[desktop] Allow installation of keys from the initial warning box (#3402)

whynot

Signed-off-by: crueter <crueter@eden-emu.dev>
Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/3402
Reviewed-by: Lizzie <lizzie@eden-emu.dev>
Reviewed-by: MaranBr <maranbr@eden-emu.dev>

src/qt_common/util/content.cpp

@@ -1,4 +1,4 @@
-// SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
+// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
 // SPDX-License-Identifier: GPL-3.0-or-later
 
 #include "qt_common/util/content.h"
@@ -267,9 +267,8 @@ void InstallKeys()
                                               {},
                                               QtCommon::Frontend::Option::ReadOnly);
 
-    if (key_source_location.isEmpty()) {
+    if (key_source_location.isEmpty())
         return;
-    }
 
     FirmwareManager::KeyInstallResult result
         = FirmwareManager::InstallKeys(key_source_location.toStdString(), "keys");

src/yuzu/main_window.cpp

@@ -4275,9 +4275,15 @@ void MainWindow::OnMouseActivity() {
 
 void MainWindow::OnCheckFirmwareDecryption() {
     if (!ContentManager::AreKeysPresent()) {
-        QMessageBox::warning(this, tr("Derivation Components Missing"),
-                             tr("Encryption keys are missing."));
+        const auto res = QtCommon::Frontend::Warning(
+            tr("Derivation Components Missing"),
+            tr("Decryption keys are missing. Install them now?"),
+            QtCommon::Frontend::StandardButton::Yes | QtCommon::Frontend::StandardButton::No);
+
+        if (res == QtCommon::Frontend::StandardButton::Yes)
+            OnInstallDecryptionKeys();
     }
+
     SetFirmwareVersion();
     UpdateMenuState();
 }