4
 import { stackflow } from "@stackflow/react";
 import { googleAnalyticsPlugin } from "@stackflow/plugin-google-analytics-4";
 
-const { Stack, useFlow } = stackflow({
+const { Stack } = stackflow({
   activities: {
     // ...
   },

docs/pages/api-references/plugins/plugin-renderer-basic.en.mdx

@@ -14,7 +14,7 @@ npm install @stackflow/plugin-renderer-basic
 import { stackflow } from "@stackflow/react";
 import { basicRendererPlugin } from "@stackflow/plugin-renderer-basic";
 
-const { Stack, useFlow } = stackflow({
+const { Stack } = stackflow({
   activities: {
     // ...
   },

docs/pages/api-references/plugins/plugin-renderer-basic.ko.mdx

@@ -14,7 +14,7 @@ npm install @stackflow/plugin-renderer-basic
 import { stackflow } from "@stackflow/react";
 import { basicRendererPlugin } from "@stackflow/plugin-renderer-basic";
 
-const { Stack, useFlow } = stackflow({
+const { Stack } = stackflow({
   activities: {
     // ...
   },

docs/pages/api-references/plugins/plugin-renderer-web.en.mdx

@@ -14,7 +14,7 @@ npm install @stackflow/plugin-renderer-web
 import { stackflow } from "@stackflow/react";
 import { webRendererPlugin } from "@stackflow/plugin-renderer-web";
 
-const { Stack, useFlow } = stackflow({
+const { Stack } = stackflow({
   activities: {
     // ...
   },

docs/pages/api-references/plugins/plugin-renderer-web.ko.mdx

@@ -14,7 +14,7 @@ npm install @stackflow/plugin-renderer-web
 import { stackflow } from "@stackflow/react";
 import { webRendererPlugin } from "@stackflow/plugin-renderer-web";
 
-const { Stack, useFlow } = stackflow({
+const { Stack } = stackflow({
   activities: {
     // ...
   },