fix: remove nonsensical $X% fee format, use percentage only

Fee displays combined dollar sign with percent sign (e.g. $0.02%)
which is invalid in any financial context. Changed to percentage
format (0.02%) across all three locations: simulation results,
canvas inspector, and right panel context display.

Co-Authored-By: Nakamoto, S <defi@defi-oracle.io>

src/App.tsx

@@ -365,7 +365,7 @@ export default function App() {
       const fee = (Math.random() * 0.1).toFixed(4);
       const results = [
         `Simulation complete for ${nodes.length} nodes, ${edges.length} edges`,
-        `Estimated fees: $${fee}%`,
+        `Estimated fees: ${fee}%`,
         `Settlement window: T+${routingNodes.length > 0 ? '1' : '2'}`,
         `Compliance: ${hasCompliance ? 'All checks passed' : 'WARNING - No compliance checks in flow'}`,
         `Routing: ${routingNodes.length} venue(s) evaluated`,

src/components/Canvas.tsx

@@ -321,7 +321,7 @@ function CanvasInner({
         <div className="inspector-separator" />
         <div className="inspector-item">
           <DollarSign size={12} />
-          <span>Est. fees: {nodes.length > 0 ? '$0.02%' : '—'}</span>
+          <span>Est. fees: {nodes.length > 0 ? '0.02%' : '—'}</span>
         </div>
         <div className="inspector-item">
           <Clock size={12} />

src/components/RightPanel.tsx

@@ -287,7 +287,7 @@ export default function RightPanel({
           </div>
           <div className="context-section">
             <span className="context-label">Est. Fees</span>
-            <span className="context-value">{ctx.nodeCount > 0 ? '$0.02%' : '—'}</span>
+            <span className="context-value">{ctx.nodeCount > 0 ? '0.02%' : '—'}</span>
           </div>
         </div>
       )}