feat: mui upgraded to v7

[Liam-Zhao]

Description

Related Issue

Motivation and Context

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation Update (if none of the other choices apply)

Checklist

• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.55%. Comparing base (29df7c9) to head (2bfb1f0).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #484   +/-   ##
=======================================
  Coverage   97.55%   97.55%           
=======================================
  Files          41       41           
  Lines        4580     4580           
  Branches     1525     1525           
=======================================
  Hits         4468     4468           
  Misses        103      103           
  Partials        9        9           

Files with missing lines	Coverage Δ
src/components/job/preheats/new.tsx	97.29% <ø> (ø)
src/components/signin/index.tsx	98.38% <ø> (ø)
src/components/signup/index.tsx	98.82% <100.00%> (ø)

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[gaius-qi]

LGTM