Migrate Livedata to Stateflow

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# Migrate ViewModel from LiveData to StateFlow + MVI

Follow **android-presentation-mvi** and **android-coroutines-flow** exactly.

## ViewModel to migrate
- ViewModel class: `[VIEWMODEL_NAME]` (e.g. `DashboardViewModel`)
- Module / file path: `[FILE_PATH]`
- Current LiveData fields: `[LIVEDATA_FIELDS]`
  (e.g. `val articles: LiveData<List<Article>>`, `val isLoading: LiveData<Boolean>`)
- Current observer sites (fragments/activities): `[OBSERVER_SITES]`
  (e.g. `DashboardFragment`, `MainActivity`)

## Paste the existing ViewModel source below