feat: add support for Flatpak launcher.ini paths and introduce is_interactive helper to handle non-interactive environments correctly

wrapper.py

@@ -138,18 +138,25 @@ def send_otp(secret):
     print("Timed out waiting for XIVLauncher OTP prompt.")
 
 def check_and_update_launcher_ini():
-    """Checks ~/.xlcore/launcher.ini for IsOtpServer setting.
+    """Checks launcher.ini for IsOtpServer setting.
     
     If file is missing: prompts user to enable it manually in launcher.
     If file exists but setting is off: prompts user to auto-enable it.
     """
-    ini_path = os.path.expanduser("~/.xlcore/launcher.ini")
+    native_ini = os.path.expanduser("~/.xlcore/launcher.ini")
+    flatpak_ini = os.path.expanduser("~/.var/app/dev.goats.xivlauncher/data/xivlauncher/launcher.ini")
     
-    if not os.path.exists(ini_path):
-        print(f"\nConfiguration Check: '{ini_path}' not found.")
+    ini_path = None
+    if os.path.exists(native_ini):
+        ini_path = native_ini
+    elif os.path.exists(flatpak_ini):
+        ini_path = flatpak_ini
+        
+    if not ini_path:
+        print(f"\nConfiguration Check: Could not find launcher.ini (checked ~/.xlcore and flatpak paths).")
         print("Please open XIVLauncher, go to Settings, and enable 'Start internal OTP server'.")
         print("This is required for the wrapper to function.")
-        if sys.stdin.isatty():
+        if is_interactive():
             try:
                 input("Press Enter to continue once you have done this (or to try anyway)...")
             except EOFError:
@@ -179,7 +186,7 @@ def check_and_update_launcher_ini():
     print("XIVLauncher requires 'IsOtpServer' to be enabled to accept OTP codes from this wrapper.")
     
     choice = 'n'
-    if sys.stdin.isatty():
+    if is_interactive():
         try:
             choice = input("Enable 'IsOtpServer' now? [Y/n]: ").strip().lower()
         except EOFError:
@@ -247,6 +254,10 @@ def is_steam_env():
         return True
     return False
 
+def is_interactive():
+    """Checks if we are in a truly interactive terminal session (not running under Steam)."""
+    return sys.stdin.isatty() and not is_steam_env()
+
 def get_secret(config, config_path, allow_prompt=True):
     """
     Retrieves the OTP secret in the following priority:
@@ -306,7 +317,7 @@ def get_secret(config, config_path, allow_prompt=True):
     
     if not secret_input:
         print("GUI prompt unavailable or cancelled. Falling back to CLI.")
-        if not sys.stdin.isatty():
+        if not is_interactive():
             print("Error: No interactive terminal available and GUI prompt failed. Cannot prompt for secret.")
             return None
             
@@ -482,7 +493,7 @@ def main():
                     print(f"\n'{gamemode_cmd}' was detected on your system.")
                     print("Would you like to enable it for XIVLauncher? This can improve game performance.")
                     try:
-                        if sys.stdin.isatty():
+                        if is_interactive():
                             choice = input(f"Enable {gamemode_cmd}? [Y/n]: ").strip().lower()
                         else:
                             choice = 'y' # auto-enable if not interactive