Record circuit editor UX debt

docs/spec/07-implementation-phases-todo.md

@@ -265,3 +265,25 @@ Acceptance criteria:
 Note:
 
 This phase may be moved earlier if repeated local startup overhead begins to slow down feature development.
+
+## Phase 10: Deferred Circuit Editor UX Polish
+
+Goal:
+
+Improve everyday usability after the core circuit workflows are stable.
+
+Tasks:
+
+- keep column headers visible while scrolling down long circuit lists
+- keep undo/redo controls reachable without scrolling to the top
+- preserve the user's viewport when toolbar undo/redo is applied instead of jumping to the changed row
+- reduce the default table width and contain horizontal scrolling within the editor
+- review sensible default columns and responsive behavior for typical browser widths
+- redesign column filtering with clearer controls, active-filter indicators and an easy reset action
+
+Acceptance criteria:
+
+- users retain column context anywhere in a long list
+- undo/redo does not disrupt the current reading position
+- the editor remains usable without overflowing the browser layout
+- active filters are easy to understand, change and clear