fix(web): allow deleting non-empty projects from the warning toast

[maria-rcks]

What Changed

Adds a Delete anyway button to the Project is not empty warning toast.

Clicking it closes the toast, asks for confirmation, then deletes the project's threads and removes the project.

closes #665

Why

Right now the warning blocks project deletion without giving you a way to continue.

This keeps the fix small and makes the warning actionable.

Video

Screen.Recording.2026-03-20.at.9.56.38.PM.mov

Note

Allow deleting non-empty projects via a warning toast with inline 'Delete anyway' action

• When a user removes a project that contains threads, a warning toast now appears with a 'Delete anyway' button instead of blocking the action. Clicking it confirms, deletes all threads in the project, then removes the project.
• Introduces a removeProject callback in Sidebar.tsx that consolidates project deletion logic (clearing drafts, dispatching the delete command) used by both empty and non-empty project flows.
• Extends the toast data shape in toast.tsx with actionLayout and actionVariant to support inline destructive action buttons and stacked layouts in both Toasts and AnchoredToasts.

^{Macroscope summarized f74b447.}

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