Refactor eikonalActivationFlag handling in FEAScriptModel and frontPr…

…opagationScript

- Removed the global declaration of eikonalActivationFlag in FEAScriptModel.
- Initialized eikonalActivationFlag locally within the frontPropagationScript context.
- Updated frontPropagationScript to accept eikonalActivationFlag as a parameter without a default value.

src/FEAScript.js

@@ -65,7 +65,6 @@ export class FEAScriptModel {
     let initialSolution = [];
     let nodesCoordinates = {};
     let eikonalExteralIterations = 5; // Number of incremental steps to gradually activate the eikonal term - Used in frontPropagationScript
-    let eikonalActivationFlag = 0; // Activation parameter for the eikonal equation (ranges from 0 to 1) - Used in frontPropagationScript
     let newtonRaphsonIterations;
 
     // Select and execute the appropriate solver based on solverConfig
@@ -84,6 +83,9 @@ export class FEAScriptModel {
     } else if (this.solverConfig === "frontPropagationScript") {
       basicLog(`Using solver: ${this.solverConfig}`);
 
+      // Initialize eikonalActivationFlag
+      let eikonalActivationFlag = 0;
+
       // Create context object with all necessary properties
       const context = {
         meshConfig: this.meshConfig,

src/solvers/frontPropagationScript.js

@@ -31,7 +31,7 @@ export function assembleFrontPropagationMat(
   meshConfig,
   boundaryConditions,
   solutionVector,
-  eikonalActivationFlag = 0
+  eikonalActivationFlag
 ) {
   basicLog("Starting front propagation matrix assembly...");