Remove header and footer border separators (#102)

Remove border-b from TopBar and border-t from StatusBar for a cleaner,
borderless look between the header, content, and footer areas.

ui/goose2/src/app/ui/TopBar.tsx

@@ -11,7 +11,7 @@ export function TopBar({ onSettingsClick, className }: TopBarProps) {
   return (
     <header
       className={cn(
-        "flex h-10 items-center gap-2 border-b border-border bg-background/80 pl-20 pr-3 backdrop-blur-sm",
+        "flex h-10 items-center gap-2 bg-background/80 pl-20 pr-3 backdrop-blur-sm",
         className,
       )}
       data-tauri-drag-region

ui/goose2/src/features/status/ui/StatusBar.tsx

@@ -26,7 +26,7 @@ export function StatusBar({
   return (
     <div
       className={cn(
-        "flex h-6 w-full items-center justify-between border-t border-border",
+        "flex h-6 w-full items-center justify-between",
         "bg-background/80 px-3 text-xs text-muted-foreground",
       )}
     >