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-real-overview.mjs

@@ -79,6 +79,7 @@ const main = async () => {
           showMonitor: false,
           showSubagents: false,
           showProjectInsights: false,
+          showTokenCount: false,
         };
         if (planUsage) blob.showPlanUsageLimits = true;
         localStorage.setItem('codeman-app-settings', JSON.stringify(blob));