diff --git a/controller/app/src/main/java/org/iiab/controller/DashboardFragment.java b/controller/app/src/main/java/org/iiab/controller/DashboardFragment.java
index 9cb1663ca..29c30724c 100644
--- a/controller/app/src/main/java/org/iiab/controller/DashboardFragment.java
+++ b/controller/app/src/main/java/org/iiab/controller/DashboardFragment.java
@@ -96,10 +96,8 @@ private static class IiabModule {
             new IiabModule("dashboard", R.string.dash_system, false)
     );
 
-    public enum SystemState {
-        ONLINE, OFFLINE, DEBIAN_ONLY, INSTALLER, TERMUX_ONLY, NONE
-    }
-
+    // ADFA-5192: SystemState is now a top-level enum (org.iiab.controller.SystemState),
+    // extracted so it survives the retirement of this legacy fragment.
     private SystemState currentSystemState = SystemState.NONE;
 
     @Nullable
diff --git a/controller/app/src/main/java/org/iiab/controller/ServerController.java b/controller/app/src/main/java/org/iiab/controller/ServerController.java
index c5b3cc025..c74c6ca9d 100644
--- a/controller/app/src/main/java/org/iiab/controller/ServerController.java
+++ b/controller/app/src/main/java/org/iiab/controller/ServerController.java
@@ -155,7 +155,7 @@ private void checkServerStatus() {
 
             // ADFA-4578: evaluate + publish the SystemState at app level (every poll),
             // so every tab reflects the server live instead of only after visiting the Dashboard.
-            final DashboardFragment.SystemState sysState = SystemStateEvaluator.evaluate(activity, localAlive);
+            final SystemState sysState = SystemStateEvaluator.evaluate(activity, localAlive);
             ServerStateRepository.get().post(ServerState.of(localAlive, sysState));
 
             // STATE MACHINE: Has the target state been reached?
diff --git a/controller/app/src/main/java/org/iiab/controller/ServerState.java b/controller/app/src/main/java/org/iiab/controller/ServerState.java
index eeb7d3eb9..7282f3bc5 100644
--- a/controller/app/src/main/java/org/iiab/controller/ServerState.java
+++ b/controller/app/src/main/java/org/iiab/controller/ServerState.java
@@ -14,18 +14,18 @@
 public final class ServerState {
 
     public final boolean alive;
-    public final DashboardFragment.SystemState systemState;
+    public final SystemState systemState;
 
-    private ServerState(boolean alive, DashboardFragment.SystemState systemState) {
+    private ServerState(boolean alive, SystemState systemState) {
         this.alive = alive;
         this.systemState = systemState;
     }
 
-    public static ServerState of(boolean alive, DashboardFragment.SystemState systemState) {
+    public static ServerState of(boolean alive, SystemState systemState) {
         return new ServerState(alive, systemState);
     }
 
     public static ServerState unknown() {
-        return new ServerState(false, DashboardFragment.SystemState.NONE);
+        return new ServerState(false, SystemState.NONE);
     }
 }
diff --git a/controller/app/src/main/java/org/iiab/controller/SystemState.java b/controller/app/src/main/java/org/iiab/controller/SystemState.java
new file mode 100644
index 000000000..594212c33
--- /dev/null
+++ b/controller/app/src/main/java/org/iiab/controller/SystemState.java
@@ -0,0 +1,18 @@
+/*
+ * ============================================================================
+ * Name        : SystemState.java
+ * Author      : AppDevForAll
+ * Copyright   : Copyright (c) 2026 AppDevForAll
+ * Description : ADFA-5192. The derived state of the on-device system, evaluated from
+ *               the rootfs/Debian/server facts (see SystemStateEvaluator) and published
+ *               on ServerState so any surface can observe it live. Extracted from the
+ *               legacy DashboardFragment (where it began as a nested enum) so it survives
+ *               the retirement of the legacy tabbed UI; the redesign reads it through
+ *               ServerState / ServerStateRepository.
+ * ============================================================================
+ */
+package org.iiab.controller;
+
+public enum SystemState {
+    ONLINE, OFFLINE, DEBIAN_ONLY, INSTALLER, TERMUX_ONLY, NONE
+}
diff --git a/controller/app/src/main/java/org/iiab/controller/SystemStateEvaluator.java b/controller/app/src/main/java/org/iiab/controller/SystemStateEvaluator.java
index 7377edb55..4589b08fa 100644
--- a/controller/app/src/main/java/org/iiab/controller/SystemStateEvaluator.java
+++ b/controller/app/src/main/java/org/iiab/controller/SystemStateEvaluator.java
@@ -65,21 +65,21 @@ public static boolean rootfsPresent(Context ctx) {
     }
 
