fix navigation, modality, and confirm

[sbatten]

No description provided.

[bpasero]

@sbatten good stuff overall. I added one request for change.

Then some issues I noticed:

• looks like mnemonic handling is still needed (see image below)
• while a dialog is visible, the dialog service should probably not allow for another dialog to open (e.g. have a queue of dialogs to show when multiple are requested)
• colors: I see the changes in theme, but see no explicit color definitions for extensions to tweak? do we need new colors for the dialog?
• colors: I see you are using Button widget, but I see no updating of its styles when themes change. I think you need to propagate that including the button colors. we have other widgets as examples that are composed of multiple themeable things in base
• the close button does not seem to be accessible via keyboard navigation. Update: actually do not change this, its good!
• ARIA: we might need to explicitly announce the dialog when it opens, there is maybe examples for how to do custom dialogs in terms of accessibility
• I am still able to bring up quick open (Cmd+P) while a modal dialog is open, which should probably be prevented

[bpasero]

@misolori I see we are probably just using our existing error/warning/info icons in the dialogs, but I feel like they do not fit as good as in the small version. Any thoughts on changing them for the dialogs?

fixed