[Cal.com] Range-Limited Invitations and Direct Slot Confirmation

### Is your proposal related to a problem? At the moment, there is no simple way to generate a one-time booking link limited to that specific time window. The only workaround is to create a new specific event type and a new specific availability schedule, which quickly becomes difficult to manage and clutters the event type list. Use case: After speaking with someone, they may agree on: “I’m available 'date' between 08:00 AM and 14:00 PM.”, Similarly, there is no built-in way to send a specific proposed time slot that the recipient can simply confirm, while temporarily reserving that slot in the connected calendar. "Send me a link for 'date' at 10 AM" Because of this, scheduling ad-hoc meetings requires unnecessary configuration steps and reduces usability when coordinating meetings dynamically during conversations. This does not exist, or in full, in other apps either, giving Cal.com a competitive advantage. Schedule direct meetings, you can of course do in most calendar/meeting