a11y: plain words for runs, turns and sessions in thread nav

frontend/components/chat/session-details-rail.test.tsx

@@ -115,7 +115,7 @@ describe("SessionDetailsRail", () => {
     expect(html).toContain("Codex");
     expect(html).toContain('data-testid="runtime-model-requested"');
     expect(html).toContain(">requested<");
-    expect(html).toContain("does not report which model answered");
+    expect(html).toContain("not sent back");
   });
 
   test("a thread with unloaded outline turns says its plan and totals are partial", () => {

frontend/components/chat/session-details-rail.tsx

@@ -95,7 +95,7 @@ export function SessionDetailsRail({
                   rail says so instead of presenting the request as a fact. */}
               <span
                 className="truncate"
-                title="The model this run asked for. The runtime does not report which model answered."
+                title="The model this task asked for. Which model actually answered is not sent back."
               >
                 {engineDisplayLabel(newest.engine)} · {modelLabel(newest.model, newest.engine)}{" "}
                 <span data-testid="runtime-model-requested" className="text-text-tertiary">

frontend/components/chat/subagent-pane-body.tsx

@@ -73,7 +73,7 @@ export default function SubagentPaneBody({
   if (!run) {
     return (
       <PaneStub childSession={childSession}>
-        <LoadingState label="Loading run" />
+        <LoadingState label="Loading helper agent" />
       </PaneStub>
     );
   }

frontend/components/chat/subagent-pane.tsx

@@ -123,7 +123,7 @@ const SubagentPaneBody = dynamic(() => import("@/components/chat/subagent-pane-b
   ssr: false,
   loading: () => (
     <PaneStub label="Run">
-      <LoadingState label="Loading run" />
+      <LoadingState label="Loading helper agent" />
     </PaneStub>
   ),
 });
@@ -155,7 +155,7 @@ export function SubagentPane() {
   return createPortal(
     <aside
       aria-hidden={!open}
-      aria-label={`${target?.childSession ? "Subagent" : "Session"} pane`}
+      aria-label={`${target?.childSession ? "Helper agent" : "Conversation"} pane`}
       className={cn(
         "border-border-button-default bg-background-primary-default shadow-sidebar fixed inset-y-0 right-0 z-40 flex h-dvh w-[440px] max-w-[92vw] flex-col border-l",
         "transition-transform duration-300 ease-out",
@@ -245,7 +245,7 @@ export function SubagentPeekButton({
   return (
     <button
       type="button"
-      aria-label="Peek run"
+      aria-label="Peek at this task"
       onClick={(e) => {
         e.preventDefault();
         e.stopPropagation();

frontend/components/chat/subagents-fold.tsx

@@ -85,7 +85,7 @@ function GatewayChildRow({ child }: { child: GatewayChildSession }) {
       </div>
       <Link
         href={`/session/${child.id}`}
-        aria-label={`Open spawned session: ${firstLine(child.prompt)}`}
+        aria-label={`Open the task started here: ${firstLine(child.prompt)}`}
         title="Open as its own thread"
         className={ROW_LINK_CLASS}
       >

frontend/components/pro/queued-messages.tsx

@@ -57,7 +57,7 @@ function Row({
         <button
           type="button"
           onClick={onSendNow}
-          title="Stops the current turn; this message starts immediately"
+          title="Skips the waiting messages; this message is sent next"
           className="shrink-0 cursor-pointer text-caption-1-medium text-accent-500 underline-offset-2 outline-none hover:underline focus-visible:underline"
         >
           Send now

frontend/components/session-ui/message-scroller-rail.test.tsx

@@ -88,7 +88,7 @@ describe("render gating", () => {
     // Four ticks, each a titled button.
     expect(html.match(/<button/g)?.length).toBe(4);
     expect(html).toContain('title="first turn"');
-    expect(html).toContain('aria-label="Jump to turn 4: fourth turn"');
+    expect(html).toContain('aria-label="Jump to message 4: fourth turn"');
     // First tick is active on first paint (activeIndex defaults to 0).
     expect(html).toContain('aria-current="true"');
   });

frontend/components/session-ui/message-scroller-rail.tsx

@@ -116,7 +116,7 @@ export function MessageScrollerRail({
   return (
     <nav
       data-session-ui="message-scroller-rail"
-      aria-label="Jump to a turn"
+      aria-label="Jump to a message"
       className="pointer-events-none absolute inset-y-4 right-2 z-20 hidden flex-col items-end justify-center gap-1 overflow-hidden lg:flex"
     >
       {ticks.map((tick, index) => {
@@ -126,7 +126,7 @@ export function MessageScrollerRail({
             key={tick.id}
             type="button"
             title={tick.snippet}
-            aria-label={`Jump to turn ${index + 1}: ${tick.snippet}`}
+            aria-label={`Jump to message ${index + 1}: ${tick.snippet}`}
             aria-current={active ? "true" : undefined}
             onClick={() => jumpTo(index)}
             className="group pointer-events-auto flex h-3.5 w-3 items-center justify-end rounded-sm outline-none focus-visible:ring-2 focus-visible:ring-border-focus-ring"

frontend/components/session-ui/queued-message-pill.tsx

@@ -47,7 +47,7 @@ export function QueuedMessagePill({
           <button
             type="button"
             onClick={onSendNow}
-            title="Stops the current turn; this message starts immediately"
+            title="Skips the waiting messages; this message is sent next"
             className="shrink-0 cursor-pointer text-accent-500 underline-offset-2 outline-none hover:underline focus-visible:underline"
           >
             Send now