Restore complete wallpaper policies

tests/quickshell/settings-commit-reset-contract.sh

@@ -49,7 +49,7 @@ rg -Fq 'LockScreen.regenerate();' "$system_settings" \
     || fail 'restoreDefaults does not regenerate the shipped lock screen'
 rg -Fq 'const effectivePath = path === "" ? root.shippedPath : path;' "$wallpaper_service" \
     || fail 'clearing wallpaper preference leaves the old image visible'
-rg -Fq 'property string storedValue:' "$wallpaper_service" \
+rg -Fq 'storedPath: rawGlobal === root.shippedPath ? "" : rawGlobal' "$wallpaper_service" \
     || fail 'the shipped wallpaper cannot remain represented by the default empty preference'
 
 qs_for_harness() {
@@ -149,6 +149,11 @@ jq -e '.calls == [
 [[ "$(qs_for_harness ipc call settings-system-test stored dockHideDelayMs)" == "250" ]] \
     || fail 'reset did not restore a schema default'
 for default_case in \
+    'wallpaperMode|"single"' \
+    'wallpaperSlideshowPaths|[]' \
+    'wallpaperIntervalMinutes|30' \
+    'wallpaperShuffle|true' \
+    'wallpaperPerMonitor|{}' \
     'lockBackgroundMode|"screenshot"' \
     'lockBlurLevel|3' \
     'lockShowClock|true' \