feat: add CLAUDE.md for development guidance and update .gitignore to include .claude directory; refactor AIChatPanel and AppShell components for improved context handling; simplify layout in ProjectDetail, NoteDetailPage, TasksPage, and TimelinePage components

src/renderer/components/projects/ProjectDetail.tsx

@@ -161,7 +161,7 @@ export function ProjectDetail({ projectId }: ProjectDetailProps) {
   }
 
   return (
-    <div className="p-6 pe-8 flex flex-col gap-6">
+    <div className="p-6 flex flex-col gap-6">
       {/* Breadcrumb + Project Name */}
       <div className="flex flex-col gap-1">
         {breadcrumbPath.length > 0 && (