Why: Retained React nodes alone did not prove actual browser scrolling was preserved.
Evidence: The settled Chromium case failed on the previous bundle, then all 11 browser cases passed with exact material, scroll and focus assertions.
Impact: Browser regression coverage only; fixture transport stays outside the production bundle.
Refs: UI10, ce-code-review UI finding #3, work-companion-ui
Why: Opening the auxiliary work pane should keep the conversation compact.
Evidence: Existing Playwright browser suite passed all 10 cases, including finished Collapsible transition.
Impact: Test and screenshot timing only; product behavior is unchanged.
Refs: Dev feature/work-companion-ui, UI03
Why: make material, background work, confirmations and files accessible to nontechnical users across desktop and mobile.
Evidence: Dev SELF receipts for Frontend tsc, 190 tests, knip baseline, build, nine fixture browser cases and two real HTTP/browser smoke cases using MockRunner.
Impact: existing API and permissions remain authoritative; stale events/queries and duplicate effects are guarded, while one file preview and reading state are preserved.
Refs: work-companion-ui design r0.2 and plan r1 U2-U5; UI01-UI13.
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