docs(Dropdown): add 2026-06-25 What changed section to multi-select a11y page

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: rivka-ungar

packages/docs/src/pages/components/Dropdown/DropdownMultiSelectA11y.mdx

@@ -5,6 +5,16 @@ import * as DropdownMultiSelectA11yStories from "./DropdownMultiSelectA11y.stori
 
 # Multi-select accessibility
 
+## What changed — 2026-06-25
+
+`interactiveChips` now exposes the current selection as the combobox's **value** so screen readers announce it on focus.
+
+| Issue                                                                                                    | Fix                                                                                                                                                  |
+| -------------------------------------------------------------------------------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------- |
+| The input stayed empty while chips carried the selection, so screen readers announced the focused field as blank (WCAG 4.1.2). | The combobox value now holds a short summary such as _"Chip one and 3 others"_, kept in sync across the menu, chip **×**, and keyboard removal.       |
+
+> Trade-off: because the input now carries the summary, type-to-search and Backspace-to-chip are unavailable while a selection exists.
+
 ## The problem
 
 A multi-select Dropdown shows the selected values as **chips rendered next to the input**. By default these chips are purely visual: the only way to remove one is to click its **×** with a mouse.