[Question]: button styles

### What is your question?

There are plenty of buttons in a `teal` app. Some of them react to theme changes, while others maintain their style regardless of theme.

##### These buttons can be themed:
- reporter buttons; `button` elements created with `shiny::tags$button`
- buttons in the snapshot manager; `a` elements created with `actionLink`

##### These buttons cannot be themed:
- buttons in the `teal` navbar (the filter hamburger and wunder bar buttons); `button` elements created with `shiny::tags$button`
- buttons in the output from `teal.widgets`; `button` elements created with `shinyWidgets::dropdownButton` and `shiny::actionButton`

All of this causes something of a style inconsistency.

#### QUESTION

Is this deliberate? If not, are there plans to unify this? If so, in which direction?

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