refactor: Right-align stock change percentage column

m5paper-stockticker.ino

@@ -224,10 +224,10 @@ void setup() {
   int ROWY = (SCREEN_BOTTOM - ROW0) / NUM_STOCKS;
 
   // Pick the largest font that fits the row height, with matching column positions
-  int textSz, colPrice, colArrow, colChg, arrowSz, arrowOff;
+  int textSz, charW, colPrice, colArrow, arrowSz, arrowOff;
-  if      (ROWY >= 48) { textSz=3; colPrice=240; colArrow=455; colChg=500; arrowSz=32; arrowOff=6; }
+  if      (ROWY >= 48) { textSz=3; charW=24; colPrice=240; colArrow=460; arrowSz=20; arrowOff=14; }
-  else if (ROWY >= 32) { textSz=2; colPrice=168; colArrow=300; colChg=340; arrowSz=22; arrowOff=4; }
+  else if (ROWY >= 32) { textSz=2; charW=16; colPrice=168; colArrow=310; arrowSz=14; arrowOff= 9; }
-  else                 { textSz=1; colPrice= 84; colArrow=152; colChg=168; arrowSz=12; arrowOff=2; }
+  else                 { textSz=1; charW= 8; colPrice= 84; colArrow=152; arrowSz= 8; arrowOff= 4; }
 
   M5.Display.setTextSize(textSz);
 
@@ -244,8 +244,11 @@ void setup() {
       if (sd[i].change >= 0.0f) drawUpArrow  (colArrow, y + arrowOff, arrowSz);
       else                       drawDownArrow(colArrow, y + arrowOff, arrowSz);
 
-      M5.Display.setCursor(colChg, y);
+      // Right-align change text so all closing ')' line up at x=940
-      M5.Display.printf("%+.2f (%+.2f%%)", sd[i].change, sd[i].pct);
+      char chgBuf[32];
+      snprintf(chgBuf, sizeof(chgBuf), "%+.2f (%+.2f%%)", sd[i].change, sd[i].pct);
+      M5.Display.setCursor(940 - (int)strlen(chgBuf) * charW, y);
+      M5.Display.print(chgBuf);
     } else {
       M5.Display.setCursor(240, y);
       M5.Display.print("     N/A");