Finalize First Iteration of the Testing Suite

[garrettmflynn]

This PR completes the first iteration of a testing suite for commoners (#2).

Notably, this doesn't test the following conditions yet:

1. Electron Build — When run through vitest, electron-builder is blocked and breaks because of an stdio error—although a manual build works.
2. Electron Start — electron-vite was not accepting different roots, so a secondary testing command (test:electron) was created to temporarily bypass this limitation. However, it was found that we cannot request the debugURL from Puppeteer because of a CORS error, so there is no ability to control that window (i.e. run E2E tests) or quit the app when complete.
3. Mobile — Both mobile build and start have not been approached in this PR because of less usage and the lack of a good E2E testing strategy.

Based on the new testing workflow and setting in GitHub, all PRs merging to main must now pass this suite.