fix: add missing branching files and TypeScript fix

- Add BranchRevivalCard, BranchTransitionBar, useHandoff, useResolutionOutputs, SessionQueuePage
- Fix useFlowPilotSession: add is_branching/active_branch_id defaults

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

frontend/src/hooks/useResolutionOutputs.ts

@@ -0,0 +1,43 @@
+import { useState, useCallback } from 'react'
+import { resolutionsApi } from '@/api'
+import type { ResolutionOutputResponse, PushDestination } from '@/types/branching'
+import { toast } from '@/lib/toast'
+
+export function useResolutionOutputs(sessionId: string) {
+  const [outputs, setOutputs] = useState<ResolutionOutputResponse[]>([])
+  const [isLoading, setIsLoading] = useState(false)
+
+  const loadOutputs = useCallback(async () => {
+    setIsLoading(true)
+    try {
+      const data = await resolutionsApi.getOutputs(sessionId)
+      setOutputs(data.outputs)
+    } catch {
+      toast.error('Failed to load resolution outputs')
+    } finally {
+      setIsLoading(false)
+    }
+  }, [sessionId])
+
+  const editOutput = useCallback(async (outputId: string, content: string) => {
+    try {
+      const updated = await resolutionsApi.editOutput(sessionId, outputId, { edited_content: content })
+      setOutputs(prev => prev.map(o => o.id === updated.id ? updated : o))
+      toast.success('Changes saved')
+    } catch {
+      toast.error('Failed to save changes')
+    }
+  }, [sessionId])
+
+  const pushOutput = useCallback(async (outputId: string, destination: PushDestination) => {
+    try {
+      await resolutionsApi.pushOutput(sessionId, outputId, { destination })
+      toast.success(`Pushed to ${destination}`)
+      await loadOutputs()
+    } catch {
+      toast.error('Failed to push output')
+    }
+  }, [sessionId, loadOutputs])
+
+  return { outputs, isLoading, loadOutputs, editOutput, pushOutput }
+}