Refactor indicators to support optional time step in Prime method

- Updated the Prime method signature in multiple indicators (Jma, Kama, Lsma, Mama, Mgdi, Pwma, Rma, Sma, Ssf, Super, T3, Tema, Trima, Usf, Vidya, Wma, Atr) to accept an optional TimeSpan parameter for improved flexibility.
- Added unit tests for Lsma to verify Dispose functionality, ensuring proper unsubscription from the source and thread safety.
- Enhanced Mama and Wma classes to handle non-finite inputs gracefully and added checks for valid parameters in constructors.
- Introduced additional tests for T3 to validate constructor behavior with invalid volume factors.
- Ensured all indicators maintain consistent behavior when handling edge cases, such as empty buffers and non-finite values.

lib/trends/dema/Dema.cs

@@ -129,7 +129,12 @@ public sealed class Dema : AbstractBase, IDisposable
 
         var sourceValues = source.Values;
 
-        // Use current state
+        // Capture pre-batch state for rollback
+        EmaState preBatch_s1 = _state1;
+        EmaState preBatch_s2 = _state2;
+        double preBatch_lastValid = _lastValidValue;
+
+        // Use current state for calculation
         EmaState s1 = _state1;
         EmaState s2 = _state2;
         double lastValid = _lastValidValue;
@@ -156,19 +161,21 @@ public sealed class Dema : AbstractBase, IDisposable
             vSpan[i] = 2 * e1 - e2;
         }
 
-        // Update instance state
+        // Update instance state with post-batch values
         _state1 = s1;
         _state2 = s2;
-        _p_state1 = s1;
-        _p_state2 = s2;
         _lastValidValue = lastValid;
-        _p_lastValidValue = lastValid;
+
+        // Preserve pre-batch state for rollback (isNew=false)
+        _p_state1 = preBatch_s1;
+        _p_state2 = preBatch_s2;
+        _p_lastValidValue = preBatch_lastValid;
 
         Last = new TValue(tSpan[len - 1], vSpan[len - 1]);
         return new TSeries(t, v);
     }
 
-    public override void Prime(ReadOnlySpan<double> source)
+    public override void Prime(ReadOnlySpan<double> source, TimeSpan? step = null)
     {
         foreach (var value in source)
         {