docs: expand the testing guide with frontend commands

[wunianze666-netizen]

Summary

• replace the unfinished frontend testing TODO with concrete Vitest commands
• document how to run the frontend tests from the repo root or from invokeai/frontend/web
• replace the aspirational backend organization note with a clearer description of the current state

Why

The testing guide currently exposes an unfinished TODO in the published docs. This change makes the page immediately usable for contributors who want to run frontend tests locally.

[joshistoast]

Reviewing from my phone rn, this looks fairly above board. A couple non-blockers I'd probably change though:

1. Not sure it's worth talking about where to expect the test files and then afterwards say that a lot don't follow that expectation.

2. Maybe we can mention the makefile commands we have for running the testing suite. Either as an additional set of commands or replace the mentioned ones.

[wunianze666-netizen]

Thanks for the suggestions — I've updated the guide to address both points.

• removed the frontend test location note so the section stays focused on runnable commands
• added the repo-root make shortcuts alongside the existing direct commands
• softened the backend organization note to avoid overstating the current layout

Happy to make another pass if you'd prefer a different command mix.

[joshistoast]

These look good, maybe separate the make and pnpm tests with starlight tabs and I'll approve

[lstein]

@wunianze666-netizen This is ready to go after you address @joshistoast 's request to put the docs in separate starlight tabs.

[wunianze666-netizen]

Thanks, I've separated the frontend commands into Starlight tabs:

• Make contains the repo-root shortcut
• pnpm contains the direct frontend test commands

I also rebased the branch on the latest main merge. git diff --check passes; the local docs build could not be run because this checkout does not have docs/node_modules installed.

[wunianze666-netizen]

Thanks for catching that. I added the missing Starlight component import in 0e01eae.

I also installed the docs dependencies and ran pnpm build locally; it completed successfully with all internal links valid. All PR checks, including docs / check-and-build, are now passing.

[wunianze666-netizen]

Synced the branch with the current main in f06a565. The requested Starlight component import is present, and the Make/pnpm tabs build correctly.

I reran the full docs build after the sync: 314 pages generated and all internal links valid. I also marked the now-addressed import thread as resolved. @joshistoast, could you please re-review when convenient?

[joshistoast]

lgtm