[Proposal] Add Low Battery Notification by Default in ML4W-Hyprland

[adam0307a]

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Hello ML4W community 👋

I'd like to propose a small but highly useful feature for **ML4W-Hyprland**: adding **low battery notification support by default**, especially for laptop users.

This feature can be implemented easily using `systemd` and `notify-send`, without requiring any heavy dependencies. It will help prevent unexpected shutdowns due to low battery on minimal setups.

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### ✅ Features

- Sends a **critical-level desktop notification** when battery drops below **3%**.
- Compatible with common notification daemons like `swaync`, `dunst`, or `mako`.
- Runs every 5 minutes via `systemd --user timer`.
- Fully customizable (threshold, message, interval).
- Works out of the box on Hyprland and other wlroots-based compositors.

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### 🛠️ Installation Script / Instructions

Here's how it works:

1. **Install required packages**:
   ```bash
   sudo pacman -S acpi libnotify

2. Create the script file:

   mkdir -p ~/.scripts
   nano ~/.scripts/check_battery.sh

   Paste this content:

   #!/bin/bash
   PERCENT=$(acpi | grep -Eo "[0-9]+%" | head -n1 | tr -d '%')
   if [[ "$PERCENT" -lt 3 && "$PERCENT" != "" ]]; then
       notify-send -u critical "⚠️ Low Battery" "Your battery is critically low: ${PERCENT}%!"
   fi

   Save and exit (Ctrl+O, Enter, Ctrl+X), then make it executable:

   chmod +x ~/.scripts/check_battery.sh

3. Create systemd user timer:

   mkdir -p ~/.config/systemd/user/
   nano ~/.config/systemd/user/battery-check.timer

   Add the following:

   [Unit]
   Description=Run battery check every 5 minutes
   
   [Timer]
   OnBootSec=1min
   OnCalendar=*:0/5
   AccuracySec=1min
   
   [Install]
   WantedBy=default.target

   Then create the service file:

   nano ~/.config/systemd/user/battery-check.service

   Add:

   [Unit]
   Description=Battery low notification service
   
   [Service]
   Type=oneshot
   ExecStart=/home/%u/.scripts/check_battery.sh

4. Enable and start the timer:

   systemctl --user daemon-reload
   systemctl --user enable --now battery-check.timer

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🧪 Optional Enhancements

• Integrate with swaync for a better visual experience.
• Add sound alert using canberra-gtk-play or paplay.
• Show warning at 10%, critical at 3%.
• Auto-suspend or hibernate at 1%.

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💡 Why This Should Be Included

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- `enhancement`
- `feature request`
- `good first issue` (isteğe bağlı)

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[adam0307a]