Adds margin setting and calibre web

Also made the menu items dynamic and capital case. Looks better from a design perspective but I suppose this is an optional thing to accept

src/CrossPointSettings.h

@@ -44,6 +44,7 @@ class CrossPointSettings {
   enum FONT_SIZE { SMALL = 0, MEDIUM = 1, LARGE = 2, EXTRA_LARGE = 3 };
   enum LINE_COMPRESSION { TIGHT = 0, NORMAL = 1, WIDE = 2 };
   enum PARAGRAPH_ALIGNMENT { JUSTIFIED = 0, LEFT_ALIGN = 1, CENTER_ALIGN = 2, RIGHT_ALIGN = 3 };
+  enum SIDE_MARGIN { MARGIN_NONE = 0, MARGIN_SMALL = 1, MARGIN_MEDIUM = 2, MARGIN_LARGE = 3 };
 
   // Sleep screen settings
   uint8_t sleepScreen = DARK;
@@ -64,6 +65,9 @@ class CrossPointSettings {
   uint8_t fontSize = MEDIUM;
   uint8_t lineSpacing = NORMAL;
   uint8_t paragraphAlignment = JUSTIFIED;
+  uint8_t sideMargin = MARGIN_SMALL;
+  // OPDS browser settings
+  char opdsServerUrl[128] = "";  // e.g., "https://home.jmitch.com/books"
 
   ~CrossPointSettings() = default;
 
@@ -77,6 +81,7 @@ class CrossPointSettings {
   bool loadFromFile();
 
   float getReaderLineCompression() const;
+  int getReaderSideMargin() const;
 };
 
 // Helper macro to access settings