Better plugin scanning and RAR support!!!!!

• Add RAR archive import support.
• Add MO2 style “View Files” popup for installed mods.
• Add mod file preview sections for deployed/winning, overwritten, plugins, archives, config files, setup files, documentation, optional files, and unknown files.
• Add fullscreen toggle for mod file preview.
• Add plugin scanning from selected target Data folder.
• Add support for official/base game plugins when detected in the target Data folder.
• Add support for unmanaged plugins already present in the target Data folder.
• Add plugin source labels for Base Game, Official DLC, Managed Mod, and Unmanaged Data Folder.
• Lock detected official/base plugins so they cannot be disabled or moved accidentally.
• Update plugin export so generated plugins.txt/loadorder.txt can include detected base game, DLC, managed, and unmanaged plugins.
• Improve plugin manager behavior for users without all DLC installed by scanning actual files instead of blindly adding default plugins.
• Add experimental second-screen plugin display support for dual-screen devices like AYN Thor.
• Add toggle to enable/disable second-screen plugin display.
• Improve plugin list/debug visibility for external and manually installed plugins.