style: auto-fix ESLint issues (curly braces and formatting)

- Add curly braces to all if/else/for/while statements
- Fix indentation and trailing spaces
- Auto-fixed 372 linting errors using eslint --fix
- Remaining issues are warnings only (non-null assertions, explicit any types)

src/gateway/ui/pages/usage.js

@@ -13,14 +13,14 @@ function formatNumber(n) {
 }
 
 function formatCost(n) {
-  if (!n || n === 0) return '$0.00';
-  if (n < 0.01) return `$${n.toFixed(4)}`;
+  if (!n || n === 0) {return '$0.00';}
+  if (n < 0.01) {return `$${n.toFixed(4)}`;}
   return `$${n.toFixed(2)}`;
 }
 
 function truncateId(id) {
-  if (!id) return '-';
-  if (id.length <= 24) return id;
+  if (!id) {return '-';}
+  if (id.length <= 24) {return id;}
   return id.slice(0, 24) + '\u2026';
 }
 
@@ -95,7 +95,7 @@ async function loadUsage(el, client) {
       let delegationCell = '<span class="text-muted">-</span>';
       if (delegationEntries.length > 0) {
         delegationCell = delegationEntries.map(([tier, stats]) =>
-          `<span class="badge ok">${tier}</span> ${formatNumber(stats.inputTokens)}/${formatNumber(stats.outputTokens)}`
+          `<span class="badge ok">${tier}</span> ${formatNumber(stats.inputTokens)}/${formatNumber(stats.outputTokens)}`,
         ).join('<br>');
       }