add password mode to hide/reveal text in NTextInput

[gokomer]

Pull Request

Motivation

I couldn't find a way to mask password/api keys so this adds a password mode to the NTextInput widget, allowing it to mask input characters. Includes an optional toggle button to show/hide the password. I find it useful for plugins require password or api keys.

Type of Change

• Bug fix
• New feature
• Breaking change
• Refactoring

Testing

Describe how you tested your changes and mark the relevant items.

• Tested on niri
• Tested on Hyprland
• Tested on sway
• Tested with different bar positions and density settings
• Tested at different interface scaling values
• Tested with multiple monitors (if applicable)

Screenshots / Videos

Checklist

• Code follows project style guidelines
• Self-reviewed my code
• No new warnings or errors
• Documentation or comments updated (if relevant)

Additional Notes

Three new properties are exposed on NTextInput:

• passwordMode -> enables masked input
• passwordVisible -> tracks current visibility state
• showPasswordToggle -> shows/hides the eye icon button

Translation keys common.show-password and common.hide-password were added to en.json.