[The Framework] dashboard: choice gates in the right rail (all sets at once + sticky nav)

[suleimansh]

Part of #314. Today a single choice gate renders inline in the main view (ChoicePanel, #434). The spec wants all pending choice SETS shown at once in the right sidebar as a long scroll with a sticky top-nav to jump between them. Also add Ctrl+Enter on Accept (parity with the retired page).