Chart builder: SelectControl pickers, channel chooser, per-type aggregates

docs/ux-second-pass.md

@@ -8,23 +8,15 @@ record the resolution into the contract (`docs/architecture/09`+`10` and the rel
 
 ## Open
 
-### Chart Builder — encoding type control: cycle vs. explicit pick
+_(none — the 2026-06-12 batch resolved all parked items: type-cycle chip → direct-pick
+SelectControl; field-assignment flow → explicit channel chooser + visible armed state, drag
+still deferred; "or constant" → "Use a constant" ghost button; chart-level controls →
+properties strip under the preview. Resolutions recorded in `architecture/10` §5 and
+`spec/06`.)_
 
-- **Where:** `src/app/components/ChartBuilderModal.tsx` → `ChannelPill` (the `pillType` chip).
-- **What:** a mapped channel's field type is shown as a **cycling chip** — activating it steps
-  N → O → Q → T within the set valid for the column/channel. It is compact and matches the
-  approved field-first pill design, but a _cycling_ button gives a screen-reader / keyboard
-  user no way to jump straight to a type; they step through the cycle. The pre-2B control was
-  an explicit `N | O | Q | T` segmented radio (direct pick, APG radio pattern).
-- **Decision to make:** keep the cycle, restore the explicit segmented control, or a hybrid
-  (chip for a quick mouse cycle + an accessible radio/menu for direct selection).
-- **Lens:** WAI-ARIA APG (radio vs. toggle button), IBM Carbon, the project's keyboard-first
-  accessibility bar.
+## Deferred (not design debts, revisit on demand)
 
-### Chart Builder — empty Colour/Size "or constant" affordance
-
-- **Where:** `ChannelPill` / `ChannelSlot` — the constant-value entry on Colour/Size (2A).
-- **What:** an empty Colour/Size slot offers a small underlined "or constant" text button to
-  switch the channel from a field binding to a fixed `{ value }`. Confirm the copy, emphasis,
-  and discoverability read well alongside the field-assign affordance.
-- **Lens:** Carbon / GOV.UK content + control emphasis.
+- **Drag-and-drop field assignment** — chips are click/keyboard-first by design; drag would
+  be a progressive enhancement on top of the chooser model, not a replacement. Revisit if
+  real usage asks for it (likely alongside Phase 4 faceting, where drag-to-shelf reads most
+  naturally).