* [Glitch] Fix undefined `current_flavour` in controllers
After the theming infrastructure migration (#37612, #37807),
`ThemingConcern` was removed and theme-related methods were moved
to `ThemeHelper`. However, controllers like `Settings::FlavoursController`
call `current_flavour` directly in their actions, which is not accessible
from a view helper module.
Include `ThemeHelper` in `ApplicationController` to restore access to
`current_flavour`, `current_skin`, `current_theme`, and other theme
methods in all controllers.
Co-authored-by: Cursor <cursoragent@cursor.com>
* Include ThemeHelper in Settings::FlavoursController instead of ApplicationController
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Co-authored-by: Cursor <cursoragent@cursor.com>
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