fix(pdf): change pantone fallback function to type 2 for better viewer compatibility

scripts/inject-pantone.ts

@@ -18,14 +18,13 @@ async function run() {
   // CMYK tint transform for PANTONE 289 C.
   // Approximation: 100C, 64M, 0Y, 60K (1.0 0.64 0.0 0.60)
   // The function maps an input x (0 to 1) to CMYK: x*1.0, x*0.64, x*0.0, x*0.60
-  const tintTransform = pdfDoc.context.stream(
-    '{ dup 1.0 mul exch dup 0.64 mul exch dup 0.0 mul exch 0.60 mul }',
-    {
-      FunctionType: 4,
-      Domain: [0, 1],
-      Range: [0, 1, 0, 1, 0, 1, 0, 1],
-    },
-  );
+  const tintTransform = pdfDoc.context.obj({
+    FunctionType: 2,
+    Domain: [0, 1],
+    C0: [0, 0, 0, 0],
+    C1: [1.0, 0.64, 0.0, 0.6],
+    N: 1,
+  });
 
   // Create the /Separation color space array
   const pantoneCS = pdfDoc.context.obj([