fix: date bug

[fvcci]

fix the bug where users do not fill anything out for Graduation Year field and it gives them invalid date error.

Summary by CodeRabbit

• Bug Fixes

  • Improved handling of date fields in application forms to ensure consistent user experience.
  • Updated default data initialization logic for the expected graduation date.

• Refactor

  • Streamlined date conversion processes in both client-side and server-side code.
  • Adjusted application validation logic to directly validate string inputs for dates.

• Documentation

  • Internal documentation updated to reflect changes in date handling and validation.

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[coderabbitai[bot]]

Walkthrough

## Walkthrough The project has undergone a shift in handling date fields, moving from processing and validating dates as `Date` objects to using string representations directly. This change affects form inputs, validation schemas, and server routers, streamlining the handling of birthday and expected graduation dates across the application lifecycle. The update simplifies the data flow by removing unnecessary conversions and aligns the backend and frontend date formats. ## Changes | Files | Change Summary | |-----------------------------------------|----------------| | `src/components/Applicant.tsx` | Updated `FormInput` components for `birthday` and `studyExpectedGraduation` to use string data directly. | | `src/pages/apply.tsx` | Removed `studyExpectedGraduation` from `defaultValues` in `ApplyForm`. | | `src/schemas/application.ts` | Changed validation for `birthday` to direct string input; updated `studyExpectedGraduation` type to string. | | `src/server/router/application.ts` | Streamlined date assignment in `applicationRouter` by using ISO string slices for `birthday` and `studyExpectedGraduation`. | | `src/server/router/reviewers.ts` | Introduced `ApplicationSchemaWithStringDates` for date strings; updated `reviewerRouter` to use the new schema for output. |

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