feat(widgets/sysmon): add an option to hide the icon

[jinliu]

Summary

Added a "Show Icon" option to sysmon's settings. When off, the icon is hidden, and the gauge is made slightly longer because it doesn't need to match the icon.

Motivation

This allows a "minimal" style where only a gauge is displayed:

Type of Change

• Bug fix
• New feature
• Breaking change
• Refactoring
• Build / packaging

Manual Coverage

• Tested on Niri
• Tested on Hyprland
• Tested on Sway
• Tested on another compositor:
• Tested with different bar positions and density settings
• Tested at different interface scaling values
• Tested with multiple monitors

Screenshots / Videos

Checklist

• This PR is ready for review, or it is marked as Draft.
• I read and followed the relevant guidance in CONTRIBUTING.md.
• I ran just format with clang-format v22+ installed, or this PR has no code changes.
• I ran the relevant build or test commands, or explained why they were not run.
• I self-reviewed the changes.
• I checked for new warnings or errors.
• I will update end-user documentation after merge, or this PR does not change user-facing configuration or behavior.
• I added or updated assets/translations/en.json, or this PR adds no new user-facing strings.
• I did not edit non-English translation files unless this PR is explicitly for translation tooling, an import/export sync, or a maintainer-requested locale change.
• I used the existing canonical names for config keys, IPC names, paths, and identifiers.

[Copilot]

Pull request overview

This PR adds a new Sysmon widget setting to optionally hide the icon, enabling a more minimal “gauge-only” style and adjusting layout sizing when the icon is not shown.

Changes:

• Added a show_icon widget setting for Sysmon and made icon-related settings conditionally visible.
• Threaded the new option through the widget factory into SysmonWidget options/state.
• Updated Sysmon layout logic to avoid reserving icon space and to lengthen the gauge/graph when the icon is hidden.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.

File	Description
src/shell/settings/widget_settings_registry.cpp	Adds show_icon and updates settings visibility rules for Sysmon.
src/shell/bar/widgets/sysmon_widget.h	Adds showIcon option and stores m_showIcon in the widget.
src/shell/bar/widgets/sysmon_widget.cpp	Skips creating/placing the icon node when disabled and adjusts layout sizing accordingly.
src/shell/bar/widget_factory.cpp	Reads show_icon from widget config and passes it into SysmonWidgetOptions.

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[ItsLemmy]

Thanks!