Track app assets

tools/build_app.py

@@ -2,8 +2,8 @@
 
     python tools/build_app.py [--art FOLDER]   -> dist/UnheardCity/ and dist/UnheardCity-<ver>-<os>.zip|.tar.gz
 
-One command does everything: artwork (app/assets, made from FOLDER - default ~/Downloads/Arkham City - when
-missing or older than tools/make_assets.py), PyInstaller bundle, THIRD_PARTY_LICENSES.txt, docs, archive.
+One command does everything: artwork (app/assets, committed; remade from ~/Downloads/Arkham City when missing,
+or from FOLDER with --art), PyInstaller bundle, THIRD_PARTY_LICENSES.txt, docs, archive.
 
 Requirements: the dev environment (`pip install -e .[app,dev]`). All native libraries come from the pinned
 PyPI wheels (Qt, libsndfile with libvorbis/FLAC/opus/mpg123, soxr); no external programs are bundled or
@@ -38,8 +38,7 @@ def main():
     assets = os.path.join(ROOT, "app", "assets")
     art = sys.argv[sys.argv.index("--art") + 1] if "--art" in sys.argv else None
     ico = os.path.join(assets, "app_icon.ico")
-    stale = not os.path.exists(ico) or os.path.getmtime(ico) < os.path.getmtime(os.path.join(ROOT, "tools", "make_assets.py"))
-    if art or stale:
+    if art or not os.path.exists(ico):
         import make_assets
         src = art or make_assets.DEFAULT_SRC
         if os.path.exists(os.path.join(src, "bac_logo_full.png")):