fix: black BackInfo bg + wrong taskbar accent color

BackInfo.ini:
- AutoBackground=0: don't read live desktop color during deployment;
  Windows hasn't propagated the registry background color to the
  live session yet, so AutoBackground reads black
- BackgroundColor=4668194: explicit COLORREF for #223B47
  (was 2097152 = 0x200000 = RGB(0,0,32), near-black)

05-personalization.ps1:
- Add Explorer\Accent\AccentColorMenu = 0xFF473B22
- Add Explorer\Accent\StartColorMenu = 0xFF473B22
  Windows taskbar reads AccentColorMenu for its color when
  ColorPrevalence=1; DWM\AccentColor only controls title bars.
  Without these keys the taskbar shows Windows default blue
  (RGB 130, 232, 253 = Windows 11 "Steel" default accent).

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

assets/Backinfo/BackInfo.ini

@@ -56,8 +56,11 @@
 ;;
 
 [General]
-BackgroundColor = 2097152
+; #223B47 in COLORREF (0x00BBGGRR): R=34 G=59 B=71 = 71*65536 + 59*256 + 34 = 4668194
-AutoBackground = 1
+BackgroundColor = 4668194
+; AutoBackground=0: do NOT read live desktop color - unreliable during deployment
+; (live session may not yet reflect the registry background color change)
+AutoBackground = 0
 Output = %temp%\backinfo.bmp
 UpdateDesktop = 1
 LineSpacing = 2

scripts/05-personalization.ps1

@@ -94,6 +94,17 @@ function Apply-ThemeSettings {
     Set-Reg -Path "$HiveRoot\Software\Microsoft\Windows\DWM" `
             -Name "ColorPrevalence" -Value 1
 
+    # -----------------------------------------------------------------------
+    # Accent color for taskbar
+    # Windows taskbar reads AccentColorMenu from Explorer\Accent, NOT DWM\AccentColor.
+    # Without this key the taskbar keeps the Windows default accent (light blue).
+    # -----------------------------------------------------------------------
+    Set-Reg -Path "$HiveRoot\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent" `
+            -Name "AccentColorMenu" -Value $AccentColorABGR -Type "DWord"
+
+    Set-Reg -Path "$HiveRoot\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent" `
+            -Name "StartColorMenu" -Value $AccentColorABGR -Type "DWord"
+
     # -----------------------------------------------------------------------
     # Wallpaper - solid color #223B47 (fallback before DesktopInfo runs)
     # -----------------------------------------------------------------------