Open a scene framed, and thin out two inspector sections (#295)

Three small things asked for in one issue. A scene came up wherever
the view happened to stand, and the inspector carried a button and a
list that are better reached somewhere else.

- A scene comes up framed as if Fit had been clicked: after a
  project is loaded and when another scene is opened. From then on
  the view belongs to the user.
- An empty scene has nothing to frame and stands at the origin, one
  pixel per unit. A scene the running game loads is not framed anew.
- The Container tab is left out. It keeps the view of each container
  as before (#171).
- The Unpack button and the two lines under it are gone from the
  inspector of a placed container. Unpack container stays in the
  right-click menu of the hierarchy and of the scene view.
- The corners of a polygon collider are no row in the inspector any
  more. They are edited on the outline in the scene view. The new
  schema option noRow keeps a property out of the inspector while it
  stays a property.

Tests:
- Gate on melektaus-atx: 219 files, 3401 tests, CHECK EXIT 0.
- One new unit test in tests/core/polygon.test.ts: the corners are
  a property of the collider and no row.
- Three new e2e checks: a loaded project is framed like Fit (module
  03), an opened scene is (04), and after a real reload a click on
  Fit moves nothing (09).
- Module 09 unpacks through the right-click menu now and checks that
  the inspector offers no button.
- Full suite on melektaus-atx: 1695 checks, all pass. Smokes 24, 19
  and 21, all pass.
- No counter-probe evaluated, and nothing looked at after the build.

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

tests/core/polygon.test.ts

@@ -21,6 +21,7 @@ import {
   shapeContains,
   shapesOverlap,
 } from '../../src/core/properties/collider';
+import { defaultsFor, isRowShown, schemaFor } from '../../src/core/properties/PropertySchema';
 import { gripAt, withCornerAfter, withCornerMoved, withoutCorner } from '../../src/editor/polygonEdit';
 
 const P = (...xy: number[]) =>
@@ -265,6 +266,14 @@ describe('editing an outline by its corners', () => {
     expect(withoutCorner(P(0, 0, 1, 0, 0, 1), 0)).toBeNull();
     expect(withoutCorner(P(0, 0, 1, 0), 0, 0)).toEqual(P(1, 0));
   });
+
+  it('the corners are a property of the collider, but no row in the inspector (#295)', () => {
+    const collider = schemaFor('collider');
+    expect(collider.map((d) => d.key)).toContain('points');
+    expect(defaultsFor('collider').points).toHaveLength(3);
+    for (const shape of ['box', 'polygon'])
+      expect(collider.filter((d) => isRowShown(d, { shape })).map((d) => d.key)).not.toContain('points');
+  });
 });
 
 /** A ring as a set of corners, whichever corner it starts at and whichever way it runs. */