fix(web): fix navigation in session creation flow with back buttons

- Add back buttons to MachinesPage and SpawnPage for non-Telegram environments
- Fix navigation after session creation to clear spawn flow from history
- Update useAppGoBack hook to use explicit path navigation for consistent behavior

web/src/hooks/useAppGoBack.ts

@@ -1,6 +1,5 @@
 import { useCallback } from 'react'
 import { useLocation, useNavigate, useRouter } from '@tanstack/react-router'
-import { isTelegramApp } from '@/hooks/useTelegram'
 
 export function useAppGoBack(): () => void {
     const navigate = useNavigate()
@@ -8,11 +7,7 @@ export function useAppGoBack(): () => void {
     const pathname = useLocation({ select: (location) => location.pathname })
 
     return useCallback(() => {
-        if (!isTelegramApp()) {
-            router.history.back()
-            return
-        }
-
+        // Use explicit path navigation for consistent behavior across all environments
         if (pathname.startsWith('/sessions/')) {
             navigate({ to: '/sessions' })
             return
@@ -25,6 +20,10 @@ export function useAppGoBack(): () => void {
 
         if (pathname.startsWith('/machines')) {
             navigate({ to: '/sessions' })
+            return
         }
+
+        // Fallback to history.back() for other cases
+        router.history.back()
     }, [navigate, pathname, router])
 }