fix: fromDecimal Auto delimiter now correctly handles multiple numbers

Fixes #2217

Summary:
The fromDecimal function now correctly handles the 'Auto' delimiter mode,
similar to fromHex. Previously, when delim='Auto' (the default), it would
only parse the first number, ignoring subsequent numbers regardless of
the separator used.

Changes:
- src/core/lib/Decimal.mjs:
  * When delim='Auto', use regex /[^\d-]+/ to split on any non-digit,
    non-minus character (automatically detecting delimiters)
  * Filter out empty strings from split result
  * Matches the behavior of fromHex's Auto mode

- tests/operations/tests/FromDecimal.mjs:
  * Added test cases for Auto delimiter with space, comma, and mixed separators
  * Ensures Auto mode correctly parses multiple numbers with various delimiters

Before:
  Input: "72 101 108 108 111" (Auto delimiter)
  Output: Only parsed 72 (first number)

After:
  Input: "72 101 108 108 111" (Auto delimiter)
  Output: Correctly parsed all numbers → "Hello"

src/core/lib/Decimal.mjs

@@ -24,12 +24,19 @@ import Utils from "../Utils.mjs";
  * fromDecimal("10:20:30", "Colon");
  */
 export function fromDecimal(data, delim="Auto") {
+    let byteStr;
+    if (delim === "Auto") {
+        // Auto mode: split on any non-digit, non-minus character (similar to fromHex)
+        byteStr = data.split(/[^\d-]+/);
+    } else {
         delim = Utils.charRep(delim);
-    const output = [];
+        byteStr = data.split(delim);
-    let byteStr = data.split(delim);
+    }
-    if (byteStr[byteStr.length-1] === "")
-        byteStr = byteStr.slice(0, byteStr.length-1);
     
+    // Remove empty strings from the array
+    byteStr = byteStr.filter(str => str !== "");
+
+    const output = [];
     for (let i = 0; i < byteStr.length; i++) {
         output[i] = parseInt(byteStr[i], 10);
     }

tests/operations/tests/FromDecimal.mjs

@@ -30,4 +30,37 @@ TestRegister.addTests([
             },
         ],
     },
+    {
+        name: "From Decimal with Auto delimiter (space)",
+        input: "72 101 108 108 111",
+        expectedOutput: "Hello",
+        recipeConfig: [
+            {
+                op: "From Decimal",
+                args: ["Auto", false]
+            },
+        ],
+    },
+    {
+        name: "From Decimal with Auto delimiter (comma)",
+        input: "72,101,108,108,111",
+        expectedOutput: "Hello",
+        recipeConfig: [
+            {
+                op: "From Decimal",
+                args: ["Auto", false]
+            },
+        ],
+    },
+    {
+        name: "From Decimal with Auto delimiter (mixed)",
+        input: "72, 101 : 108; 108\t111",
+        expectedOutput: "Hello",
+        recipeConfig: [
+            {
+                op: "From Decimal",
+                args: ["Auto", false]
+            },
+        ],
+    },
 ]);