Restore VIP link loading state lost during merge

[Copilot]

The VIP link loading state from PR #120 was lost during subsequent merges, causing users to see an empty input field with no indication that the link was being generated asynchronously.

Changes

• Restored conditional rendering in EmbedModal component to show loading state when VIP link is empty
• Added loading message: "🔒 VIP link is being generated..." with helpful context text
• Maintains improved security warning from later commits

Implementation

// client/src/components/modal.rs
{move || {
    let link = vip_link.get();
    if link.is_empty() {
        // Show loading box with message
        view! { <div>...</div> }.into_view()
    } else {
        // Show input field with VIP link and copy button
        view! { <><input.../><button.../></> }.into_view()
    }
}}

Context

This change was originally implemented in commit 350dd58 but did not survive the merge process. The fix ensures users understand the VIP link is being fetched from the /api/project/:slug/embed-key endpoint rather than seeing a confusing empty field.

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