feat: update application flow (#287)

[jeessh]

Implementation description

• added a tooltip notification to warn the user of impending deadline (1 hour before, 5 minute grace period, end)

• blocked submissions when the grace period ends, with a modal explaining the window has closed

• kept the form alive through the grace period for anyone who started before the deadline, so refreshing no longer kicks them out (new visitors still get denied)

• persisted in-progress answers to sessionStorage so a refresh keeps the form filled, which is cleared on successful submit

• added a confirmation modal before submitting, since applications can't be edited afterwards

• added an error message when a resume submission fails

• ui changes (select dropdown, goofy left border, resume upload button, cursor pointers)

• also ran linter and some other stray files got linted who didnt run their linters >:c

Steps to test

1. change the application deadline to change states
2. test that submissions work/get rejected depending on the state

What should reviewers focus on?

• AppForm.tsx lowkey the most important one, rest are building blocks to it or small ui changes

Checklist

• My PR name is descriptive and in imperative tense
• My commit messages are descriptive and in imperative tense. My commits are atomic and trivial commits are squashed or fixup'd into non-trivial commits
• I have run the appropriate linter(s)
• I have requested a review from the PL, as well as other devs who have background knowledge on this PR or who will be building on top of this PR

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