feat: quick rotate option in epub reader menu (#685)

## Summary

* adds rotation setting in epub reader menu, actual rotation happens on
going back
* improves button hint drawing to draw correctly in all orientations

<img width="860" height="1147" alt="image"
src="https://github.com/user-attachments/assets/91ceeca6-729f-4304-b68a-e412f6e2c9a7"
/>


---

### AI Usage

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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? _**< PARTIALLY  >**_

src/activities/reader/EpubReaderMenuActivity.cpp

@@ -57,9 +57,16 @@ void EpubReaderMenuActivity::loop() {
     selectedIndex = (selectedIndex + 1) % menuItems.size();
     updateRequired = true;
   } else if (mappedInput.wasReleased(MappedInputManager::Button::Confirm)) {
+    const auto selectedAction = menuItems[selectedIndex].action;
+    if (selectedAction == MenuAction::ROTATE_SCREEN) {
+      // Cycle orientation preview locally; actual rotation happens on menu exit.
+      pendingOrientation = (pendingOrientation + 1) % orientationLabels.size();
+      updateRequired = true;
+      return;
+    }
+
     // 1. Capture the callback and action locally
     auto actionCallback = onAction;
-    auto selectedAction = menuItems[selectedIndex].action;
 
     // 2. Execute the callback
     actionCallback(selectedAction);
@@ -67,7 +74,8 @@ void EpubReaderMenuActivity::loop() {
     // 3. CRITICAL: Return immediately. 'this' is likely deleted now.
     return;
   } else if (mappedInput.wasReleased(MappedInputManager::Button::Back)) {
-    onBack();
+    // Return the pending orientation to the parent so it can apply on exit.
+    onBack(pendingOrientation);
     return;  // Also return here just in case
   }
 }
@@ -75,14 +83,31 @@ void EpubReaderMenuActivity::loop() {
 void EpubReaderMenuActivity::renderScreen() {
   renderer.clearScreen();
   const auto pageWidth = renderer.getScreenWidth();
+  const auto orientation = renderer.getOrientation();
+  // Landscape orientation: button hints are drawn along a vertical edge, so we
+  // reserve a horizontal gutter to prevent overlap with menu content.
+  const bool isLandscapeCw = orientation == GfxRenderer::Orientation::LandscapeClockwise;
+  const bool isLandscapeCcw = orientation == GfxRenderer::Orientation::LandscapeCounterClockwise;
+  // Inverted portrait: button hints appear near the logical top, so we reserve
+  // vertical space to keep the header and list clear.
+  const bool isPortraitInverted = orientation == GfxRenderer::Orientation::PortraitInverted;
+  const int hintGutterWidth = (isLandscapeCw || isLandscapeCcw) ? 30 : 0;
+  // Landscape CW places hints on the left edge; CCW keeps them on the right.
+  const int contentX = isLandscapeCw ? hintGutterWidth : 0;
+  const int contentWidth = pageWidth - hintGutterWidth;
+  const int hintGutterHeight = isPortraitInverted ? 50 : 0;
+  const int contentY = hintGutterHeight;
 
   // Title
   const std::string truncTitle =
-      renderer.truncatedText(UI_12_FONT_ID, title.c_str(), pageWidth - 40, EpdFontFamily::BOLD);
-  renderer.drawCenteredText(UI_12_FONT_ID, 15, truncTitle.c_str(), true, EpdFontFamily::BOLD);
+      renderer.truncatedText(UI_12_FONT_ID, title.c_str(), contentWidth - 40, EpdFontFamily::BOLD);
+  // Manual centering so we can respect the content gutter.
+  const int titleX =
+      contentX + (contentWidth - renderer.getTextWidth(UI_12_FONT_ID, truncTitle.c_str(), EpdFontFamily::BOLD)) / 2;
+  renderer.drawText(UI_12_FONT_ID, titleX, 15 + contentY, truncTitle.c_str(), true, EpdFontFamily::BOLD);
 
   // Menu Items
-  constexpr int startY = 60;
+  const int startY = 60 + contentY;
   constexpr int lineHeight = 30;
 
   for (size_t i = 0; i < menuItems.size(); ++i) {
@@ -90,10 +115,18 @@ void EpubReaderMenuActivity::renderScreen() {
     const bool isSelected = (static_cast<int>(i) == selectedIndex);
 
     if (isSelected) {
-      renderer.fillRect(0, displayY, pageWidth - 1, lineHeight, true);
+      // Highlight only the content area so we don't paint over hint gutters.
+      renderer.fillRect(contentX, displayY, contentWidth - 1, lineHeight, true);
     }
 
-    renderer.drawText(UI_10_FONT_ID, 20, displayY, menuItems[i].label.c_str(), !isSelected);
+    renderer.drawText(UI_10_FONT_ID, contentX + 20, displayY, menuItems[i].label.c_str(), !isSelected);
+
+    if (menuItems[i].action == MenuAction::ROTATE_SCREEN) {
+      // Render current orientation value on the right edge of the content area.
+      const auto value = orientationLabels[pendingOrientation];
+      const auto width = renderer.getTextWidth(UI_10_FONT_ID, value);
+      renderer.drawText(UI_10_FONT_ID, contentX + contentWidth - 20 - width, displayY, value, !isSelected);
+    }
   }
 
   // Footer / Hints