feat: add the admin layout shell

config/reference.php

@@ -1470,6 +1470,26 @@ use Symfony\Component\Config\Loader\ParamConfigurator as Param;
  *     generate_final_classes?: bool|Param, // Default: true
  *     generate_final_entities?: bool|Param, // Default: false
  * }
+ * @psalm-type UxIconsConfig = array{
+ *     icon_dir?: scalar|Param|null, // The local directory where icons are stored. // Default: "%kernel.project_dir%/assets/icons"
+ *     default_icon_attributes?: array<string, scalar|Param|null>,
+ *     icon_sets?: array<string, array{ // the icon set prefix (e.g. "acme") // Default: []
+ *         path?: scalar|Param|null, // The local icon set directory path. (cannot be used with 'alias')
+ *         alias?: scalar|Param|null, // The remote icon set identifier. (cannot be used with 'path')
+ *         icon_attributes?: array<string, scalar|Param|null>,
+ *         suffixes?: array<string, array{ // The suffix name (e.g. "solid", "20-solid") // Default: []
+ *             icon_attributes?: array<string, scalar|Param|null>,
+ *         }>,
+ *     }>,
+ *     aliases?: array<string, string|Param>,
+ *     iconify?: bool|array{ // Configuration for the remote icon service.
+ *         enabled?: bool|Param, // Default: true
+ *         on_demand?: bool|Param, // Whether to download icons "on demand". // Default: true
+ *         auto_lock?: bool|Param, // Persist "on demand" icons to the local icon directory (see "icon_dir"). Recommended in dev only. Requires "on_demand" to be enabled. // Default: false
+ *         endpoint?: scalar|Param|null, // The endpoint for the Iconify icons API. // Default: "https://api.iconify.design"
+ *     },
+ *     ignore_not_found?: bool|Param, // Ignore error when an icon is not found. Set to 'true' to fail silently. // Default: false
+ * }
  * @psalm-type ConfigType = array{
  *     imports?: ImportsConfig,
  *     parameters?: ParametersConfig,
@@ -1482,6 +1502,7 @@ use Symfony\Component\Config\Loader\ParamConfigurator as Param;
  *     twig_extra?: TwigExtraConfig,
  *     security?: SecurityConfig,
  *     monolog?: MonologConfig,
+ *     ux_icons?: UxIconsConfig,
  *     "when@dev"?: array{
  *         imports?: ImportsConfig,
  *         parameters?: ParametersConfig,
@@ -1497,6 +1518,7 @@ use Symfony\Component\Config\Loader\ParamConfigurator as Param;
  *         security?: SecurityConfig,
  *         monolog?: MonologConfig,
  *         maker?: MakerConfig,
+ *         ux_icons?: UxIconsConfig,
  *     },
  *     "when@prod"?: array{
  *         imports?: ImportsConfig,
@@ -1510,6 +1532,7 @@ use Symfony\Component\Config\Loader\ParamConfigurator as Param;
  *         twig_extra?: TwigExtraConfig,
  *         security?: SecurityConfig,
  *         monolog?: MonologConfig,
+ *         ux_icons?: UxIconsConfig,
  *     },
  *     "when@test"?: array{
  *         imports?: ImportsConfig,
@@ -1524,6 +1547,7 @@ use Symfony\Component\Config\Loader\ParamConfigurator as Param;
  *         twig_extra?: TwigExtraConfig,
  *         security?: SecurityConfig,
  *         monolog?: MonologConfig,
+ *         ux_icons?: UxIconsConfig,
  *     },
  *     ...<string, ExtensionType|array{ // extra keys must follow the when@%env% pattern or match an extension alias
  *         imports?: ImportsConfig,