Your apps, one line each: the studio home's rows and its empty state #522

An app row's description is now one clamped line with an ellipsis, and a person with no apps gets a next step. test/studio.test.ts passes, 157 tests. I did not run the rest of the forge.json check. bun x tsc --noEmit fails here with "Cannot find type definition file for 'bun'", so types are unchecked.

• Clamp: the shared row in src/web/studio/shelf.ts now puts the description and the row's facts in separate spans. In src/web/studio/style.ts the description is one line with an ellipsis. The facts (live or not, who moved it last and when) don't shrink, so a long description can't push them out. On a phone the description takes its own line and the facts wrap beneath it. The full text stays in the row's title, as before. Nothing is truncated server-side. The /apps list picks this up when it uses these rows.
• Stranger's shelf: its tiles already ellipsised the description. I added the title with the full text, which they lacked.
• Empty state: src/web/studio/home.ts now shows New app (/apps/new) and a Repositories button (/?mode=dev).
• Tests:

- A new test gives a repo a 400-character description. It checks that the row's title holds all of it, that it sits in the clamped shelf-desc span, and that the facts are outside that span. - The empty-state test also asserts the /?mode=dev link. - I changed the byte-exact shelf row test, because I changed the row's markup on purpose. - Nothing asserts that the CSS clamp itself applies.

• Dev unchanged: I did not change the shared row() in src/web/ui.ts. The new markup and CSS exist only on the studio shelf, so dev's lists render as before.
• Not done: I did not edit #28's acceptance lines; those two lines landed here, so the front-door flip is only the flip. I did not truncate on the server.

To try it, open / signed in with an app whose description is long, then with an account that has no apps.

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Closes #69