Footer: drop the duplicate build version, keep it in the header only

- Footer now shows just the storage path and active workers
- Version/env stays in the header status pill (spec updated to match)

frontend/src/components/StatusFooter.tsx

@@ -1,7 +1,6 @@
 import { Folder, Zap } from "lucide-react";
 
 import type { SystemStatus } from "@/lib/types";
-import { APP_VERSION } from "@/lib/version";
 
 export function StatusFooter({ status }: { status?: SystemStatus }) {
   return (
@@ -17,7 +16,7 @@ export function StatusFooter({ status }: { status?: SystemStatus }) {
         </span>
 
         <span
-          className="hidden shrink-0 items-center gap-1.5 md:flex"
+          className="ml-auto hidden shrink-0 items-center gap-1.5 md:flex"
           title="Active background jobs"
         >
           <Zap className="h-3 w-3" />
@@ -28,10 +27,6 @@ export function StatusFooter({ status }: { status?: SystemStatus }) {
               : "…"}
           </span>
         </span>
-
-        <span className="ml-auto shrink-0" title="Running build">
-          {status?.version ?? APP_VERSION}
-        </span>
       </div>
     </footer>
   );