fix: synchronize scheduled task status and run actions

Reflect queued and active schedule runs in task status, refresh tasks on queue changes, and prevent duplicate Run Now actions until the current run finishes. Add lifecycle regression coverage and update scheduled task behavior documentation.

This file-level commit also includes concurrent conversation history, browser workbar, and runtime selection changes in the affected files. Focused schedule regressions passed; full workspace validation has unrelated failures as recorded during development.

Release note: Scheduled tasks now refresh their queued and running status and keep Run Now disabled while an occurrence is active.

src/main/assistant/assistant-database.test.ts

@@ -1965,7 +1965,7 @@ describe('AssistantDatabase', () => {
     database.close()
   })
 
-  it('returns the latest 500 remote messages in chronological order', () => {
+  it('returns all remote messages in chronological order beyond 500', () => {
     // Exercise the query boundary without 502 disk-synchronized fixture writes.
     const database = new AssistantDatabase(':memory:')
     database.initialize('C:\\Workspace')
@@ -1992,8 +1992,8 @@ describe('AssistantDatabase', () => {
     }
 
     const messages = database.getConversation(conversation.id).messages
-    expect(messages).toHaveLength(500)
-    expect(messages[0]?.content).toBe('消息 2')
+    expect(messages).toHaveLength(502)
+    expect(messages[0]?.content).toBe('消息 0')
     expect(messages.at(-1)?.content).toBe('消息 501')
     database.close()
   })
@@ -3708,6 +3708,9 @@ describe('AssistantDatabase', () => {
       recurrence: 'daily',
       nextRunAt: '2026-08-20T09:00:00.000Z'
     })
+    const taskStatus = (): string | undefined =>
+      database.listTasks().find((task) => task.id === schedule.taskId)?.status
+    expect(taskStatus()).toBe('idle')
 
     const [dueItem] = database.queueDueSchedules(
       new Date('2026-08-20T09:01:00.000Z')
@@ -3718,6 +3721,10 @@ describe('AssistantDatabase', () => {
       scheduleId: schedule.id,
       taskId: schedule.taskId
     })
+    expect(taskStatus()).toBe('queued')
+    expect(() => database.queueScheduleNow(schedule.id)).toThrow(
+      '定时任务已有一次运行正在进行'
+    )
     expect(database.listConversationQueueItems()).toEqual([
       expect.objectContaining({ id: dueItem!.id })
     ])
@@ -3737,18 +3744,28 @@ describe('AssistantDatabase', () => {
       schedule: { id: schedule.id },
       runId: dueItem!.id
     })
+    expect(taskStatus()).toBe('running')
+    database.updateTaskStatus(schedule.taskId, 'waiting_approval')
+    expect(taskStatus()).toBe('waiting_approval')
+    database.updateTaskStatus(schedule.taskId, 'running')
+    expect(taskStatus()).toBe('running')
     database.completeScheduleRun(
       dueItem!.id,
       'completed',
       new Date('2026-08-20T09:02:00.000Z')
     )
+    expect(taskStatus()).toBe('idle')
 
+    database.setScheduleEnabled(schedule.id, false)
+    expect(taskStatus()).toBe('paused')
     const manualItem = database.queueScheduleNow(schedule.id)
+    expect(taskStatus()).toBe('queued')
     expect(manualItem).toMatchObject({
       source: 'schedule',
       scheduleId: schedule.id
     })
     database.cancelConversationQueueItem(manualItem.id)
+    expect(taskStatus()).toBe('paused')
     expect(database.listConversationQueueItems()).toEqual([])
     database.close()
   })
@@ -4781,7 +4798,7 @@ describe('AssistantDatabase', () => {
     database.close()
   })
 
-  it('keeps incremental local conversation storage bounded to 500 messages', async () => {
+  it('preserves history beyond 500 messages across incremental saves', async () => {
     const directory = await mkdtemp(
       join(tmpdir(), 'goodbuddy-bounded-local-conversation-')
     )
@@ -4832,8 +4849,9 @@ describe('AssistantDatabase', () => {
     ])
 
     const restored = database.getConversation(conversationId)
-    expect(restored.messages).toHaveLength(500)
-    expect(restored.messages[0]?.id).toBe(messageId(1))
+    expect(restored.messages).toHaveLength(501)
+    expect(restored.messages[0]?.id).toBe(messageId(0))
+    expect(database.listConversations().find((item) => item.id === conversationId)?.messages).toHaveLength(501)
     expect(restored.messages.at(-1)?.id).toBe(newestMessageId)
     const raw = new DatabaseSync(databasePath)
     expect(
@@ -4846,8 +4864,8 @@ describe('AssistantDatabase', () => {
         )
         .get(conversationId)
     ).toEqual({
-      count: 500,
-      minimum: 1,
+      count: 501,
+      minimum: 0,
       maximum: 500
     })
     raw.close()