Task: Audit B-connex UI/UX for Mobile Menu Navigation and General Architecture Issues

Here is the current structure of the layout files:

1. app/Views/partials/topbar.php:
```php
<header class="bcx-topbar">
    <div class="bcx-topbar-left">
        <a class="bcx-brand-link" href="/">
            <span class="bcx-logo sm"></span>
            <span><?= $app_name ?></span>
        </a>
        <nav class="bcx-topnav">
            ...
        </nav>
    </div>
    <div class="bcx-topbar-right">
        ... Signout / Signin buttons
    </div>
</header>
```

2. app/Views/partials/sidebar.php:
```php
<aside class="bcx-sidebar">
    <!-- Section groups and navigation links -->
</aside>
```

3. app/Views/layouts/main.php:
```php
<div class="bcx-shell">
    <?= View::partial('topbar', ...) ?>
    <div class="bcx-main">
        <?= View::partial('sidebar', ...) ?>
        <main class="bcx-content">
            <?= $_content ?>
        </main>
        <?= View::partial('rightpanel', ...) ?>
    </div>
</div>
```

4. Relevant CSS Rules in public/assets/css/app.css:
```css
.bcx-main {
    display: grid;
    grid-template-columns: 240px 1fr 320px;
}
.bcx-sidebar {
    background: var(--bg-2);
    border-right: 1px solid var(--line);
}
@media (max-width: 1100px) {
    .bcx-main {
        grid-template-columns: 220px 1fr;
    }
    .bcx-rightpanel {
        display: none;
    }
}
@media (max-width: 1024px) {
    .bcx-topnav {
        display: none;
    }
}
@media (max-width: 760px) {
    .bcx-main {
        grid-template-columns: 1fr;
    }
    .bcx-sidebar {
        display: none;
    }
}
```

Findings:
The user reported issues with menu navigation in mobile view. Currently, under 1024px the topnav hides (`display: none;`), and under 760px the sidebar also hides (`display: none;`). There is no hamburger menu button, mobile header menu, or navigation drawer to allow users on mobile or tablet views to navigate between different pages of B-connex (like campaigns, leads, billing, etc.).

Action Required:
Provide a detailed report analyzing this issue and recommend structural changes to resolve it. Also, provide a general code audit with rationales on potential issues, improvements, and functionality additions for B-connex.

Format the output as a clean Markdown document covering:
1. Analysis of the Mobile Navigation issue (specifically what CSS classes are hidden and why navigation is blocked).
2. Proposed design/code fix (HTML changes in topbar.php / main.php, CSS classes to add to app.css, and JS toggle logic in app.js).
3. General code audit of B-connex: identify other potential layout or code issues.
4. Rationales for UX/functional improvements or additions to B-connex.