docs(changelog): #5441 cap update summary sessionStorage cache at 256KB

CHANGELOG.md

@@ -13,6 +13,7 @@
 
 ### Fixed
 
+- **The post-update "What's New" summary cache can no longer grow without bound.** Generated update summaries were cached in `sessionStorage` with no size limit, so repeated updates could accumulate until the browser's storage quota was hit. The cache is now capped at 256KB (measured in true UTF-8 bytes), keeping the newest entries that fit and dropping the oldest under pressure. Thanks @rodboev. (#5441, #5435)
 - **Screen readers no longer announce the approval and clarify dialogs while they're inactive.** The approval and clarify flyout cards stayed in the accessibility tree and tab order even when hidden, so a screen-reader user could land on a dialog that isn't actually showing. Inactive cards are now removed from assistive tech (`aria-hidden` + `inert`) and visually hidden (`hidden` + `display:none`), and restored when shown — with the show sequence ordered so the entrance animation still plays correctly. Thanks @sheldon-im. (#5404)
 - **Mobile: the transcript no longer jumps back up while the assistant is still rendering.** On mobile browsers, the layout engine's built-in scroll-anchoring would re-compensate `scrollTop` during the height churn of a streaming response, yanking the view back toward the top (residual of #4856). The fix suppresses browser overflow-anchoring across the *full* height-churn window rather than a single frame: consecutive renders extend one shared suppression window, and an independent hard-cap timer guarantees the suppression is always lifted (so a missed transition event can't pin it). Desktop is unaffected (no-op where the browser isn't anchoring). Thanks @allenliang2022. (#5392, #4856)
 - **The sidebar's session action menu no longer closes the moment you scroll the chat.** Opening a session's "…" action menu and then scrolling the conversation used to dismiss the menu immediately, because any scroll event closed it. Scrolls inside the chat transcript are now ignored (the menu stays put), scrolls of the sidebar list itself reposition the menu to keep it anchored to its row, and if a session-list refresh detaches that row the menu closes cleanly instead of floating orphaned. Thanks @nankingjing. (#5402, #5347)