Restore complete wallpaper policies

tests/quickshell/settings-backup-live-contract.sh

@@ -47,7 +47,7 @@ for mapping in \
     'Displays.externalChangeBlocked = blocked;' \
     'SystemSettings.applyPersistedDisplayPolicy();' \
     'Keybinds.applyReload();' \
-    'Wallpaper.set(path);' \
+    'Wallpaper.applyCurrentPolicy(false);' \
     'LockScreen.regenerate();' \
     'Quickshell.reload(false);'; do
     rg -Fq "$mapping" "$service" || fail "production restore seam is missing: $mapping"
@@ -88,7 +88,7 @@ jq -e '
         "display.protect:{\"DP-2\":{\"mode\":\"4500x3000@60\",\"scale\":1.5,\"transform\":0}}",
         "system.apply",
         "keybinds.reload",
-        "wallpaper.set:/tmp/restored-wallpaper.jpg",
+        "wallpaper.apply-policy",
         "lock.regenerate",
         "display.block:false",
         "shell.reload"
@@ -127,7 +127,7 @@ jq -e '
         "display.protect:{\"DP-2\":{\"mode\":\"4500x3000@60\",\"scale\":1.5,\"transform\":0}}",
         "system.apply",
         "keybinds.reload",
-        "wallpaper.set:/tmp/restored-wallpaper.jpg",
+        "wallpaper.apply-policy",
         "lock.regenerate",
         "display.block:false",
         "shell.reload"

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' \