feat: User setting for image display (#1291)

## Summary

**What is the goal of this PR?** Add a user setting to decide image
support: display, show placeholder instead, supress fully

Fixes #1289

---

### AI Usage

While CrossPoint doesn't have restrictions on AI tools in contributing,
please be transparent about their usage as it
helps set the right context for reviewers.

Did you use AI tools to help write this code? _**< NO >**_

src/activities/reader/EpubReaderActivity.cpp

@@ -571,14 +571,16 @@ void EpubReaderActivity::render(RenderLock&& lock) {
 
     if (!section->loadSectionFile(SETTINGS.getReaderFontId(), SETTINGS.getReaderLineCompression(),
                                   SETTINGS.extraParagraphSpacing, SETTINGS.paragraphAlignment, viewportWidth,
-                                  viewportHeight, SETTINGS.hyphenationEnabled, SETTINGS.embeddedStyle)) {
+                                  viewportHeight, SETTINGS.hyphenationEnabled, SETTINGS.embeddedStyle,
+                                  SETTINGS.imageRendering)) {
       LOG_DBG("ERS", "Cache not found, building...");
 
       const auto popupFn = [this]() { GUI.drawPopup(renderer, tr(STR_INDEXING)); };
 
       if (!section->createSectionFile(SETTINGS.getReaderFontId(), SETTINGS.getReaderLineCompression(),
                                       SETTINGS.extraParagraphSpacing, SETTINGS.paragraphAlignment, viewportWidth,
-                                      viewportHeight, SETTINGS.hyphenationEnabled, SETTINGS.embeddedStyle, popupFn)) {
+                                      viewportHeight, SETTINGS.hyphenationEnabled, SETTINGS.embeddedStyle,
+                                      SETTINGS.imageRendering, popupFn)) {
         LOG_ERR("ERS", "Failed to persist page data to SD");
         section.reset();
         return;