Restructure config for per-mode style/sound and fix pulse dismiss

Major changes:
- Add StyleConfig dataclass with independent color, width, opacity,
  duration, pulse_speed, sound, and volume per mode (running/completed)
- Replace flat flash_*/sound_*/play_on config with running: and
  completed: YAML sections
- Replace CGEventTap (silently fails in forked daemon) with
  CGEventSourceSecondsSinceLastEventType polling for reliable
  input-based pulse dismissal when Cursor is already frontmost
- Update overlay, sound, and daemon to pass StyleConfig per call
- Rewrite tests for new config shape and dismiss mechanism

Made-with: Cursor

hooks/notify.py

@@ -0,0 +1,40 @@
+#!/usr/bin/env python3
+"""Cursor hook script that notifies the cursor-flasher daemon via Unix socket.
+
+Installed as a Cursor hook (preToolUse, stop) to trigger a window flash
+when the agent needs user attention. Reads hook JSON from stdin, extracts
+workspace and event info, and sends it to the daemon's socket.
+"""
+import json
+import os
+import socket
+import sys
+
+SOCKET_PATH = os.path.expanduser("~/.cursor-flasher/flasher.sock")
+
+
+def main() -> None:
+    try:
+        data = json.load(sys.stdin)
+    except (json.JSONDecodeError, ValueError):
+        return
+
+    workspace_roots = data.get("workspace_roots") or []
+    workspace = workspace_roots[0] if workspace_roots else ""
+    event = data.get("hook_event_name", "")
+    tool = data.get("tool_name", "")
+
+    msg = json.dumps({"workspace": workspace, "event": event, "tool": tool})
+
+    try:
+        s = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
+        s.settimeout(1)
+        s.connect(SOCKET_PATH)
+        s.sendall(msg.encode())
+        s.close()
+    except (ConnectionRefusedError, FileNotFoundError, OSError):
+        pass
+
+
+if __name__ == "__main__":
+    main()