A client's first screen offers "Ask for something" on each app, opening the tell form for that app #3345

On a client's first screen (src/web/studio/client_home.ts) the only link on an app goes to its repository. A zero-technical client has no visible way to ask for a change.

Done:

• [ ] Each app row carries a link "Ask for something", which opens the existing tell form (tellHref in src/web/studio/nouns.ts) with the app already chosen.
• [ ] When the client sends it, they land back on their first screen with one line: "Sent. The agents will pick it up."
• [ ] The link uses no script, keeps the same-origin and CSRF rules of the tell form, and is hidden for a viewer who may not tell.
• [ ] Tests: the link is present for a client with tell rights and absent without them, and sending returns to / with the line. They fail without the change.

Files: src/web/studio/client_home.ts, the tell handler's redirect, test/client-home.test.ts. Builder: scout.

Parked by the crew: the check failed ("design check: nothing added outside the system (#2678) > the tree is no worse than its baseline") and the decider saw no point in another try (pull #3357 closed). Planner: split this smaller, or rewrite what done looks like; a person can also say what to try.