feat(client): improve workspace session browsing

packages/host/apiproxy/src/api/events.schema.ts

@@ -71,6 +71,7 @@ export const hostFrameSchema = z.discriminatedUnion('type', [
   z.object({
     type: z.literal('host/session-added'),
     sessionId: sessionIdSchema,
+    createdAt: z.number().optional(),
     blank: z.boolean(),
     parentSessionId: sessionIdSchema.optional(),
     origin: z.literal('subagent').optional(),

packages/host/apiproxy/src/api/events.ts

@@ -127,6 +127,7 @@ export type HostFrame =
   | {
     type: 'host/session-added'
     sessionId: SessionId
+    createdAt?: number
     blank: boolean
     parentSessionId?: SessionId
     origin?: 'subagent'

packages/host/apiproxy/src/api/sessions.schema.ts

@@ -51,6 +51,7 @@ export const sessionEventSchema = z.object({
 /** SessionSummary row of session.list (`projections` reuses the history block's shape and schema). */
 export const sessionSummarySchema = z.object({
   sessionId: sessionIdSchema,
+  createdAt: z.number().optional(),
   updatedAt: z.number(),
   running: z.boolean(),
   blank: z.boolean(),

packages/host/apiproxy/src/api/sessions.ts

@@ -147,6 +147,8 @@ export type QueueAction =
 /** Session list entry (v1 builds no index: list does readdir+stat). */
 export interface SessionSummary {
   sessionId: SessionId
+  /** Session creation time from the durable session header when supplied by the Host. */
+  createdAt?: number
   /**
    * Last activity. Attached: the last non-`session/end-seed` event, since a
    * pickup is not activity. Cold: the log's mtime, or `createdAt` for a backend