Improve error handling and PWA manifest

core/enums.py

@@ -48,12 +48,15 @@ class Mode(str, Enum):
     def from_name(name):
         """Convert a string to an enum mode using the alias table."""
 
+        if not name:
+            return Mode.UNKNOWN
+
         try:
             return Mode(name.upper())
-        except ValueError:
+        except (KeyError, ValueError):
             try:
                 return Mode(MODE_ALIASES[name.upper()])
-            except ValueError:
+            except (KeyError, ValueError):
                 return Mode.UNKNOWN