[PictureLoader] Address review comments

- Make deleteAllLocalOverrides static; it does not touch instance state
- Drop the now-unused hasCustomArt dead code
- Rename the override install methods to installPrintingOverride /
  installPrintingOverrideOnLoad

cockatrice/src/interface/card_picture_loader/card_picture_loader.cpp

@@ -8,7 +8,7 @@
 #include <QApplication>
 #include <QBuffer>
 #include <QDebug>
-#include <QDirIterator>
+#include <QDir>
 #include <QFileInfo>
 #include <QMainWindow>
 #include <QMovie>
@@ -334,8 +334,7 @@ void CardPictureLoader::saveCardImageToLocalStorage(const ExactCard &card,
     }
 }
 
-void CardPictureLoader::overridePrintingConnectLocalSaveAndEnqueue(const ExactCard &originalCard,
-                                                                   const ExactCard &overrideCard)
+void CardPictureLoader::installPrintingOverrideOnLoad(const ExactCard &originalCard, const ExactCard &overrideCard)
 {
     // Overriding a card with itself is the reset case, not a real override: every code path below
     // would re-enter itself through emitPixmapUpdated(). Reject it outright.
@@ -391,10 +390,9 @@ void CardPictureLoader::overridePrintingConnectLocalSaveAndEnqueue(const ExactCa
     CardPictureLoader::getInstance().worker->enqueueImageLoad(overrideCard);
 }
 
-void CardPictureLoader::overridePrintingEnsurePixmapExistsAndSaveLocally(const ExactCard &originalCard,
-                                                                         const ExactCard &overrideCard)
+void CardPictureLoader::installPrintingOverride(const ExactCard &originalCard, const ExactCard &overrideCard)
 {
-    // Same guard as overridePrintingConnectLocalSaveAndEnqueue: self-override is the reset case.
+    // Same guard as installPrintingOverrideOnLoad: self-override is the reset case.
     if (originalCard == overrideCard) {
         return;
     }
@@ -409,7 +407,7 @@ void CardPictureLoader::overridePrintingEnsurePixmapExistsAndSaveLocally(const E
     }
 
     // Cache miss or previously failed load — enqueue load and wait for the signal.
-    overridePrintingConnectLocalSaveAndEnqueue(originalCard, overrideCard);
+    installPrintingOverrideOnLoad(originalCard, overrideCard);
 }
 
 bool CardPictureLoader::hasLocalOverrides(const ExactCard &card)
@@ -499,32 +497,3 @@ void CardPictureLoader::cardLangChanged()
     QPixmapCache::clear();
     failedAt.clear();
 }
-
-bool CardPictureLoader::hasCustomArt()
-{
-    auto picsPath = SettingsCache::instance().paths().getPicsPath();
-    QDirIterator it(picsPath, QDir::Dirs | QDir::NoDotAndDotDot);
-
-    // Check if there is at least one non-directory file in the pics path, other
-    // than in the "downloadedPics" subdirectory.
-    while (it.hasNext()) {
-#if (QT_VERSION >= QT_VERSION_CHECK(6, 3, 0))
-        QFileInfo dir(it.nextFileInfo());
-#else
-        // nextFileInfo() is only available in Qt 6.3+, for previous versions, we build
-        // the QFileInfo from a QString which requires more system calls.
-        QFileInfo dir(it.next());
-#endif
-
-        if (it.fileName() == "downloadedPics") {
-            continue;
-        }
-
-        QDirIterator subIt(it.filePath(), QDir::Files, QDirIterator::Subdirectories | QDirIterator::FollowSymlinks);
-        if (subIt.hasNext()) {
-            return true;
-        }
-    }
-
-    return false;
-}

cockatrice/src/interface/card_picture_loader/card_picture_loader.h

@@ -96,12 +96,6 @@ public:
      */
     static void cacheCardPixmaps(const QList<ExactCard> &cards);
 
-    /**
-     * @brief Check if the user has custom card art in the picsPath directory.
-     * @return True if any custom art exists.
-     */
-    static bool hasCustomArt();
-
     /**
      * @brief Check if a local override image already exists for the card.
      * @param card The card to check.
@@ -109,6 +103,12 @@ public:
      */
     static bool hasLocalOverrides(const ExactCard &card);
 
+    /**
+     * @brief Removes all locally stored override images for the card.
+     * @param card The card to remove the override images of.
+     */
+    static void deleteAllLocalOverrides(const ExactCard &card);
+
     /**
      * @brief Clears the in-memory QPixmap cache for all cards.
      */
@@ -127,10 +127,9 @@ public slots:
      * @param image Loaded QImage.
      */
     void imageLoaded(const ExactCard &card, const QImage &image);
-    void deleteAllLocalOverrides(const ExactCard &card);
     void saveCardImageToLocalStorage(const ExactCard &card, const QPixmap &pixmap, bool allowOverwrite = false);
-    void overridePrintingConnectLocalSaveAndEnqueue(const ExactCard &originalCard, const ExactCard &overrideCard);
-    void overridePrintingEnsurePixmapExistsAndSaveLocally(const ExactCard &originalCard, const ExactCard &overrideCard);
+    void installPrintingOverride(const ExactCard &originalCard, const ExactCard &overrideCard);
+    void installPrintingOverrideOnLoad(const ExactCard &originalCard, const ExactCard &overrideCard);
 
 private slots:
     /**