feat(backup): page 2 pull-down triggers refresh instead of clean

Pull-to-refresh on page 2 reloads device storage and cleanup data, then
calls statusService.refresh. Pages 0 and 1 retain backup and clean actions
respectively.

Co-Authored-By: Kutesir <kutesir@provoc.ug>
Co-Authored-By: Sentry <sentry@provoc.ug>

App/NASBackupApp.swift

@@ -51,3 +51,4 @@ struct RootView: View {
         }
     }
 }
+

Features/Backup/BackupView.swift

@@ -708,8 +708,13 @@ struct BackupView: View {
     private var pullZone: some View {
         let pct   = min(pullProgress / 58, 1.0)
         let ready = pullProgress >= 58
-        let pullLabel    = ringPage == 0 ? "PULL TO BACK UP"    : "PULL TO CLEAN"
-        let releaseLabel = ringPage == 0 ? "RELEASE TO BACK UP" : "RELEASE TO CLEAN"
+        let pullLabel: String
+        let releaseLabel: String
+        switch ringPage {
+        case 0:  pullLabel = "PULL TO BACK UP";  releaseLabel = "RELEASE TO BACK UP"
+        case 1:  pullLabel = "PULL TO CLEAN";    releaseLabel = "RELEASE TO CLEAN"
+        default: pullLabel = "PULL TO REFRESH";  releaseLabel = "RELEASE TO REFRESH"
+        }
         return VStack(spacing: 3) {
             Text("↓")
                 .font(.system(size: 13))
@@ -825,7 +830,11 @@ struct BackupView: View {
                 withAnimation(.spring(response: 0.38, dampingFraction: 0.85)) { pullProgress = 0 }
                 if fired {
                     UIImpactFeedbackGenerator(style: .medium).impactOccurred()
-                    if ringPage == 0 { triggerBackupViaPull() } else { triggerCleanViaPull() }
+                    switch ringPage {
+                    case 0:  triggerBackupViaPull()
+                    case 1:  triggerCleanViaPull()
+                    default: triggerRefreshViaPull()
+                    }
                 }
             }
     }
@@ -836,6 +845,14 @@ struct BackupView: View {
         if engine.job.status == .paused { engine.resume() } else { startBackup() }
     }
 
+    private func triggerRefreshViaPull() {
+        rippleScale = 0.88; rippleOpacity = 0.4
+        withAnimation(.easeOut(duration: 0.65)) { rippleScale = 1.35; rippleOpacity = 0 }
+        loadDeviceStorage()
+        loadCleanupData()
+        statusService.refresh(force: true)
+    }
+
     private func triggerCleanViaPull() {
         rippleScale = 0.88; rippleOpacity = 0.6
         withAnimation(.easeOut(duration: 0.65)) { rippleScale = 1.35; rippleOpacity = 0 }