fix: apply Antergos NeXT wallpaper in live environment

The wallpaper autostart script was failing on Plasma 6 + Wayland,
causing the live session to show the default Plasma background instead
of the Antergos NeXT branded wallpaper.

Changes:
- Rewrote set-antergos-wallpaper.sh with three fallback methods:
  1. plasma-apply-wallpaperimage (primary)
  2. kwriteconfig6 + qdbus6 config reload
  3. qdbus6 evaluateScript API
- Added direct wallpaper config in live-overlay/home/antergos/ for
  the live user (most reliable, runs before Plasma starts)
- Updated existing /etc/skel/ and main.xml defaults to use
  antergos-wallpaper.png instead of adwaita-morning.webp
- Downloaded and included original Antergos wallpaper from the
  project's wallpapers repo

iso-profiles/antergos/live-overlay/etc/skel/.config/plasma-org.kde.plasma.desktop-appletsrc

@@ -7,5 +7,5 @@ plugin=org.kde.plasma.folder
 wallpaperplugin=org.kde.image
 
 [Containments][1][Wallpaper][org.kde.image][General]
-Image=file:///usr/share/wallpapers/antergos-wallpaper/contents/images/adwaita-morning.webp
+Image=file:///usr/share/wallpapers/antergos-wallpaper/contents/images/antergos-wallpaper.png
 FillMode=2

iso-profiles/antergos/live-overlay/home/antergos/.config/plasma-org.kde.plasma.desktop-appletsrc

@@ -0,0 +1,11 @@
+[Containments][1]
+activity=
+formfactor=0
+lastScreen=0
+location=0
+plugin=org.kde.plasma.folder
+wallpaperplugin=org.kde.image
+
+[Containments][1][Wallpaper][org.kde.image][General]
+Image=file:///usr/share/wallpapers/antergos-wallpaper/contents/images/antergos-wallpaper.png
+FillMode=2

iso-profiles/antergos/root-overlay/usr/local/bin/set-antergos-wallpaper.sh

@@ -1,10 +1,11 @@
 #!/usr/bin/env bash
 # One-shot wallpaper setter for Antergos NeXT
 # Runs at first login via autostart, then disables itself
+# Uses multiple fallback methods for Plasma 6 + Wayland compatibility
 
 LOG="/tmp/antergos-wallpaper.log"
 MARKER="$HOME/.config/antergos-wallpaper-set"
-WALLPAPER="/usr/share/wallpapers/antergos-wallpaper/contents/images/adwaita-morning.webp"
+WALLPAPER="/usr/share/wallpapers/antergos-wallpaper/contents/images/antergos-wallpaper.png"
 
 echo "[$(date)] Starting" > "$LOG"
 
@@ -22,22 +23,46 @@ fi
 
 echo "[$(date)] Wallpaper found, applying..." >> "$LOG"
 
-echo "[$(date)] Applying wallpaper..." >> "$LOG"
+# Method 1: plasma-apply-wallpaperimage (primary, works on Plasma 6)
+echo "[$(date)] Method 1: plasma-apply-wallpaperimage..." >> "$LOG"
 /usr/bin/plasma-apply-wallpaperimage "$WALLPAPER" >> "$LOG" 2>&1
 RC=$?
-echo "[$(date)] plasma-apply-wallpaperimage exit code: $RC" >> "$LOG"
+echo "[$(date)] Method 1 exit code: $RC" >> "$LOG"
 
 if [[ $RC -ne 0 ]]; then
-  echo "[$(date)] Falling back to qdbus script..." >> "$LOG"
-  qdbus org.kde.plasmashell /PlasmaShell org.kde.PlasmaShell.evaluateScript "
-    desktops().forEach(function(d) {
-      d.currentConfigGroup = ['Wallpaper', 'org.kde.image', 'General'];
-      d.writeConfig('Image', 'file://${WALLPAPER}');
-      d.reloadConfig();
-    });
-  " >> "$LOG" 2>&1
-  FALLBACK_RC=$?
-  echo "[$(date)] qdbus fallback exit code: $FALLBACK_RC" >> "$LOG"
+  # Method 2: kwriteconfig6 + qdbus6 config reload
+  echo "[$(date)] Method 2: kwriteconfig6 + qdbus6..." >> "$LOG"
+  CONFIG="$HOME/.config/plasma-org.kde.plasma.desktop-appletsrc"
+  if [[ -f "$CONFIG" ]]; then
+    kwriteconfig6 --file "$CONFIG" \
+      --group "Containments" --group "1" \
+      --group "Wallpaper" --group "org.kde.image" --group "General" \
+      --key "Image" "file://${WALLPAPER}" >> "$LOG" 2>&1
+    kwriteconfig6 --file "$CONFIG" \
+      --group "Containments" --group "1" \
+      --group "Wallpaper" --group "org.kde.image" --group "General" \
+      --key "FillMode" "2" >> "$LOG" 2>&1
+    qdbus6 org.kde.plasmashell /PlasmaShell org.kde.PlasmaShell.refreshCurrentShell >> "$LOG" 2>&1
+    RC2=$?
+    echo "[$(date)] Method 2 exit code: $RC2" >> "$LOG"
+  else
+    echo "[$(date)] Config not found at $CONFIG, skipping method 2" >> "$LOG"
+    RC2=1
+  fi
+
+  if [[ $RC2 -ne 0 ]]; then
+    # Method 3: qdbus6 evaluateScript (legacy API fallback)
+    echo "[$(date)] Method 3: qdbus6 evaluateScript..." >> "$LOG"
+    qdbus6 org.kde.plasmashell /PlasmaShell org.kde.PlasmaShell.evaluateScript "
+      desktops().forEach(function(d) {
+        d.currentConfigGroup = ['Wallpaper', 'org.kde.image', 'General'];
+        d.writeConfig('Image', 'file://${WALLPAPER}');
+        d.reloadConfig();
+      });
+    " >> "$LOG" 2>&1
+    RC3=$?
+    echo "[$(date)] Method 3 exit code: $RC3" >> "$LOG"
+  fi
 fi
 
 touch "$MARKER"

iso-profiles/antergos/root-overlay/usr/share/plasma/wallpapers/org.kde.image/contents/config/main.xml

@@ -26,7 +26,7 @@
         - if no fragment is specified, plasma will switch between dark and light
           images depending on the currently used color scheme
       </tooltip>
-      <default>file:///usr/share/wallpapers/antergos-wallpaper/contents/images/adwaita-morning.webp</default>
+      <default>file:///usr/share/wallpapers/antergos-wallpaper/contents/images/antergos-wallpaper.png</default>
     </entry>
     <entry name="PreviewImage" type="String">
       <label>Wallpaper preview image path</label>