feat: Visual CoPilot module + collapsible sidebar

- Add visual-copilot module (iframe embed, env: NEXT_PUBLIC_VIM_URL)
- Sidebar collapse to icon-only with localStorage persistence
- Tooltips on collapsed nav items
- Full-viewport layout for canvas routes (/visual-copilot)
- Register module in modules.ts + feature flag in flags.ts

src/modules/visual-copilot/components/visual-copilot-module.tsx

@@ -0,0 +1,62 @@
+"use client";
+
+import { ExternalLink, AlertTriangle, Maximize2 } from "lucide-react";
+import { useState } from "react";
+
+const VIM_URL = process.env.NEXT_PUBLIC_VIM_URL ?? "";
+
+export function VisualCopilotModule() {
+  const [isFullscreen, setIsFullscreen] = useState(false);
+
+  if (!VIM_URL) {
+    return (
+      <div className="flex h-full flex-col items-center justify-center gap-4 text-muted-foreground">
+        <AlertTriangle className="h-8 w-8 text-amber-500" />
+        <div className="text-center">
+          <p className="text-sm font-medium text-foreground">
+            Visual CoPilot nu este configurat
+          </p>
+          <p className="mt-1 text-xs">
+            Setează{" "}
+            <code className="rounded bg-muted px-1 py-0.5 text-xs">
+              NEXT_PUBLIC_VIM_URL
+            </code>{" "}
+            în fișierul .env
+          </p>
+        </div>
+      </div>
+    );
+  }
+
+  return (
+    <div className="relative h-full w-full">
+      <iframe
+        src={VIM_URL}
+        className="h-full w-full border-0"
+        title="Visual CoPilot"
+        allow="fullscreen"
+      />
+
+      {/* Floating action bar */}
+      <div className="absolute bottom-4 right-4 flex items-center gap-1.5">
+        <button
+          onClick={() => setIsFullscreen(!isFullscreen)}
+          className="flex items-center gap-1.5 rounded-md bg-background/80 px-2 py-1.5 text-xs text-muted-foreground backdrop-blur transition-colors hover:text-foreground"
+          title="Deschide fullscreen"
+        >
+          <Maximize2 className="h-3 w-3" />
+        </button>
+        <a
+          href={VIM_URL}
+          target="_blank"
+          rel="noopener noreferrer"
+          className="flex items-center gap-1.5 rounded-md bg-background/80 px-2 py-1.5 text-xs text-muted-foreground backdrop-blur transition-colors hover:text-foreground"
+          title="Deschide în tab nou"
+        >
+          <ExternalLink className="h-3 w-3" />
+          Tab nou
+        </a>
+      </div>
+    </div>
+  );
+}

src/modules/visual-copilot/config.ts

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+import type { ModuleConfig } from "@/core/module-registry/types";
+
+export const visualCopilotConfig: ModuleConfig = {
+  id: "visual-copilot",
+  name: "Visual CoPilot",
+  description:
+    "Canvas AI pentru vizualizare arhitecturală — generare imagini cu noduri conectate",
+  icon: "image",
+  route: "/visual-copilot",
+  category: "ai",
+  featureFlag: "module.visual-copilot",
+  visibility: "all",
+  version: "0.1.0",
+  dependencies: [],
+  storageNamespace: "visual-copilot",
+  navOrder: 52,
+  tags: ["ai", "imagine", "canvas", "arhitectura", "generare", "flux"],
+};

src/modules/visual-copilot/index.ts

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+export { VisualCopilotModule } from "./components/visual-copilot-module";
+export { visualCopilotConfig } from "./config";