AI desktop page: strip unpicked optional sections like the skill does

The merged AI desktop page check filled the no-AI template directly and hit
{{CHECKPOINTS_JSON}}. It now runs sections.py with none picked first. No-AI step 6
names the sections.py run, and the AI skill says how its desktop and web paths get
the checkpoint, admin and login sections.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

rpa-dashboard-ai/SKILL.md

@@ -70,6 +70,9 @@ pane, the approve gate and the cost page. Ask which extras to add (choose any, o
 **checkpoint tracker**, **admin/roles screen**, **login page**, **model picker** (choose
 the model per batch), **retry on another model** (for failed runs). Build only the
 chosen ones at their `OPTIONAL:` markers, and delete the markers.
+- **Checkpoint tracker, admin/roles, login:** web: port them from `<no-ai>dashboard.html`'s
+  `OPTIONAL:` blocks. Desktop: they're already in the no-AI page; `<no-ai>sections.py` keeps
+  the chosen ones (no-AI step 6), and `<no-ai>sections.md` says what each needs from the host.
 - **Model picker:** a `<select>` filled from `GET /models` (the pricing table's keys), at
   the marker in `Cost.tsx` (desktop: `ai_sections.html`) or next to the Run button; the chosen model goes with the
   batch's start action. Remember the last choice per user.