cap bbqr display and pdf encodings at the 1295 parts the header can number, using larger parts for data that needs more rather than emitting a sequence that cannot be reassembled

### src/main/java/com/sparrowwallet/sparrow/io/bbqr/BBQREncoder.java
@@ -4,6 +4,8 @@
 import java.util.List;
 
 public class BBQREncoder {
+    private static final int MAX_PARTS = 36 * 36 - 1;
+
     private final String[] parts;
     private int partIndex;
 
@@ -48,14 +50,17 @@ private List<String> encode(BBQRType type, BBQREncoding desiredEncoding, byte[]
         }
 
         int inputLength = encoded.length();
-        int numChunks = (inputLength + desiredChunkSize - 1) / desiredChunkSize;
+        //The header numbers parts with two base36 characters, so data needing more parts is split into larger ones
+        int numChunks = Math.min((inputLength + desiredChunkSize - 1) / desiredChunkSize, MAX_PARTS);
         int chunkSize = numChunks == 1 ? desiredChunkSize : (int)Math.ceil((double)inputLength / numChunks);
 
         int modulo = chunkSize % encoding.getPartModulo();
         if(modulo > 0) {
             chunkSize += (encoding.getPartModulo() - modulo);
         }
 
+        numChunks = (inputLength + chunkSize - 1) / chunkSize;
+
         List<String> chunks = new ArrayList<>();
         int startIndex = 0;
         for(int i = 0; i < numChunks; i ++) {

### src/test/java/com/sparrowwallet/sparrow/io/bbqr/BBQREncoderTest.java
@@ -31,4 +31,25 @@ public void testEncoding() {
             }
         }
     }
+
+    @Test
+    public void testEncodingBeyondMaxParts() {
+        //At 1000 character fragments this data needs 1440 parts, more than two base36 header characters can number
+        byte[] data = new byte[900000];
+        new Random().nextBytes(data);
+
+        BBQREncoder encoder = new BBQREncoder(BBQRType.BINARY, BBQREncoding.BASE32, data, QRDensity.LOW.getMaxBbqrFragmentLength(), 0);
+        Assertions.assertTrue(encoder.getNumParts() <= 1295, "Encoded " + encoder.getNumParts() + " parts");
+
+        BBQRDecoder decoder = new BBQRDecoder();
+        for(int i = 0; i < encoder.getNumParts(); i++) {
+            String part = encoder.nextPart();
+            Assertions.assertEquals(encoder.getNumParts(), BBQRHeader.fromString(part).seqTotal());
+            Assertions.assertTrue(part.length() > 8);
+            decoder.receivePart(part);
+        }
+
+        Assertions.assertEquals(BBQRDecoder.ResultType.SUCCESS, decoder.getResult().getResultType());
+        Assertions.assertArrayEquals(data, decoder.getResult().getData());
+    }
 }