fix: remove 5 unused variables across 4 user/credentials files

- PasswordReset.tsx: remove unused result variable
- UserProfile.tsx: remove unused Key import and err variable
- version-check-modal.tsx: remove unused setVersionDismissed setter
- CredentialsManager.tsx: remove unused e parameter from handleDragLeave

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

src/ui/Desktop/User/UserProfile.tsx

@@ -8,7 +8,7 @@ import {
   TabsTrigger,
 } from "@/components/ui/tabs.tsx";
 import { Separator } from "@/components/ui/separator.tsx";
-import { User, Shield, Key, AlertCircle } from "lucide-react";
+import { User, Shield, AlertCircle } from "lucide-react";
 import { TOTPSetup } from "@/ui/Desktop/User/TOTPSetup.tsx";
 import { getUserInfo } from "@/ui/main-axios.ts";
 import { getVersionInfo } from "@/ui/main-axios.ts";
@@ -45,7 +45,7 @@ export function UserProfile({ isTopbarOpen = true }: UserProfileProps) {
     try {
       const info = await getVersionInfo();
       setVersionInfo({ version: info.localVersion });
-    } catch (err) {
+    } catch {
       const { toast } = await import("sonner");
       toast.error(t("user.failedToLoadVersionInfo"));
     }