Add flexible day-of-week scheduling for post-checkout tasks

Problem Statement:

• Current task rules only support triggers like "immediately after checkout" or "X hours after checkout"
• Hosts cannot schedule tasks to run on a specific day of the week following a checkout (e.g., "the Tuesday after checkout")
• This creates operational friction when hosts want to batch certain tasks (like garbage collection) on specific days

Current Workaround:

• Hosts must manually create tasks or use recurring weekly tasks that run every Tuesday regardless of whether there was a checkout
• This leads to unnecessary tasks being created on weeks with no turnover

Impact:

• Wasted time managing tasks that aren't needed
• Confusion for cleaning teams about which tasks are actually required
• Reduced control over task scheduling flexibility

Proposed Solution:

• Add a task trigger option that allows scheduling tasks on a specific day of the week after checkout (e.g., "next Tuesday after checkout")
• This could be implemented as a new trigger type in the task rules settings

Unlock:

• Hosts can schedule tasks to run on specific days following checkout, reducing unnecessary task creation
• Cleaning teams receive only relevant tasks, improving efficiency
• Greater flexibility in managing property operations