add claim absence

[135ze]

Notion Ticket

Claim Absence

Summary & Review Focus

• created claimAbsence route
• added confirmation modal before claim
• added thanks modal for claim confirmation
• edited dates to show "-th", "-st", etc

Testing Instructions

1. Edit your id so the changes are properly saved as a "real" user (eg in useUserData, return id: fetchedUserData?.id ?? not 0)
2. go to /calendar and click on an absence, then fill absence
3. ensure modal appears matching figma (https://www.figma.com/design/bTjr8nLilr2ps62RpxNAmb/Final-Designs?node-id=4-27675&m=dev)
   
4. on confirm, the absence in the calendar background should switch to show "Filled" (seen in background for may 15), and appear in "my absences" tab of calendar as well.
   
   

Checklist

• PR title is descriptive and in imperative tense
• Commit messages are descriptive, atomic, and follow best practices
• Linter(s) have been run
• Requested reviews from the PL and relevant team members

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[ChinemeremChigbo]

LGTM