Fix search box and systray for Win10/Win11 compatibility

- Add Search subkey for Win10 search box hiding
- Clear TrayNotify icon streams as Win11 systray workaround
- Restart Explorer to apply taskbar changes in current session

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

scripts/04-default-profile.ps1

@@ -131,7 +131,10 @@ try {
     # Win11: align taskbar to left (0 = left, 1 = center)
     Set-ProfileReg -SubKey $tbPath -Name "TaskbarAl" -Value 0
 
-    # Hide Search box / button (0 = hidden, 1 = icon, 2 = full box)
+    # Hide Search box / button - Win10/11 (0 = hidden, 1 = icon, 2 = full box)
+    # Note: Win11 uses Search subkey, Win10 uses Explorer\Advanced - set both
+    Set-ProfileReg -SubKey "Software\Microsoft\Windows\CurrentVersion\Search" `
+                   -Name "SearchboxTaskbarMode" -Value 0
     Set-ProfileReg -SubKey $tbPath -Name "SearchboxTaskbarMode" -Value 0
 
     # Hide Task View button
@@ -155,9 +158,27 @@ try {
     # -----------------------------------------------------------------------
     # System tray - show all icons
     # -----------------------------------------------------------------------
+    # EnableAutoTray = 0 works on Win10; Win11 ignores it but set anyway
     Set-ProfileReg -SubKey "Software\Microsoft\Windows\CurrentVersion\Explorer" `
                    -Name "EnableAutoTray" -Value 0
 
+    # Win11 workaround: clear cached tray icon streams so all icons appear on next login
+    # Windows rebuilds the streams with all icons visible when no cache exists
+    $trayNotifyKey = "HKCU:\Software\Classes\Local Settings\Software\Microsoft\Windows\CurrentVersion\TrayNotify"
+    if (Test-Path $trayNotifyKey) {
+        Remove-ItemProperty -Path $trayNotifyKey -Name "IconStreams"     -Force -ErrorAction SilentlyContinue
+        Remove-ItemProperty -Path $trayNotifyKey -Name "PastIconsStream" -Force -ErrorAction SilentlyContinue
+        Write-Log "  Cleared TrayNotify icon streams (Win11 systray workaround)" -Level OK
+    }
+
+    # Also clear in Default hive so new users start with clean state
+    $defTrayKey = "Registry::HKU\DefaultProfile\Software\Classes\Local Settings\Software\Microsoft\Windows\CurrentVersion\TrayNotify"
+    if (Test-Path $defTrayKey) {
+        Remove-ItemProperty -Path $defTrayKey -Name "IconStreams"     -Force -ErrorAction SilentlyContinue
+        Remove-ItemProperty -Path $defTrayKey -Name "PastIconsStream" -Force -ErrorAction SilentlyContinue
+        Write-Log "  Cleared TrayNotify icon streams in Default hive" -Level OK
+    }
+
     # -----------------------------------------------------------------------
     # Desktop icons - show This PC
     # -----------------------------------------------------------------------
@@ -286,4 +307,18 @@ finally {
     }
 }
 
+# -----------------------------------------------------------------------
+# Restart Explorer to apply taskbar/tray changes to current session
+# -----------------------------------------------------------------------
+Write-Log "Restarting Explorer to apply taskbar changes" -Level INFO
+try {
+    Stop-Process -Name explorer -Force -ErrorAction SilentlyContinue
+    Start-Sleep -Seconds 2
+    Start-Process explorer
+    Write-Log "Explorer restarted" -Level OK
+}
+catch {
+    Write-Log "Explorer restart failed (non-fatal): $_" -Level WARN
+}
+
 Write-Log "Step 4 complete" -Level OK