50 Refinements of the WordPress Playground UI

v1 explored 100 wide-ranging metaphors. v5 takes the 10 directions the user marked as good, distills the principles that made them work, and pushes each one further.

Each design honors a hard constraint set: iframe primacy with an explicit fullscreen toggle, ≤ 8 affordances at idle, one canonical home per feature, one secondary surface that swaps content, glass used only when it earns its keep.