Fix navigation menu visibility issue on desktop screens

[dohyeondk]

Description

This PR fixes the intermittent navigation menu visibility issue reported in #1009.

Problem

Navigation menu items were sometimes invisible on desktop screens (width > 992px) due to a CSS rule that set opacity: 0 on nav items before the dropdown JavaScript loaded. If the JavaScript failed to load or was delayed, the menu items would remain invisible.

Solution

Removed the problematic media query that was hiding navigation items:

@media (min-width: 992px) {
    body:not(.is-dropdown-loaded) .gh-head-menu .nav > li {
        opacity: 0;
    }
}

This ensures navigation menu items are always visible regardless of JavaScript loading state.

Changes

• Removed opacity transition dependency on .is-dropdown-loaded class
• Updated compiled CSS files (screen.css, screen.css.map)

Testing

• Tested on desktop screens (width > 992px)
• Verified navigation items are now always visible
• Confirmed no visual regressions

Fixes #1009

---

Note

Removes the CSS rule that hid desktop nav items before dropdown init, ensuring the menu is always visible, and updates the built CSS and source map.

• CSS (navigation):
  • Remove media query in assets/css/screen.css that set opacity: 0 for .gh-head-menu .nav > li on desktop when body:not(.is-dropdown-loaded).
• Build outputs:
  • Regenerate assets/built/screen.css and assets/built/screen.css.map to reflect the change.

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