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* feat(authz): gate thread-delete and run-cancel UI on effective permissions (Phase 4, #4063) Consume the effective route permissions surfaced by #5228 so the UI hides actions the caller's role cannot perform: - threads:delete hides the sidebar thread-row Delete menu item and the sidecar panel delete button (every useDeleteThread consumer) - runs:cancel disables the composer stop affordance; all three stop entry points converge on one check inside handleStopStreaming hasPermission treats an absent/null/unresolved permission list as permissive, so a mixed old-backend/new-frontend deploy never hides actions the caller can still perform. The Gateway @require_permission guards remain the single enforcement point. * fix(authz): review follow-ups for stop gating (comment accuracy, a11y, tests) - Correct the defense-in-depth comment: the submit-button click is the only live entry into handleStopStreaming (handleSubmit returns early with the pleaseWaitStreaming toast while streaming, so the kind==="stop" branch is unreachable); the handler gate stays as future-proofing. - Explain the disabled stop affordance with aria-label + title (Radix tooltips don't fire on disabled buttons), with en-US/zh-CN strings. - Add the composer stop-gating DOM tests (disabled + onStop never fires + permissive default) and the sidebar delete-menu gating tests, so all gated surfaces carry wiring tests. * fix(authz): stop conditional aria-label from stripping the submit name The stop-gating follow-up (1612855b) explained the disabled stop affordance with aria-label/title but passed explicitly-undefined values in the non-denied case. PromptInputSubmit declares its default aria-label="Submit" before {...props}, so the undefined key landed in the spread and clobbered the default: React omits the attribute entirely and the submit control lost its accessible name in every state, which broke the sidecar e2e layout helper (it locates the button by its "Submit" label). Spread the attributes conditionally so they only attach when stopDenied, and lock the invariant with a DOM test asserting the base "Submit" name survives when stop is not denied (mutation-verified: reverting the conditional spread turns the new test red). * test(authz): drop unused rerenderWith helper, guard accessible name by role query Address the review nit on the stop-gating DOM tests: the rerenderWith helper was never called, and a second render() would append a composer instead of updating the first one anyway — drop it (the sidecar-delete-gating tests already demonstrate the correct rerender pattern if a granted->denied flip test is ever needed). Also resolve the accessible-name regression guard through getByRole("button", { name: "Submit" }) so it fails exactly the way e2e and assistive tech consume the control (mutation-verified: the explicitly-undefined aria-label form turns it red). --------- Co-authored-by: Willem Jiang <willem.jiang@gmail.com>