Fix: Taskbar overflows a little bit on smart width

[jinliu]

GridLayout.columnSpacing was not accounted when calculating the auto width.

Type of Change

Mark the relevant option with an "x".

• 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)

Checklist

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

[Copilot]

Pull request overview

Fixes a minor taskbar width overflow when smartWidth is enabled by accounting for GridLayout.columnSpacing in the per-entry width calculation used to clamp title width.

Changes:

• Adjusts the smart-width per-entry width calculation to include spacing between entries.

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