feat(ui): clean default header (usage chips, file viewer on; token chip, lifecycle log off)

The default desktop header right cluster is now: WS, CPU, MEM, File Viewer
folder button, 5H/7D plan-usage chips, gear. The token-count chip and the
lifecycle-log document button default OFF (both still honor stored prefs),
and the File Viewer button defaults ON (phones keep hiding it via mobile.css).
Templates ship the hidden/shown state so nothing flashes before settings load.
Capture scripts seed showTokenCount:false so screenshots match regardless of
server defaults.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

scripts/capture-subagent-screenshots.mjs

@@ -221,6 +221,7 @@ async function configureSettings(page) {
       subagentTrackingEnabled: true,
       subagentActiveTabOnly: false, // Show all subagents regardless of active tab
       showMonitor: true,
+      showTokenCount: false,
     };
     localStorage.setItem('codeman-app-settings', JSON.stringify(settings));
   });