Added some fixes

[YacaloX]

Fixes

• Improved window focus reliability using SwitchToThisWindow and AttachThreadInput.
• Fixed hotkey re-registration issues.
• Fixed theme updates not refreshing dynamically.
• Fixed SettingsWindow lifecycle and focus-loss behavior.
• Fixed multiple timing issues caused by unnecessary async delays.
• Added additional diagnostic logging.

Features

• Added Dark, Light, System and Custom themes.
• Added double-click support on search results.
• Added automatic settings saving.
• Added overlay-style settings window.
• Changed default hotkey to Win + Y.