Use plain words for runs, turns and sessions in thread navigation #339

Screen reader labels and tooltips around the conversation say "Jump to turn 3", "Peek run", "Loading run", "Open spawned session" and "Stops the current turn", so these controls are hard to understand when you can't see them.

Where to start

1. Reword the labels in message-scroller-rail.tsx (Jump to a turn, Jump to turn N), subagent-pane.tsx (Run, Loading run, Session pane, Peek run), subagent-pane-body.tsx (Loading run), subagents-fold.tsx (Open spawned session) and pro/queued-messages.tsx (Stops the current turn).
2. Reword the model row tooltip in session-details-rail.tsx ("The model this run asked for. The runtime does not report which model answered.").
3. Use words like message, task and helper agent; update tests that match the old strings.

Code to look at:

• frontend/components/session-ui/message-scroller-rail.tsx:119
• frontend/components/session-ui/message-scroller-rail.tsx:129
• frontend/components/chat/subagent-pane.tsx:126
• frontend/components/chat/subagent-pane.tsx:158
• frontend/components/chat/subagent-pane.tsx:248
• frontend/components/chat/subagent-pane-body.tsx:76
• frontend/components/chat/subagents-fold.tsx:88
• frontend/components/pro/queued-messages.tsx:60
• frontend/components/chat/session-details-rail.tsx:98

Done when

• None of the listed labels or tooltips say run, turn, session, spawned or runtime.
• bun test components passes.

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