fix: DotCode ensure height+width is odd per spec

When both dimensions are odd (sum is even), increment height by 1
to make it even, ensuring the sum is odd as required by AIM ISS DotCode.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: productdevbook

src/encoders/dotcode.ts

@@ -162,10 +162,9 @@ export function encodeDotCode(text: string): boolean[][] {
   if (height % 2 === 0) height++;
 
   // Ensure height + width is odd (DotCode constraint)
-  // Currently both are odd, so sum is even. Adjust width by +2 to keep it odd
-  // while making the sum odd.
+  // Make one dimension even and one odd so their sum is odd
   if ((height + width) % 2 === 0) {
-    width += 2;
+    height++;
   }
 
   // Pad data codewords to fill available data capacity