refactor(client): remove code related to view mode

[skirtles-code]

The file view-mode.ts is empty. I've removed it. It used to contain code for useToggleViewMode.

The file ViewModeSwitch.vue is unused. It contains code that attempts to call useToggleViewMode, even though it doesn't exist. This causes type checking to fail as it can't find the function.

settings.vue also contains a reference to useToggleViewMode. That code was already commented out but I've removed it.

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commit: 0bb8302