feat: Add transcript-debug page with multi-agent support, hooks approval, and message selection

- Transcript debug: JSONL viewer, parsed chat view, realtime WebSocket updates, session selector
- Multi-agent: ejecutor, nucleo000, and claude (global ~/.claude/projects/) with agent switcher
- Hooks approval: permission/plan request forwarding via PowerShell hooks, long-poll API, UI modals
- Chat features: session ID copy, select mode with checkboxes, multi-select copy, select all/deselect all
- File watchers for all agent transcript directories with polling fallback on Windows

server/services/handlers/transcript-debug-handler.ts

@@ -0,0 +1,160 @@
+/**
+ * Transcript Debug Handler
+ * Watches all agent project dirs (.claude-ejecutor/projects/, .claude-nucleo000/projects/)
+ * for JSONL file changes and broadcasts notifications via the sync server.
+ *
+ * Uses a polling approach on Windows (fs.watch is unreliable for appends)
+ * combined with fs.watch for immediate detection.
+ */
+
+import { watch, existsSync, readdirSync, statSync, type FSWatcher } from 'fs'
+import { join } from 'path'
+import { homedir } from 'os'
+
+const AGENT_NAMES = ['ejecutor', 'nucleo000', 'claude']
+const DEBOUNCE_MS = 25
+const POLL_INTERVAL_MS = 1500
+
+// Per-agent state
+interface AgentWatcherState {
+  projectDir: string
+  watcher: FSWatcher | null
+  fileSizeCache: Map<string, number>
+  debounceTimer: ReturnType<typeof setTimeout> | null
+}
+
+const agentStates = new Map<string, AgentWatcherState>()
+let pollTimer: ReturnType<typeof setInterval> | null = null
+
+// Project hash matching the working dir
+const PROJECT_HASH = 'C--Users-jodar-agent-ui'
+
+function findProjectDir(workingDir: string, agent: string): string | null {
+  const agentDir = agent === 'claude'
+    ? join(homedir(), '.claude', 'projects')
+    : join(workingDir, `.claude-${agent}`, 'projects')
+  if (!existsSync(agentDir)) return null
+
+  // For claude global dir, go straight to the project hash
+  if (agent === 'claude') {
+    const exact = join(agentDir, PROJECT_HASH)
+    return existsSync(exact) ? exact : null
+  }
+
+  const dirs = readdirSync(agentDir)
+  return dirs.length > 0 ? join(agentDir, dirs[0]) : null
+}
+
+function emitChange(agent: string, sessionId: string, filename: string, projectDir: string, broadcast: (message: string) => void) {
+  const state = agentStates.get(agent)
+  if (!state) return
+
+  if (state.debounceTimer) clearTimeout(state.debounceTimer)
+  state.debounceTimer = setTimeout(() => {
+    const filePath = join(projectDir, filename)
+    let size = 0
+    try {
+      size = statSync(filePath).size
+    } catch {}
+
+    console.log(`[TranscriptDebug:${agent}] Change: ${filename} (${size} bytes)`)
+    broadcast(JSON.stringify({
+      type: 'transcript-debug-change',
+      sessionId,
+      agent,
+      filename,
+      size,
+      timestamp: Date.now()
+    }))
+  }, DEBOUNCE_MS)
+}
+
+export function setupTranscriptDebugWatcher(workingDir: string, broadcast: (message: string) => void) {
+  let anyWatched = false
+
+  for (const agent of AGENT_NAMES) {
+    const projectDir = findProjectDir(workingDir, agent)
+    if (!projectDir) continue
+
+    const state: AgentWatcherState = {
+      projectDir,
+      watcher: null,
+      fileSizeCache: new Map(),
+      debounceTimer: null
+    }
+
+    // Initialize file size cache
+    try {
+      const files = readdirSync(projectDir).filter(f => f.endsWith('.jsonl'))
+      for (const f of files) {
+        try {
+          state.fileSizeCache.set(f, statSync(join(projectDir, f)).size)
+        } catch {}
+      }
+    } catch {}
+
+    // fs.watch for immediate detection
+    try {
+      state.watcher = watch(projectDir, { recursive: false }, (_, filename) => {
+        if (!filename) return
+        if (!filename.endsWith('.jsonl')) return
+        const sessionId = filename.replace('.jsonl', '')
+        emitChange(agent, sessionId, filename, projectDir, broadcast)
+      })
+      console.log(`[TranscriptDebug] Watching ${agent}: ${projectDir}`)
+    } catch (e: any) {
+      console.error(`[TranscriptDebug] Watch failed for ${agent}: ${e.message}`)
+    }
+
+    agentStates.set(agent, state)
+    anyWatched = true
+  }
+
+  if (!anyWatched) {
+    console.log('[TranscriptDebug] No agent project directories found, skipping watcher')
+    return
+  }
+
+  // Shared polling fallback for all agents
+  pollTimer = setInterval(() => {
+    for (const [agent, state] of agentStates) {
+      try {
+        const files = readdirSync(state.projectDir).filter(f => f.endsWith('.jsonl'))
+        for (const f of files) {
+          try {
+            const size = statSync(join(state.projectDir, f)).size
+            const prevSize = state.fileSizeCache.get(f) || 0
+            if (size !== prevSize) {
+              state.fileSizeCache.set(f, size)
+              const sessionId = f.replace('.jsonl', '')
+              emitChange(agent, sessionId, f, state.projectDir, broadcast)
+            }
+          } catch {}
+        }
+        // Detect new files
+        for (const f of files) {
+          if (!state.fileSizeCache.has(f)) {
+            state.fileSizeCache.set(f, 0)
+          }
+        }
+      } catch {}
+    }
+  }, POLL_INTERVAL_MS)
+}
+
+export function cleanupTranscriptDebugWatcher() {
+  for (const [, state] of agentStates) {
+    if (state.watcher) {
+      state.watcher.close()
+    }
+    if (state.debounceTimer) {
+      clearTimeout(state.debounceTimer)
+    }
+  }
+  agentStates.clear()
+
+  if (pollTimer) {
+    clearInterval(pollTimer)
+    pollTimer = null
+  }
+}