feat: add main features

Agents for developpement added + frontend add + backend added. Git viewer created + agent and template creator + layout and project creator

frontend/src/shared/lib/cn.test.ts

@@ -0,0 +1,23 @@
+import { describe, it, expect } from "vitest";
+
+import { cn } from "./cn";
+
+describe("cn", () => {
+  it("joins truthy fragments with single spaces", () => {
+    expect(cn("a", "b", "c")).toBe("a b c");
+  });
+
+  it("drops falsy fragments", () => {
+    expect(cn("a", false, null, undefined, "", "b")).toBe("a b");
+  });
+
+  it("supports conditional fragments", () => {
+    const active = true;
+    const disabled = false;
+    expect(cn("base", active && "on", disabled && "off")).toBe("base on");
+  });
+
+  it("returns an empty string when everything is falsy", () => {
+    expect(cn(false, null, undefined)).toBe("");
+  });
+});

frontend/src/shared/lib/cn.ts

@@ -0,0 +1,16 @@
+/**
+ * `cn` — minimal className combiner for the design system.
+ *
+ * Joins truthy class fragments with a single space, dropping `false`,
+ * `null`, `undefined` and empty strings. Deliberately dependency-free (no
+ * `clsx`/`tailwind-merge`): the kit composes a small, controlled set of
+ * classes, and conditional fragments cover every call site.
+ *
+ * @example
+ * cn("px-2", isActive && "bg-primary", disabled && "opacity-50")
+ */
+export type ClassValue = string | false | null | undefined;
+
+export function cn(...parts: ClassValue[]): string {
+  return parts.filter(Boolean).join(" ");
+}