[client] UI refactor (#6069)

Refactor UI

---------

Co-authored-by: Eduard Gert <kontakt@eduardgert.de>
Co-authored-by: braginini <bangvalo@gmail.com>
Co-authored-by: Pascal Fischer <32096965+pascal-fischer@users.noreply.github.com>
Co-authored-by: Claude <noreply@anthropic.com>
Co-authored-by: riccardom <riccardomanfrin@gmail.com>

client/mdm/canonical_loaders.go

@@ -15,6 +15,7 @@ var allKeys = []string{
 	KeyDisableUpdateSettings,
 	KeyDisableProfiles,
 	KeyDisableNetworks,
+	KeyDisableAdvancedView,
 	KeyDisableClientRoutes,
 	KeyDisableServerRoutes,
 	KeyBlockInbound,

client/mdm/policy.go

@@ -23,6 +23,13 @@ const (
 	KeyDisableUpdateSettings    = "disableUpdateSettings"
 	KeyDisableProfiles          = "disableProfiles"
 	KeyDisableNetworks          = "disableNetworks"
+	// KeyDisableAdvancedView gates the advanced-view section in the
+	// upcoming UI revision. UI-only: NOT stored on Config, not
+	// applied by applyMDMPolicy, not rejectable via SetConfig. The
+	// daemon surfaces it through GetFeatures (tristate: present
+	// true / present false / absent) and the same key appears in
+	// GetConfigResponse.mDMManagedFields when set.
+	KeyDisableAdvancedView      = "disableAdvancedView"
 	KeyDisableClientRoutes      = "disableClientRoutes"
 	KeyDisableServerRoutes      = "disableServerRoutes"
 	KeyBlockInbound             = "blockInbound"