Cleanup pass

Removed the getFontXHeight method from GfxRenderer interface. Updated documentation to clarify that getFontCapHeight returns the 'H' glyph height for optical alignment, and improved the comment for getTextVisualCenterOffset to be more concise.

src/main.cpp

@@ -299,11 +299,10 @@ void setupDisplayAndFonts(bool seamless = false) {
   renderer.insertFont(UI_12_FONT_ID, ui12FontFamily);
   renderer.insertFont(SMALL_FONT_ID, smallFontFamily);
 
-  // UI chrome font scaling on high-density / touch boards: Ubuntu UI is only built
-  // at 10/12pt, so remap the UI fonts up the Noto Sans ladder to grow chrome text
-  // with uiScale. SMALL is deliberately NOT remapped — it's secondary/compact text
-  // (reader status bar, subtitles, battery %) that should stay small so reader
-  // chrome doesn't balloon. Reader body fonts aren't remapped either.
+  // UI chrome font scaling on touch/high-density boards: Ubuntu UI is only built at
+  // 10/12pt, so remap the UI fonts up the Noto Sans ladder with uiScale. SMALL is
+  // deliberately not remapped — it's compact secondary text (status bar, subtitles,
+  // battery %) that stays small. Reader body fonts aren't remapped either.
   if (const float s = UITheme::uiScale(); s > 1.05f) {
     auto nearestNotoSans = [](float pt) -> int {
       const struct {