fix: atomic write on existing prefs path; Inkscape 1.x export flags; version check guard

install.sh

@@ -33,7 +33,8 @@ check_deps() {
     version=$(inkscape --version 2>/dev/null | grep -oP '\d+\.\d+' | head -1)
     local major minor
     IFS='.' read -r major minor <<< "$version"
-    if (( major < 1 )) || (( major == 1 && minor < 2 )); then
+    # Skip version check if regex couldn't match (non-standard version string)
+    if [[ -n "$major" ]] && { (( major < 1 )) || (( major == 1 && minor < 2 )); }; then
         echo "⚠ Inkscape $version detected. Illuscape targets Inkscape 1.2+."
         echo "  Some settings may not apply correctly. Continue anyway? [y/N]"
         [[ $AUTO_YES == 1 ]] || { read -r ans; [[ "$ans" =~ ^[Yy]$ ]] || exit 0; }
@@ -56,7 +57,7 @@ backup_config() {
     local backup_dir="${INKSCAPE_CONFIG}.bak-illuscape-$(date +%Y%m%d-%H%M%S)"
 
     # If any illuscape backup already exists, skip (idempotent)
-    if ls "${INKSCAPE_CONFIG}".bak-illuscape-* &>/dev/null 2>&1; then
+    if ls "${INKSCAPE_CONFIG}".bak-illuscape-* &>/dev/null; then
         echo "→ Backup already exists — skipping (idempotent)"
         return 0
     fi
@@ -139,8 +140,11 @@ install_desktop() {
                 -o "$icon_dir/illuscape.png" 2>/dev/null && continue
         fi
         if command -v inkscape &>/dev/null; then
-            inkscape "$icon_src" --export-png="$icon_dir/illuscape.png" \
+            # Inkscape 1.x uses --export-filename + --export-type (--export-png removed in 1.0)
-                --export-width="$size" --export-height="$size" 2>/dev/null && continue
+            inkscape --export-filename="$icon_dir/illuscape.png" \
+                --export-type=png \
+                --export-width="$size" --export-height="$size" \
+                "$icon_src" 2>/dev/null && continue
         fi
         echo "⚠ Could not rasterize icon at ${size}px (install rsvg-convert for icons)"
     done

scripts/merge_prefs.py

@@ -95,7 +95,7 @@ def merge(prefs_path: Path, patch_path: Path, preset: str) -> None:
     _merge_nodes(live_root, patch_root)
     _apply_preset(live_root, preset)
 
-    live_tree.write(str(prefs_path), encoding="unicode", xml_declaration=True)
+    _atomic_write(live_tree, prefs_path)
 
 
 def main() -> None: