feat: permitir a admins personalizar header desde landing pública

- Nuevo endpoint POST /companies/check-admin para verificar rol de admin
- Componente HeaderEditPopup con color pickers e image picker
- Botón flotante de editar sobre el header cuando el usuario es admin
- Popup tipo drawer inferior con formulario de personalización
- Reutiliza APIs existentes: companies/update y companies/upload-header

server/src/api/Companies/Companies.Controller.ts

@@ -405,3 +405,24 @@ export class CheckCompanyNameController extends Controller {
         }
     }
 }
+
+@Route("companies/check-admin")
+@Middlewares(authenticateMiddleware)
+export class CheckCompanyAdminController extends Controller {
+    @Response<ApiValidationError>(500, "Ha ocurrido un error")
+    @SuccessResponse(200, "Done")
+    @Post()
+    public async checkAdmin(
+        @Body() requestBody: { companyId: string; sessionUser: string }
+    ): Promise<{ isAdmin: boolean } | ApiValidationError> {
+        try {
+            const isAdmin = await new CompaniesService().checkCompanyAdmin(requestBody);
+            this.setStatus(200);
+            return { isAdmin };
+        } catch (e) {
+            const errorOccurred: Error = e as Error;
+            this.setStatus(500);
+            return new ApiValidationError(500, errorOccurred.message);
+        }
+    }
+}

server/src/api/Companies/Companies.Service.ts

@@ -112,4 +112,9 @@ export class CompaniesService {
         const isValid = await CompaniestList.isValidName({ name });
         return isValid;
     }
+
+    public async checkCompanyAdmin(data: { companyId: string; sessionUser: string }): Promise<boolean> {
+        await connect(`${process.env.DATABASE_CONNECTION}`);
+        return await CompaniestList.checkCompanyAdmin(data);
+    }
 }