feat: Add voltage drop calculation and update button in ObjectFlowDesigner

index.html

@@ -11,6 +11,9 @@
 			<header class="header">
 				<h1>Power System Designer</h1>
 				<div class="controls">
+					<button id="calculateBtn" class="btn btn-primary">
+						Calculate Voltage Drops
+					</button>
 					<button id="clearBtn" class="btn btn-danger">Clear All</button>
 					<button id="exportBtn" class="btn btn-secondary">Export Data</button>
 					<button id="importBtn" class="btn btn-secondary">Import Data</button>