Add to Calendar functionality when reserving a place

Description of the issue 📄

I am not sure if it has been raised before, I have been wanting to write to you for a long time, for Add to Calendar functionality, Gmail seems to recognise the .ics attachment to this email but

• it's not mentioned in the email text that there is an attachment
• the event confirmation page doesn't offer Add to Calendar

Screenshots 📷

Steps to fix 🛠

To do 📋

• Claim this issue (comment below, or assign yourself if you are part of the codebar org)
• Fork and clone the repository
• Update the relevant files. Follow the steps to fix section in this issue.
• Commit your changes as one commit. Use the title of this issue as your commit message
• Submit a pull request
• Mention this issue in the PR description by including it's number
• Have your pull request reviewed & merged by a codebar team member

Start by tracing the reservation confirmation email and confirmation page, then inspect how the existing .ics attachment is generated. Done means the email tells recipients about the attachment and the confirmation page offers an Add to Calendar action. The issue does not identify relevant files, tests, or a specific implementation path.