fix(04-05): three post-deploy bug fixes

- Admin client list: remove Timer column, rename Acconto→Importo incassato
  and Saldo→Importo da saldare (calculated from payment amounts, not badges)
- Project workspace timer: pass projectId prop to TimerCell so it calls
  startTimer(projectId) directly instead of startTimerForClient(projectId)
  which was failing with "nessun progetto trovato"
- Public client page: pass client.token (real DB token) not the URL path
  segment (which may be a slug) to ClientDashboard → fixes approve/chat APIs

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/components/admin/tabs/TimerTab.tsx

@@ -26,6 +26,7 @@ export function TimerTab({
         <h3 className="font-medium text-[#1a1a1a] mb-4">Timer</h3>
         <TimerCell
           clientId={projectId}
+          projectId={projectId}
           activeEntryId={activeTimerEntryId}
           activeStartedAt={activeTimerStartedAt}
           totalTrackedSeconds={totalTrackedSeconds}