Follow-up to #27009

Scope

What's changed:

• Extend each module bar button's hit area into the surrounding gap via an invisible ::before pseudo-element
• Adjacent buttons now meet at the midpoint of the gap, eliminating dead space
• No visual change — purely a click-target improvement

Potential Risks / Drawbacks

—

Tested Scenarios

• Clicks in the previously-dead gap between buttons now activate the nearer module
• Hover/active visual states remain confined to the original button shape

Review Notes / Questions

• Pattern mirrors the existing approach in module-bar-avatar.vue — kept intentionally consistent

Checklist

• Added or updated tests
• Documentation PR created here or not required
• OpenAPI package PR created here or not required

Addresses CMS-2331