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>

tools/e2e/03-play.mjs

@@ -402,6 +402,20 @@ export async function play(t) {
     const { ok, detail } = await sameAsGame(label);
     check(`Fit in the scene tab shows the world exactly as the game view does at ${label}`, ok, detail);
   }
+  // 3i. A project that is loaded brings its scene up framed the same way, without the click (#295).
+  //     The scale still stands at Fit, so the framed view is not the one a bare reset would give.
+  const gameAtFit = await json(`__gm.gameRect('o1')`);
+  await showTab('scene');
+  await evaluate('__gm.lookAt(5000, 5000)');
+  await evaluate('__gm.state.loadProject(__gm.state.project, __gm.state.revision)');
+  await showTab('scene');
+  const sceneOnLoad = await json(`__gm.objectRect('o1')`);
+  check(
+    'a loaded project shows its scene framed like Fit, without a click',
+    Boolean(sceneOnLoad) && ['x', 'y', 'w', 'h'].every((k) => Math.abs(sceneOnLoad[k] - gameAtFit[k]) < 0.01),
+    JSON.stringify({ gameAtFit, sceneOnLoad }),
+  );
+  await showTab('game');
   g = await pickScale('100%');
   check('and 100% can be picked back', g.mode === 1 && g.scale === 1, JSON.stringify(g));
   await showTab('scene');