mod: overhaul reader menu with long-press actions and quick toggles

Consolidate dictionary items: remove "Lookup Word History" and
"Delete Dictionary Cache" from the menu. Long-press on "Lookup Word"
opens history; delete-dict-cache is now a sentinel entry at the bottom
of the history list.

Replace "Reading Orientation" with "Toggle Portrait/Landscape" that
toggles between two configurable preferred orientations (new settings:
Preferred Portrait, Preferred Landscape). Long-press opens a manual
4-option orientation sub-menu.

Add "Toggle Font Size" menu item that cycles through font sizes and
applies on menu exit (with section re-layout).

Rename "Letterbox Fill" to "Override Letterbox Fill" and
"Sync Progress" to "Sync Reading Progress" in reader menu.

All long-press flows use ignoreNextConfirmRelease to prevent the
button release from triggering actions on the subsequent screen.

Co-authored-by: Cursor <cursoragent@cursor.com>

src/CrossPointSettings.h

@@ -183,6 +183,12 @@ class CrossPointSettings {
   // Use book's embedded CSS styles for EPUB rendering (1 = enabled, 0 = disabled)
   uint8_t embeddedStyle = 1;
 
+  // Preferred orientations for the portrait/landscape toggle in the reader menu.
+  // preferredPortrait: PORTRAIT (0) or INVERTED (2)
+  // preferredLandscape: LANDSCAPE_CW (1) or LANDSCAPE_CCW (3)
+  uint8_t preferredPortrait = PORTRAIT;
+  uint8_t preferredLandscape = LANDSCAPE_CW;
+
   ~CrossPointSettings() = default;
 
   // Get singleton instance