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

pyproject.toml

@@ -4,8 +4,8 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "cursor-flasher"
-version = "0.1.0"
-description = "Flash Cursor's window when the AI agent is waiting for input"
+version = "0.2.0"
+description = "Flash Cursor's window when the AI agent needs attention"
 requires-python = ">=3.10"
 dependencies = [
     "pyobjc-framework-applicationservices>=12.1",