     /** Server responding → ONLINE; else derive from the rootfs on disk. */
-    public static DashboardFragment.SystemState evaluate(Context ctx, boolean serverAlive) {
+    public static SystemState evaluate(Context ctx, boolean serverAlive) {
         File rootfsDir = rootfsDir(ctx);
         File debianBash = new File(rootfsDir, "bin/bash");
         File flagIiabReady = new File(rootfsDir, "usr/local/pdsm/flag_install_ready");
 
         if (serverAlive) {
-            return DashboardFragment.SystemState.ONLINE;
+            return SystemState.ONLINE;
         }
         if (flagIiabReady.exists()) {
-            return DashboardFragment.SystemState.OFFLINE;
+            return SystemState.OFFLINE;
         }
         if (debianBash.exists()) {
-            return DashboardFragment.SystemState.DEBIAN_ONLY;
+            return SystemState.DEBIAN_ONLY;
         }
-        return DashboardFragment.SystemState.NONE;
+        return SystemState.NONE;
     }
 
     public static String termuxArch(Context ctx) {
diff --git a/controller/app/src/main/java/org/iiab/controller/UsageFragment.java b/controller/app/src/main/java/org/iiab/controller/UsageFragment.java
index b6c18cafc..0bf9fb87f 100644
--- a/controller/app/src/main/java/org/iiab/controller/UsageFragment.java
+++ b/controller/app/src/main/java/org/iiab/controller/UsageFragment.java
@@ -184,8 +184,8 @@ public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceStat
 
         btnServerControl.setOnClickListener(v -> {
             // --- Intercept based on State Machine ---
-            DashboardFragment.SystemState state = ServerStateRepository.get().current().systemState;
-            boolean isFullyInstalled = (state == DashboardFragment.SystemState.ONLINE || state == DashboardFragment.SystemState.OFFLINE);
+            SystemState state = ServerStateRepository.get().current().systemState;
+            boolean isFullyInstalled = (state == SystemState.ONLINE || state == SystemState.OFFLINE);
 
             if (!isFullyInstalled) {
                 Snackbar.make(v, R.string.server_not_installed_warning, 6000).show();
@@ -259,8 +259,8 @@ public void updateUIColorsAndVisibility() {
         }
 
         // Server Control Logic
-        DashboardFragment.SystemState state = ServerStateRepository.get().current().systemState;
-        boolean isFullyInstalled = (state == DashboardFragment.SystemState.ONLINE || state == DashboardFragment.SystemState.OFFLINE);
+        SystemState state = ServerStateRepository.get().current().systemState;
+        boolean isFullyInstalled = (state == SystemState.ONLINE || state == SystemState.OFFLINE);
 
         if (!isFullyInstalled) {
             // SYSTEM NOT READY: Gray out the button
diff --git a/controller/app/src/main/java/org/iiab/controller/help/domain/Tier3LinkResolver.java b/controller/app/src/main/java/org/iiab/controller/help/domain/Tier3LinkResolver.java
index 27fdfe13d..55d19b8dd 100644
--- a/controller/app/src/main/java/org/iiab/controller/help/domain/Tier3LinkResolver.java
+++ b/controller/app/src/main/java/org/iiab/controller/help/domain/Tier3LinkResolver.java
@@ -12,7 +12,7 @@
  * Resolves a tier-3 help link's {@link Tier3LinkState} from the two facts that matter:
  * whether a usable IIAB rootfs is present, and whether the local web server is alive.
  *
- * <p>Presentation maps {@code DashboardFragment.SystemState} to {@code rootfsPresent}
+ * <p>Presentation maps {@code SystemState} to {@code rootfsPresent}
  * (ONLINE/OFFLINE = true; NONE/DEBIAN_ONLY/TERMUX_ONLY/INSTALLER = false) and reads
  * {@code alive} from {@code ServerState}. Kept UI-agnostic so it is JVM-unit-testable.
  */