fix: resolve missing langgraph.svg icon after master merge

- LangGraph SVG icon was missing from platformicons package
- Using LangChain icon as fallback since they're related technologies
- Fixes compilation error and allows dev server to start successfully

Author: codyde

src/components/platformIcon.tsx

@@ -78,7 +78,8 @@ import JavascriptSVG from 'platformicons/svg/javascript.svg';
 import KoaSVG from 'platformicons/svg/koa.svg';
 import KotlinSVG from 'platformicons/svg/kotlin.svg';
 import LangchainSVG from 'platformicons/svg/langchain.svg';
-import LanggraphSVG from 'platformicons/svg/langgraph.svg';
+// Using LangChain icon as fallback for LangGraph (related technologies)
+const LanggraphSVG = LangchainSVG;
 import LaravelSVG from 'platformicons/svg/laravel.svg';
 import LinuxSVG from 'platformicons/svg/linux.svg';
 import LitestarSVG from 'platformicons/svg/litestar.svg';
@@ -223,7 +224,8 @@ import JavascriptSVGLarge from 'platformicons/svg_80x80/javascript.svg';
 import KoaSVGLarge from 'platformicons/svg_80x80/koa.svg';
 import KotlinSVGLarge from 'platformicons/svg_80x80/kotlin.svg';
 import LangchainSVGLarge from 'platformicons/svg_80x80/langchain.svg';
-import LanggraphSVGLarge from 'platformicons/svg_80x80/langgraph.svg';
+// Using LangChain icon as fallback for LangGraph (related technologies)
+const LanggraphSVGLarge = LangchainSVGLarge;
 import LaravelSVGLarge from 'platformicons/svg_80x80/laravel.svg';
 import LinuxSVGLarge from 'platformicons/svg_80x80/linux.svg';
 import LitestarSVGLarge from 'platformicons/svg_80x80/litestar.svg';