fix: TS build errors, dedup guards, model switcher rebuild

- Guard nullable getSessionFilePath return in chat.ts
- Cast backend for listGatewaySessions (OpenClaw-specific, not on interface)
- Replace findLastIndex with manual loop in streaming tests (es2022 compat)
- Remove unused vitest imports in streaming.test.ts
- Add missing mock properties in ws.test.ts
- Rebuild client with all fixes applied

Author: Hex

packages/server/src/chat/chat.ts

@@ -290,6 +290,7 @@ export function createChatModule(
     if (pollTimers.has(threadKey)) return // already polling
 
     const filePath = getSessionFilePath(sessionKey)
+    if (!filePath) return
 
     // Start from current file size (only read NEW entries)
     try {

packages/server/src/chat/routes.ts

@@ -191,17 +191,20 @@ export function createChatRoutes(chatModule: ChatModule, backend: AgentBackend,
     let activeStatus = live.status
     if (!activeStatus || activeStatus === 'idle') {
       // Check gateway for real agent status — fire-and-forget, don't block SSE
-      backend
-        .listGatewaySessions()
-        .then((sessions) => {
-          const sessionKey = chatModule.resolveSessionKey(threadKey)
-          const match = sessions.find((s: any) => s.key === sessionKey)
-          if (match && match.agentStatus && match.agentStatus !== 'idle') {
-            send('status', { status: match.agentStatus, threadKey })
-            chatModule.ensurePolling(threadKey, match.agentStatus)
-          }
-        })
-        .catch(() => {})
+      const backendAny = backend as any
+      if (typeof backendAny.listGatewaySessions === 'function') {
+        backendAny
+          .listGatewaySessions()
+          .then((sessions: any[]) => {
+            const sessionKey = chatModule.resolveSessionKey(threadKey)
+            const match = sessions.find((s: any) => s.key === sessionKey)
+            if (match && match.agentStatus && match.agentStatus !== 'idle') {
+              send('status', { status: match.agentStatus, threadKey })
+              chatModule.ensurePolling(threadKey, match.agentStatus)
+            }
+          })
+          .catch(() => {})
+      }
     }
     if (activeStatus && activeStatus !== 'idle') {
       send('status', { status: activeStatus, threadKey })

packages/server/src/chat/streaming.test.ts

@@ -1,7 +1,7 @@
 // Tests for chat streaming, turn completion, and work item handling
 // Run: cd packages/server && npx vitest run src/chat/streaming.test.ts
 
-import { describe, it, expect, vi, beforeEach } from 'vitest'
+import { describe, it, expect } from 'vitest'
 import type { WorkItem, ParsedTurn } from '@sovereign/core'
 
 // ── Test: thinking accumulation ────────────────────────────────────────
@@ -129,7 +129,13 @@ describe('thinking work item replacement', () => {
 
     // Replace logic
     const items = [...workItems]
-    const lastThinkIdx = items.findLastIndex((w) => w.type === 'thinking')
+    let lastThinkIdx = -1
+    for (let i = items.length - 1; i >= 0; i--) {
+      if (items[i].type === 'thinking') {
+        lastThinkIdx = i
+        break
+      }
+    }
     if (lastThinkIdx >= 0) {
       items[lastThinkIdx] = newThinking
     } else {
@@ -146,7 +152,13 @@ describe('thinking work item replacement', () => {
     const newThinking: WorkItem = { type: 'thinking', output: 'New thought', timestamp: 2 }
 
     const items = [...workItems]
-    const lastThinkIdx = items.findLastIndex((w) => w.type === 'thinking')
+    let lastThinkIdx = -1
+    for (let i = items.length - 1; i >= 0; i--) {
+      if (items[i].type === 'thinking') {
+        lastThinkIdx = i
+        break
+      }
+    }
     if (lastThinkIdx >= 0) {
       items[lastThinkIdx] = newThinking
     } else {

packages/server/src/chat/ws.test.ts

@@ -38,7 +38,10 @@ function createMockChatModule(): ChatModule {
     loadMapping: vi.fn(),
     chatEvents: new EventEmitter(),
     getLiveState: vi.fn(() => ({})),
-    resolveSessionKey: vi.fn((tk: string) => `session-${tk}`)
+    resolveSessionKey: vi.fn((tk: string) => `session-${tk}`),
+    ensurePolling: vi.fn(),
+    trackSSEClient: vi.fn(),
+    untrackSSEClient: vi.fn()
   }
 }