Add functions for managing chat library sessions and update effects in App.jsx

src/App.jsx

@@ -874,6 +874,68 @@ async function regenerateFromIndex(index, overrideUserText = null) {
     return chatLibraryHasActiveJob ? ' (syncing)' : ' (needs sync)'
   }, [chatLibrary, chatLibraryHasActiveJob])
 
+  function getChatLibrarySlugForSession(sessionId) {
+    if (!sessionId) return null
+    return chatLibraryBySession[sessionId] || null
+  }
+
+  function getChatLibraryForSession(sessionId) {
+    const slug = getChatLibrarySlugForSession(sessionId)
+    if (!slug) return null
+    return libraries.find(lib => lib.slug === slug) || null
+  }
+
+  function isLibrarySyncing(slug) {
+    if (!slug) return false
+    return libraryJobs.some(job => job.slug === slug && (job.status === 'queued' || job.status === 'running'))
+  }
+
+  function setChatLibraryForSession(sessionId, slug) {
+    if (!sessionId) return
+    setChatLibraryBySession(prev => {
+      const next = { ...(prev || {}) }
+      if (slug) {
+        next[sessionId] = slug
+      } else {
+        delete next[sessionId]
+      }
+      return next
+    })
+  }
+
+  function removeLibraryFromChatSelections(slug) {
+    if (!slug) return
+    setChatLibraryBySession(prev => {
+      let changed = false
+      const next = {}
+      for (const [sessionId, librarySlug] of Object.entries(prev || {})) {
+        if (librarySlug === slug) {
+          changed = true
+          continue
+        }
+        next[sessionId] = librarySlug
+      }
+      return changed ? next : prev
+    })
+  }
+
+  useEffect(() => {
+    if (!isDbPickerOpen) return
+
+    const onPointerDown = (event) => {
+      if (!dbPickerRef.current?.contains(event.target)) {
+        setIsDbPickerOpen(false)
+      }
+    }
+
+    document.addEventListener('mousedown', onPointerDown)
+    return () => document.removeEventListener('mousedown', onPointerDown)
+  }, [isDbPickerOpen])
+
+  useEffect(() => {
+    setIsDbPickerOpen(false)
+  }, [activeSessionId, activeSidebarMode])
+
   // Persist the scrollTop of the session we are LEAVING (on chat change or when leaving the chat view)
   useEffect(() => {
     const leavingSessionId = activeSessionId;