Replaces the 'copy to clipboard' action with a direct 'Request a Quote' via WhatsApp. This streamlines the process for
users to submit their event order details.
- The 'Request a Quote' button now opens a pre-filled WhatsApp message to a designated contact number.
- A new `buildMessage` computed property is created in the `eventOrder` composable to generate a detailed quote request
message.
- Adds support for tracking referrers via a `?referer` URL query parameter, which is included in the final message.
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