Add a page detailing the platform's technical workings and AI transparency

Adds a new "Fonctionnement" page and integrates it into the app's routing and navigation to explain the AI's role, data handling, and limitations.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: 923ae0e3-a363-4db8-b04a-e8baca2a1330
Replit-Commit-Checkpoint-Type: full_checkpoint
Replit-Commit-Event-Id: 26cc3ee2-cf8d-46e5-8c74-836cb5ae3a18
Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/8af7d2ec-2cc3-4ece-8af3-9f071488d072/923ae0e3-a363-4db8-b04a-e8baca2a1330/qrVKaka
Replit-Helium-Checkpoint-Created: true

artifacts/voix-du-peuple/src/App.tsx

@@ -5,6 +5,7 @@ import { TooltipProvider } from "@/components/ui/tooltip";
 import NotFound from "@/pages/not-found";
 import Home from "@/pages/home";
 import About from "@/pages/about";
+import Transparence from "@/pages/transparence";
 
 const queryClient = new QueryClient({
   defaultOptions: {
@@ -25,6 +26,7 @@ function Navbar() {
         <nav className="flex items-center gap-6 text-sm font-medium">
           <Link href="/" className="transition-colors hover:text-foreground/80 text-foreground/60" data-testid="nav-manifesto-link">Manifeste</Link>
           <Link href="/about" className="transition-colors hover:text-foreground/80 text-foreground/60" data-testid="nav-about-link">À propos</Link>
+          <Link href="/transparence" className="transition-colors hover:text-foreground/80 text-foreground/60" data-testid="nav-transparence-link">Fonctionnement</Link>
         </nav>
       </div>
     </header>
@@ -39,6 +41,7 @@ function Router() {
         <Switch>
           <Route path="/" component={Home} />
           <Route path="/about" component={About} />
+          <Route path="/transparence" component={Transparence} />
           <Route component={NotFound} />
         </Switch>
       </main>