feat(dashboard): adiciona widgets movíveis e ocultáveis

- Cria SortableWidget com @dnd-kit para drag-and-drop
- Cria DashboardGridEditable com modo de edição
- Cria WidgetSettingsDialog para gerenciar visibilidade
- Cria server actions para persistir preferências

lib/dashboard/widgets/actions.ts

@@ -0,0 +1,87 @@
+"use server";
+
+import { getUser } from "@/lib/auth/server";
+import { db, schema } from "@/lib/db";
+import { eq } from "drizzle-orm";
+import { revalidatePath } from "next/cache";
+
+export type WidgetPreferences = {
+  order: string[];
+  hidden: string[];
+};
+
+export async function updateWidgetPreferences(
+  preferences: WidgetPreferences,
+): Promise<{ success: boolean; error?: string }> {
+  try {
+    const user = await getUser();
+
+    // Check if preferences exist
+    const existing = await db
+      .select({ id: schema.userPreferences.id })
+      .from(schema.userPreferences)
+      .where(eq(schema.userPreferences.userId, user.id))
+      .limit(1);
+
+    if (existing.length > 0) {
+      await db
+        .update(schema.userPreferences)
+        .set({
+          dashboardWidgets: preferences,
+          updatedAt: new Date(),
+        })
+        .where(eq(schema.userPreferences.userId, user.id));
+    } else {
+      await db.insert(schema.userPreferences).values({
+        userId: user.id,
+        dashboardWidgets: preferences,
+      });
+    }
+
+    revalidatePath("/dashboard");
+    return { success: true };
+  } catch (error) {
+    console.error("Error updating widget preferences:", error);
+    return { success: false, error: "Erro ao salvar preferências" };
+  }
+}
+
+export async function resetWidgetPreferences(): Promise<{
+  success: boolean;
+  error?: string;
+}> {
+  try {
+    const user = await getUser();
+
+    await db
+      .update(schema.userPreferences)
+      .set({
+        dashboardWidgets: null,
+        updatedAt: new Date(),
+      })
+      .where(eq(schema.userPreferences.userId, user.id));
+
+    revalidatePath("/dashboard");
+    return { success: true };
+  } catch (error) {
+    console.error("Error resetting widget preferences:", error);
+    return { success: false, error: "Erro ao resetar preferências" };
+  }
+}
+
+export async function getWidgetPreferences(): Promise<WidgetPreferences | null> {
+  try {
+    const user = await getUser();
+
+    const result = await db
+      .select({ dashboardWidgets: schema.userPreferences.dashboardWidgets })
+      .from(schema.userPreferences)
+      .where(eq(schema.userPreferences.userId, user.id))
+      .limit(1);
+
+    return result[0]?.dashboardWidgets ?? null;
+  } catch (error) {
+    console.error("Error getting widget preferences:", error);
+    return null;
+  }
+}