feat: Added light mode plus various bug fixes

- Added click handler for Easter egg that enables music inspiration feature.
- Updated credits page to include new icons and handle click events.
- Enhanced inspiration page to fetch and display Spotify track embed HTML.
- Refactored inspiration loading logic to include track data.
- Introduced theme selection in settings with light and dark modes.
- Updated settings page to reflect new theme options and improve toast messages.
- Refined layout styles across various pages for consistent theming.
- Bumped application version to 1.5.0 in installer script.

config.ini

@@ -1,8 +1,8 @@
 [EMLy]
 SDK_DECODER_SEMVER          = 1.3.2
-SDK_DECODER_RELEASE_CHANNEL = beta
-GUI_SEMVER                  = 1.4.0
-GUI_RELEASE_CHANNEL         = stable
+SDK_DECODER_RELEASE_CHANNEL = stable
+GUI_SEMVER                  = 1.5.0
+GUI_RELEASE_CHANNEL         = beta
 LANGUAGE                    = it
 UPDATE_CHECK_ENABLED        = false
 UPDATE_PATH                 =