[TheGreatAxios]

What changed

A project with no model provider showed an error banner in place of the composer. The composer now stays, disabled, with a highlighted Enable AI button in place of Send. It opens the provider tiles from the model setup screen in a dialog, so connecting never leaves the project; once connected, the coordinator starts.

• model-setup.tsx: the tiles move into ProviderTiles, shared by ModelSetup and the new EnableAiDialog.
• workspace/index.tsx: banner removed; its Open Settings action was the only use of onOpenSettings, so that prop goes too.

How it was verified

• bun run test: 217 passed, 0 failed.
• bun run lint, bun run format:check, bun run typecheck: passed.
• In the app with no provider: Enable AI shows in the composer, opens the dialog, and an API-key tile opens the key prompt over it. A real connection was not exercised.

[corbits-triage]

Triage: Fail

@TheGreatAxios, please address the following:

• pull request does not reference an issue

Triage will comment, close.

[corbits-triage]

Open an issue for this change first, then a pull request that links it.