# Tweaks: approval filtering + two flash modes

## Task
Added tool filtering and differentiated flash behavior for approval vs. completion events.

## Changes
- **`config.py`**: Added `approval_tools` list (default: Shell, Write, Delete), `sound_name`/`sound_volume`, `pulse_speed`
- **`overlay.py`**: Two modes — `pulse()` with sine-wave animation + auto-dismiss when Cursor is focused, `flash()` for brief single flash
- **`daemon.py`**: Routes `preToolUse` to pulse+sound (filtered by approval_tools), `stop` to brief flash; stop dismisses active pulse
- **`sound.py`**: Re-added for approval pulse events
- **Tests**: 19 tests covering tool filtering, both flash modes, cooldown, fallback behavior
- **`README.md`**: Documented both behaviors and config options

## Behavior
| Event | Tool in approval_tools? | Action |
|-------|------------------------|--------|
| preToolUse | Yes (Shell, Write, Delete) | Pulse border + play sound until user clicks window |
| preToolUse | No (Read, Grep, etc.) | Ignored |
| stop | N/A | Brief single flash |