Simplify 3D print export

[Aymericr]

What does this PR do?

Replaces the configurable print-export card with one Export 3D print files action. The action keeps the validated 3MF, 1:100, per-level architectural-structure profile internal and still blocks downloads when preflight reports invalid geometry.

Traditional GLB, STL, and OBJ exports are unchanged.

How to test

1. Open Settings and confirm GLB, STL, OBJ, and one Export 3D print files button are present.
2. Confirm no print scale, format, content, base, or output controls are shown.
3. Run bun check, bun run check-types, bun run test, and bun run build.

Screenshots / screen recording

Locally verified at 1440 x 1000 against the production build.

Checklist

• Tested locally against the production build
• My code follows the existing code style (bun check)
• Relevant behavior is covered by focused and full tests
• This PR targets the main branch

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Note

Low Risk
UI-only simplification of print export options; exporter and preflight still gate downloads. No auth or data-handling changes.

Overview
Replaces the configurable print-export card with one Export 3D print files button in Settings.

The action always uses a fixed profile: 3MF, 1:100, per-level structure, no plinth. Preflight still runs first; blocked geometry (including per-level errors) prevents download and shows the diagnostic. GLB/STL/OBJ exports are unchanged.

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