Fix: Course structure in offline mode

[PavloNetrebchuk]

• Fixed display of the course structure in offline mode.
• Performed minor code refactoring.

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[k1rill]

Just strange construction with scopes: launch in viewModelScope, then 2 asyncs in supervisorScope and awaitings in Pair

I would like to suggest using flows, but it would require a deep refactor of other layers.

[PavloNetrebchuk]

Just strange construction with scopes: launch in viewModelScope, then 2 asyncs in supervisorScope and awaitings in Pair

I would like to suggest using flows, but it would require a deep refactor of other layers.

@k1rill I agree with you. We will return to this later