A Launch that waits on the person opens a dialog; press outcomes reach the notice stack #279

Problem

When a Launch press needs the person's answer, or cannot go on, the generator says so only in the short line beside the launch control:

• A first Launch prepares a model check and then waits for its charge to be approved. The only Approve is a small word in that line. A person who does not look there sees a Launch that seemingly did nothing; pressing it again refuses with "Approve or cancel the model check first." without showing where.
• A Launch press whose session review differs from what the panel showed, or whose model check changed the profile, stops with the explanation in the same line.
• A refused Launch press only shakes the control and repeats the reason in the readout.
• Outcomes and failures of a press (launched, resumed, saved, a check that stopped, a failed step) are said only in that line and to screen readers.

These are easy to miss, and nothing guides the person to the answer the panel waits for.

Change

• A dialog for every press that waits on the person. A modal dialog names what the press waits on, why, and the choices:
  • a model check's charge: the requests in all and per provider, Approve and launch (or Approve for a check started on its own), Cancel;
  • a reviewed session that differs from what the panel showed: what differs, Launch it, Not now;
  • a model check that changed the profile: the settings it moved, Launch, Not now;
  • a refused Launch press: the reason, why it applies, the one-press fixes the launch line offers, Close.
• Esc and the backdrop take the dialog's way out (Cancel, Not now, Close), which never spends or launches. The dialog opens with focus on its title, so a key typed for something else never answers it; the second click of a double click and a press in the first moments after it opens are ignored.
• The dialog is the only place a waiting charge is approved: the launch line and the Models sheet no longer carry Approve.
• Notices for outcomes. Launched, resumed, saved, a model check the person started that finished or stopped, and a failed step are also posted to Manifold's one notice stack.

Acceptance

• A first Launch whose check prepares a charge opens the dialog with the charge; approving spends exactly that charge once and goes on to the launch; Cancel, Esc or the backdrop spend nothing.
• A double click on Launch, key repeat, or Enter while the dialog's title has focus never approves.
• A Launch press whose review differs opens the dialog with what differs; Launch it launches that reviewed session; Not now drops it, and the next press reviews again.
• A refused Launch press opens the dialog with its reason and fixes; a fix applies and closes it.
• Launch and resume outcomes and press failures appear in Manifold's notice stack.
• Pointer and keyboard both work; 170 to 1440 px wide with no sideways scroll; reduced motion respected; nothing in the panel moves when the dialog opens or closes.
• scripts/gate.sh passes, including the real-browser verifier.