AE2 Texture Updater

Added

• Run the update in the background: the config has a new "Run Mode" option. Keep "During Startup" for the old behaviour, or pick "In Background" to let the game finish loading first and do the texture update while you play
• The background run shows a small progress panel in the top-right corner with the current step and a progress bar, plus Cancel and Hide buttons. Hiding closes the panel but the run continues; cancelling stops it and clears the temporary files of that run (the cached GUI pack is kept)
• When the run finishes — completed or failed — a toast tells you the result, whether or not you hid the panel. Cancelling stays silent, since you asked for it
• Reload confirmation: replacing the texture pack makes the game unload and reload resources, so the mod now asks first instead of interrupting you. In a world the question arrives in chat with clickable [Continue] [Later] [Cancel]; on a menu it uses a normal screen. "Later" asks again after 5 minutes, "Cancel" stops the update

Fixed

• Cancelling an update then starting another one in the same session failed with a file error, because the list of mods to download was never regenerated. It is rebuilt now
• Replacing the texture pack while it was enabled failed on Windows with "another program is using this file"; the pack is now unloaded before writing and re-enabled afterwards, so the new textures also appear immediately without restarting