return to agents view when leaving a subagent opened from it

[kevinjosethomas]

• opening a subagent from the agents view and pressing back dropped you into the parent agent's chat instead of the agents view you came from.
• the session now remembers it was launched straight into a subagent detail and returns to the agents view on back, while subagents opened from within a chat still go back to that chat.
• the back hint reads "back to agents" in that case so the destination is clear.

---

Note

Low Risk
UI navigation and agents-view state restoration only; no auth, daemon protocol, or data-model changes beyond optional fields on existing result types.

Overview
Fixes navigation when you open a subagent from the agents view: Back now returns to the agents list instead of the parent agent chat.

The agents view persists an ancestor session-id chain when opening a subagent and, on return, re-expands nested subagent rows and reselects that subagent (session ids are used so expansion survives identity changes when a parent goes active→persisted).

In interactive mode, sessions launched from the agents view with returnToAgentsView set a flag when entering via initialSubagentNodeId; Back from subagent detail calls returnToAgentsView() instead of closing only the panel. ChildAgentDetailComponent gets a configurable back hint ("back to agents" vs default "back to chat").

Adds a test that nested subagents only appear after both parent levels are expanded.

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Note

Return to agents view when leaving a subagent opened from it

• When a subagent is opened from the agents view, the ancestor session ID chain is stored in persistent state so the agents view can restore expansion and selection on return.
• applyPendingAncestorExpansion walks the stored session IDs, expands matching parent rows, and rebuilds the row list until all ancestors are visible.
• The back hint label in ChildAgentDetailComponent is now configurable, showing 'back to agents' when entered via the agents view and 'back to chat' otherwise.
• InteractiveMode tracks entry path via enteredSessionViaSubagentDetail and routes onCancel back to the agents view when appropriate.

^{Macroscope summarized ec8cfa5.}

[linear]

ENG-4255 Opening subagents from Agents View and returning should open Agents View

Opening subagents from Agents View and returning should open Agents View, while it currently opens the chat view of the parent agemt

Review in Linear

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