Clarify unlock password field for hidden volume usage

Author: srv1n

frontend/src/App.jsx

@@ -139,15 +139,15 @@ function UnlockScreen() {
                         {/* Password Input */}
                         <div>
                             <label className="block text-sm font-medium text-foreground mb-3">
-                                Password
+                                Password (standard or hidden)
                             </label>
                             <input
                                 type="password"
                                 required
                                 value={password}
                                 onChange={(e) => setPassword(e.target.value)}
                                 className="flex h-11 w-full rounded-md border border-input bg-background px-3 py-2 text-sm ring-offset-background file:border-0 file:bg-transparent file:text-sm file:font-medium placeholder:text-muted-foreground focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2 disabled:cursor-not-allowed disabled:opacity-50"
-                                placeholder="Enter your password"
+                                placeholder="Enter standard or hidden volume password"
                                 disabled={loading}
                             />
                         </div>
@@ -447,4 +447,4 @@ function App() {
     );
 }
 
-export default App;
+export default App;