Close desktop safety gaps

config/dot/quickshell/scripts/panama-lock

@@ -17,8 +17,10 @@ status_file="$state_dir/hyprlock-status.json"
 fallback="$config_home/hypr/hyprlock.conf"
 temporary="$generated.tmp.$$"
 status_temporary="$status_file.tmp.$$"
+shipped_wallpaper="$HOME/Pictures/Wallpapers/faroe_islands.jpg"
 
 settings_valid=false
+wallpaper_warning=""
 
 cleanup() {
     rm -f "$temporary" "$status_temporary" 2>/dev/null || true
@@ -76,7 +78,23 @@ read_object() {
 }
 
 valid_path() {
-    [[ "$1" == /* && "$1" != *","* && "$1" != *$'\n'* ]]
+    [[ "$1" == /* && "$1" != *","* && "$1" != *$'\n'* && -f "$1" && -r "$1" ]]
+}
+
+resolve_wallpaper_path() {
+    local candidate="$1"
+    if valid_path "$candidate"; then
+        resolved_wallpaper="$candidate"
+        return
+    fi
+    if [[ -n "$candidate" ]]; then
+        wallpaper_warning="One or more lock-screen wallpapers were unavailable; a safe fallback is in use."
+    fi
+    if valid_path "$shipped_wallpaper"; then
+        resolved_wallpaper="$shipped_wallpaper"
+    else
+        resolved_wallpaper="screenshot"
+    fi
 }
 
 # Same 8 named accents as config/Theme.qml's `accents` map (kept in sync by
@@ -134,10 +152,9 @@ load_preferences() {
     wallpaper_mode="$(read_string wallpaperMode single)"
     [[ "$wallpaper_mode" == single || "$wallpaper_mode" == slideshow || "$wallpaper_mode" == per-monitor ]] \
         || wallpaper_mode=single
-    wallpaper_path="$(read_string wallpaperPath '')"
-    if ! valid_path "$wallpaper_path"; then
-        wallpaper_path="$HOME/Pictures/Wallpapers/faroe_islands.jpg"
-    fi
+    wallpaper_warning=""
+    resolve_wallpaper_path "$(read_string wallpaperPath '')"
+    wallpaper_path="$resolved_wallpaper"
     wallpaper_assignments="$(read_object wallpaperPerMonitor)"
 
     case "$blur_level" in
@@ -218,8 +235,9 @@ emit_backgrounds() {
                     candidate="$(jq -r --arg output "$output" \
                         'if has($output) and (.[$output] | type) == "string" then .[$output] else "" end' \
                         <<<"$wallpaper_assignments" 2>/dev/null || true)"
-                    if valid_path "$candidate"; then
-                        assigned="$candidate"
+                    if [[ -n "$candidate" ]]; then
+                        resolve_wallpaper_path "$candidate"
+                        assigned="$resolved_wallpaper"
                     fi
                 fi
                 emit_background "$output" "$assigned"
@@ -344,7 +362,7 @@ generate() {
         write_status false "$fallback" true "The lock-screen configuration could not be generated."
         return 1
     fi
-    write_status true "$generated" false ""
+    write_status true "$generated" false "$wallpaper_warning"
 }
 
 status() {