Frontend: Can't submit application if request body is greater than 1 MB

[SheepTester]

There's a bodySizeLimit for server actions that defaults to 1 MB. But if your resume is big enough, it'll fail to submit the application, and the error is from outside the server action so it doesn't get properly reported to the user.

• Find a better way to submit the application (maybe using API routes like before) that doesn't have the same restriction
• If the server action call fails, show an error to the user