Add claude-code-source-code and claw-code directories

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

claude-code-source-code/src/hooks/useElapsedTime.ts

@@ -0,0 +1,37 @@
+import { useCallback, useSyncExternalStore } from 'react'
+import { formatDuration } from '../utils/format.js'
+
+/**
+ * Hook that returns formatted elapsed time since startTime.
+ * Uses useSyncExternalStore with interval-based updates for efficiency.
+ *
+ * @param startTime - Unix timestamp in ms
+ * @param isRunning - Whether to actively update the timer
+ * @param ms - How often should we trigger updates?
+ * @param pausedMs - Total paused duration to subtract
+ * @param endTime - If set, freezes the duration at this timestamp (for
+ *   terminal tasks). Without this, viewing a 2-min task 30 min after
+ *   completion would show "32m".
+ * @returns Formatted duration string (e.g., "1m 23s")
+ */
+export function useElapsedTime(
+  startTime: number,
+  isRunning: boolean,
+  ms: number = 1000,
+  pausedMs: number = 0,
+  endTime?: number,
+): string {
+  const get = () =>
+    formatDuration(Math.max(0, (endTime ?? Date.now()) - startTime - pausedMs))
+
+  const subscribe = useCallback(
+    (notify: () => void) => {
+      if (!isRunning) return () => {}
+      const interval = setInterval(notify, ms)
+      return () => clearInterval(interval)
+    },
+    [isRunning, ms],
+  )
+
+  return useSyncExternalStore(subscribe, get, get)
+}