Add time clock feature with MCP access

- New beenvoice_time_entry DB table with migration (startedAt/endedAt, hours, rate, clientId)
- tRPC router with clockIn, clockOut, getRunning, getAll, getSummary, create, update, delete
- Dashboard page at /dashboard/time-clock with live elapsed timer, entry list, and manual entry form
- 5 MCP tools: time_clock_in, time_clock_out, time_get_running, time_entries_list, time_entries_create
- Sidebar navigation entry

Timer state is stored in PostgreSQL (endedAt IS NULL = running), suitable for serverless/Coolify deployment.

src/lib/navigation.ts

@@ -8,6 +8,7 @@ import {
   BarChart2,
   Shield,
   RefreshCw,
+  Clock,
 } from "lucide-react";
 
 export interface NavLink {
@@ -31,6 +32,7 @@ export const navigationConfig: NavSection[] = [
       { name: "Invoices", href: "/dashboard/invoices", icon: FileText },
       { name: "Recurring", href: "/dashboard/invoices/recurring", icon: RefreshCw },
       { name: "Expenses", href: "/dashboard/expenses", icon: Receipt },
+      { name: "Time Clock", href: "/dashboard/time-clock", icon: Clock },
       { name: "Reports", href: "/dashboard/reports", icon: BarChart2 },
     ],
   },