feat(toolrate): rebrand to toolr + logo links home

- visible brand text changed to toolr (sidebar, mobile header, topbar
  fallback, login, 404, home heading, index.html title/og/twitter meta)
- brand logo now links to / in sidebar, mobile header, login, 404
- internal identifiers unchanged: package name, localStorage key

artifacts/toolrate/src/pages/home.tsx

@@ -21,7 +21,7 @@ export default function Home() {
     <Layout>
       <div className="space-y-8 pb-8">
         <div>
-          <h1 className="text-3xl font-bold tracking-tight mb-2">Welcome to ToolRate</h1>
+          <h1 className="text-3xl font-bold tracking-tight mb-2">Welcome to toolr</h1>
           <p className="text-muted-foreground">The community hub where engineers honestly rate the tools they use daily.</p>
         </div>