Relative date input

## Summary
Tell us, in a few words, what the component or pattern would do.

## 💬 Description
A full description of what the component or pattern should be and how it should work.

## 💰 User value
Describe why this is important and how it will help users (either developers, designers or the end-users). Think about how it makes people's lives easier, more accessible or quicker to build stuff.

## 📚 User Stories
If relevant, describe the high-level functionality as user stories.

*As an* ICDS user:
*I need*
*So that*

## 📝 Acceptance Criteria
If relevant, describe in full detail the different interactions and edge cases that the component or patterns needs to fulfil.

*Given*
*When*
*Then*

## ✏ Designs
If there's a Figma design file (or other mock-up), include it here.

## 🧾 Guidance
If there's written guidance or documentation, include a link to it here.

## Additional info
Tell us anything else useful to help us understand your suggestion.

The issue contains only an unfilled proposal template and names no files, tests, entry points, designs, or guidance. Clarify the relative date input's behavior, user value, acceptance criteria, and implementation location before work can start or completion can be assessed.

Written by the indexing model from the issue text.