fix: revert label to 'Symbol', highlight ticker in sidebar nav

- Revert ConfluencePanel label back to just 'Symbol'
- In SidebarNav, render 'Symbol: IREN' with the ticker in accent/pink color

app/src/components/ConfluencePanel.tsx

@@ -127,9 +127,7 @@ export function ConfluencePanel() {
       {/* Header */}
       <div className="flex flex-wrap items-end gap-4">
         <div>
-          <label className="block text-xs text-fg-muted mb-1">
-            Symbol: <span className="text-accent font-medium">{symbol}</span>
-          </label>
+          <label className="block text-xs text-fg-muted mb-1">Symbol</label>
           <div className="relative w-48">
             <SymbolAutocomplete
               value={searchQuery}

app/src/components/SidebarNav.tsx

@@ -138,7 +138,9 @@ export function SidebarNav({ collapsed: panelCollapsed, onToggle }: { collapsed?
 
   // Research → "Symbol" shows the focused ticker, e.g. "Symbol: IREN"
   const itemLabel = (item: { label: string }) =>
-    item.label === "Symbol" && activeSymbol ? `Symbol: ${activeSymbol}` : item.label;
+    item.label === "Symbol" && activeSymbol ? (
+      <span>Symbol: <span className="text-accent font-medium">{activeSymbol}</span></span>
+    ) : item.label;
 
   const visibleSections = SECTIONS
     .filter((s) => modules.includes(s.module))