Integrate compact editor actions and fix header units

docs/circuit-list-editor-interactions.md

@@ -127,11 +127,30 @@ Cross-section device moves show confirmation-required feedback before drop. The
 
 ## Filtering and Sorting
 
+- Clicking a column label changes sorting; the funnel icon next to it opens
+  the value filter. An active filter is highlighted and shows the number of
+  selected values. Both controls retain German accessible names and tooltips.
+- Header labels wrap between words; trailing units such as `[kW]` appear on
+  a separate line.
 - Per-column filtering works on normalized displayed values.
 - Sorting is view-level first and treats circuits as blocks.
 - Multi-device circuits are not split during sort.
 - Sorting alone does not persist order.
 
+## Action Buttons
+
+The editor toolbar uses icons with visible German labels. Group headers and
+circuit/device rows use compact icon buttons with German accessible names and
+tooltips. Group protection buttons additionally show `VS` or `FI` to distinguish
+their roles. Dividers separate related actions; destructive actions use the
+danger style. Circuit deletion uses a trash icon, while device-row deletion
+uses a crossed-out list icon.
+
+The shared `src/frontend/components/icon-button.tsx` component preserves
+disabled states and expanded states for toggles. Row and group action buttons
+retain `tabIndex={-1}` so the spreadsheet's existing cell navigation remains
+unchanged. The existing command handlers and deletion confirmations are reused.
+
 ## Apply Sorted Order
 
 `Apply sorted order` persists current sorted block order to backend by section.