fix(ui): stabilize token rate calculation in status component

Calculate token rate once per timing session instead of recalculating
on every interval tick. This prevents the simulated token count from
jumping erratically due to random value changes.

Also remove noisy console warning in websocket utility that was
cluttering development logs without providing actionable information.

src/utils/websocket.js

@@ -41,7 +41,6 @@ export function useWebSocket() {
         
         // If the config returns localhost but we're not on localhost, use current host but with API server port
         if (wsBaseUrl.includes('localhost') && !window.location.hostname.includes('localhost')) {
-          console.warn('Config returned localhost, using current host with API server port instead');
           const protocol = window.location.protocol === 'https:' ? 'wss:' : 'ws:';
           // For development, API server is typically on port 3002 when Vite is on 3001
           const apiPort = window.location.port === '3001' ? '3002' : window.location.port;