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/TimerCell.tsx

@@ -2,7 +2,7 @@
 
 import { useState, useEffect, useTransition } from "react";
 import { useRouter } from "next/navigation";
-import { startTimerForClient, stopTimer } from "@/app/admin/timer-actions";
+import { startTimer, startTimerForClient, stopTimer } from "@/app/admin/timer-actions";
 
 function formatDuration(seconds: number): string {
   const h = Math.floor(seconds / 3600);
@@ -14,11 +14,13 @@ function formatDuration(seconds: number): string {
 
 export function TimerCell({
   clientId,
+  projectId,
   activeEntryId,
   activeStartedAt,
   totalTrackedSeconds,
 }: {
   clientId: string;
+  projectId?: string;
   activeEntryId: string | null;
   activeStartedAt: Date | null;
   totalTrackedSeconds: number;
@@ -46,6 +48,8 @@ export function TimerCell({
     startTransition(async () => {
       if (isRunning && activeEntryId) {
         await stopTimer(activeEntryId);
+      } else if (projectId) {
+        await startTimer(projectId);
       } else {
         await startTimerForClient(clientId);
       }