fix(ui): address greptile sidebar rail review

ui/src/components/KeyboardShortcutsCheatsheet.tsx

@@ -11,11 +11,13 @@ interface ShortcutEntry {
 // Platform-appropriate label for the Cmd/Ctrl modifier so the cheatsheet shows
 // the same key the user actually presses (re-pointed in the collapsible sidebar
 // work — Cmd/Ctrl+B toggles the rail).
-const META_KEY =
-  typeof navigator !== "undefined" &&
-  /Mac|iPhone|iPad|iPod/.test(navigator.platform || navigator.userAgent || "")
-    ? "⌘"
-    : "Ctrl";
+function getPlatformLabel() {
+  if (typeof navigator === "undefined") return "";
+  const nav = navigator as Navigator & { userAgentData?: { platform?: string } };
+  return nav.userAgentData?.platform || navigator.userAgent || "";
+}
+
+const META_KEY = /Mac|iPhone|iPad|iPod/.test(getPlatformLabel()) ? "⌘" : "Ctrl";
 
 interface ShortcutSection {
   title: string;

ui/src/components/SidebarAccountMenu.tsx

@@ -17,7 +17,7 @@ import { useSidebar } from "../context/SidebarContext";
 import { useTheme } from "../context/ThemeContext";
 import { Popover, PopoverContent, PopoverTrigger } from "@/components/ui/popover";
 import { Avatar, AvatarFallback, AvatarImage } from "@/components/ui/avatar";
-import { cn } from "../lib/utils";
+import { cn, SIDEBAR_RAIL_HIDDEN_LABEL } from "../lib/utils";
 
 const PROFILE_SETTINGS_PATH = "/company/settings/instance/profile";
 const DOCS_URL = "https://docs.paperclip.ing/";
@@ -151,7 +151,7 @@ export function SidebarAccountMenu({
               {session?.user.image ? <AvatarImage src={session.user.image} alt={displayName} /> : null}
               <AvatarFallback>{initials}</AvatarFallback>
             </Avatar>
-            <span className={cn("min-w-0 flex-1 truncate", rail && "sr-only")}>{displayName}</span>
+            <span className={cn("min-w-0 flex-1 truncate", rail && SIDEBAR_RAIL_HIDDEN_LABEL)}>{displayName}</span>
           </button>
         </PopoverTrigger>
         <PopoverContent

ui/src/components/SidebarCompanyMenu.tsx

@@ -36,7 +36,7 @@ import { useCompany } from "@/context/CompanyContext";
 import { useDialogActions } from "@/context/DialogContext";
 import { useCompanyOrder } from "@/hooks/useCompanyOrder";
 import { queryKeys } from "@/lib/queryKeys";
-import { cn } from "@/lib/utils";
+import { cn, SIDEBAR_RAIL_HIDDEN_LABEL } from "@/lib/utils";
 import { useSidebar } from "../context/SidebarContext";
 import { CompanyPatternIcon } from "./CompanyPatternIcon";
 
@@ -235,7 +235,7 @@ export function SidebarCompanyMenu({ open: controlledOpen, onOpenChange }: Sideb
         >
           <span className="flex min-w-0 flex-1 items-center gap-2">
             {selectedCompany ? <WorkspaceIcon company={selectedCompany} /> : null}
-            <span className={cn("truncate text-sm font-bold text-foreground", rail && "sr-only")}>
+            <span className={cn("truncate text-sm font-bold text-foreground", rail && SIDEBAR_RAIL_HIDDEN_LABEL)}>
               {selectedCompany?.name ?? "Select workspace"}
             </span>
           </span>