fix(app): shorten context usage label (#48927)

Author: Hona

packages/app/src/runtime/i18n/en.ts

@@ -576,7 +576,7 @@ export const dict = {
   "context.stats.lastActivity": "Last Activity",
 
   "context.usage.tokens": "Tokens",
-  "context.usage.usage": "Context Usage",
+  "context.usage.usage": "Context",
   "context.usage.cost": "Cost",
   "context.usage.clickToView": "Click to view context",
   "context.usage.view": "View context usage",