Add fetch metadata buttons to submissions form; add new fields

[3mcd]

Issue(s) Resolved

Resolves #56.

This PR adds specced fields to the submissions integration, including fields for Abstract (called Description in core atm), DOI, URL, and Manager's Notes. Auto-fill buttons were also added for Title, URL, and DOI fields.

Also added/changed are:

• several new shadcn/ui components and icons
• a useLocalStorage hook for client-side persistence (used to persist current submission form state)
• API_KEY env var (don't forget to update your .env.local file when testing/after merge
• example support for "*" in integration manifest files
• simplified SDK errors and better utility types

Test Plan

1. Clone locally, log in to core, and click the "Submit Pub" button at the top of the Submitted stage.
2. Enter a title, then delete it. You should see a red error message that states the Title field is required.
3. Repeat step 2 for the Abstract, DOI and URL fields. The DOI and URL fields have extra rules that ensure the strings you enter are valid identifiers.
4. Use some of the "magic wand" buttons to the right of the Title, DOI, and URL fields. They should do some basic auto-filling, and display success/error messages. Right now these buttons just perform a best guess. They haven't been tested very much!
5. Click "Submit Pub" when all the fields are valid. You should see a success message.
6. Click "Go back". You should see the new pub in the Submitted stage.

Screenshots (if applicable)

Caveats

The manager's notes field doesn't work yet, I think because there is a space/apostraphe in the field name. We'll address this when we standardize the manifest/field names/etc.

[3mcd]

Don't forget to set this in your .env.local for both core and integrations!

[gabestein]

Thanks for demoing! LGTM.