refactor: extract session summary utilities to shared module

shared/src/index.ts

@@ -1,3 +1,4 @@
 export * from './messages'
 export * from './modes'
+export * from './sessionSummary'
 export type * from './types'

shared/src/sessionSummary.ts

@@ -0,0 +1,53 @@
+import type { ModelMode } from './modes'
+import type { Session, WorktreeMetadata } from './schemas'
+
+export type SessionSummaryMetadata = {
+    name?: string
+    path: string
+    machineId?: string
+    summary?: { text: string }
+    flavor?: string | null
+    worktree?: WorktreeMetadata
+}
+
+export type SessionSummary = {
+    id: string
+    active: boolean
+    thinking: boolean
+    activeAt: number
+    updatedAt: number
+    metadata: SessionSummaryMetadata | null
+    todoProgress: { completed: number; total: number } | null
+    pendingRequestsCount: number
+    modelMode?: ModelMode
+}
+
+export function toSessionSummary(session: Session): SessionSummary {
+    const pendingRequestsCount = session.agentState?.requests ? Object.keys(session.agentState.requests).length : 0
+
+    const metadata: SessionSummaryMetadata | null = session.metadata ? {
+        name: session.metadata.name,
+        path: session.metadata.path,
+        machineId: session.metadata.machineId ?? undefined,
+        summary: session.metadata.summary ? { text: session.metadata.summary.text } : undefined,
+        flavor: session.metadata.flavor ?? null,
+        worktree: session.metadata.worktree
+    } : null
+
+    const todoProgress = session.todos?.length ? {
+        completed: session.todos.filter(t => t.status === 'completed').length,
+        total: session.todos.length
+    } : null
+
+    return {
+        id: session.id,
+        active: session.active,
+        thinking: session.thinking,
+        activeAt: session.activeAt,
+        updatedAt: session.updatedAt,
+        metadata,
+        todoProgress,
+        pendingRequestsCount,
+        modelMode: session.modelMode
+    }
+}

shared/src/types.ts

@@ -10,6 +10,8 @@ export type {
     WorktreeMetadata
 } from './schemas'
 
+export type { SessionSummary, SessionSummaryMetadata } from './sessionSummary'
+
 export type {
     AgentFlavor,
     ClaudePermissionMode,