feat(web): session list attention indicators for blocked, ready, and unread states

[heavygee]

Summary

After #694, session-list spinners clear correctly when background sessions finish. The sidebar still does not indicate why a session stopped or needs the user.

Expected

When a session is not selected, show a compact attention indicator:

• Permission — tool approval pending (amber)
• Input — ask-user / plan-exit style prompts (blue)
• Background — background tasks still running (non-spinner)
• Unread — new activity since the session was last opened (dot)

Replace the generic pending N label with kind-specific indicators where possible.

Context

• Related: Add read/unread indicators for session activity #270 (unread markers), fix(web): keep global SSE alive for session list status updates #694 (SSE freshness prerequisite — merged)
• Client-side lastSeenAt in localStorage is acceptable for v1

Out of scope

• Hub-synced read state across devices
• Session-ended / error reason badges (follow-up)

[heavygee]

Implementation: #699 (pending CI)

[github-actions]

Confirmed: this is not implemented in the current session list. The sidebar currently only surfaces an aggregate pending N from SessionSummary.pendingRequestsCount; it does not distinguish approval requests from ask-user / plan-exit prompts, does not carry backgroundTaskCount into the list summary, and I did not find a client-side lastSeenAt / unread implementation in web/src.

For a v1, the code already has enough raw request detail on full sessions to classify pending request tool names, but the list API summary would need to expose kind-specific attention data (or enough request/background data for the web client to derive it). Client-only unread state can be added separately against updatedAt and selected/opened session state.

Relevant code:

• web/src/components/SessionList.tsx:149 - project group sorting promotes active sessions with pendingRequestsCount > 0.
• web/src/components/SessionList.tsx:432 - collapsed previews force pending sessions to remain visible using only pendingRequestsCount.
• web/src/components/SessionList.tsx:622 - sidebar renders the current generic pending N label.
• shared/src/sessionSummary.ts:13 - SessionSummary exposes pendingRequestsCount, but not pending request kinds or backgroundTaskCount.
• shared/src/sessionSummary.ts:26 - summary computes pending count from session.agentState.requests only.
• shared/src/schemas.ts:62 - pending request entries include tool, arguments, and createdAt, which can support permission/input classification if exposed or summarized.
• shared/src/schemas.ts:198 - full Session has agentState; shared/src/schemas.ts:202 has backgroundTaskCount.
• web/src/components/AssistantChat/StatusBar.tsx:49 - selected-session status already detects pending requests from full agentState.
• web/src/components/AssistantChat/StatusBar.tsx:89 - selected-session status already detects backgroundTaskCount > 0.
• web/src/hooks/useSSE.ts:333 - SSE patching of session summaries currently updates active/thinking/timestamps/model/effort, not pending counts or background count from patch data.

---

HAPI Bot

[heavygee]

PR #699 also adds Settings → Display → Session list status (Standard/Detailed) and a scheduled-message clock icon in Detailed mode when future scheduled messages are pending (futureScheduledMessageCount).