i18n(it): address code review findings

Localize a bootstrap shot title without a source pack only when the
Nepal pack marker binds that title to the shot's id, so an operator
shot renamed to a bootstrap title in the built-in scene stays as typed.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

src/scenes/sceneTitleDisplay.test.mjs

@@ -155,11 +155,23 @@ test('bootstrap shots of a built-in scene localize without a source pack', () =>
   );
   if (!scene) return;
   for (const { title } of bootstrap.cameraPath) {
-    // The upgrade copies these keyframes into the scene without sourcePackId.
+    // The upgrade copies these keyframes into the scene without sourcePackId
+    // and binds each title to its shot in the pack marker.
+    const upgraded = {
+      id: scene.id,
+      appliedShotPacks: [
+        { id: append.id, version: 1, shotBindings: { [title]: 'shot-old' } },
+      ],
+    };
     assert.equal(
-      displayShotTitle(title, { id: 'shot-old', title }, { id: scene.id }),
+      displayShotTitle(title, { id: 'shot-old', title }, upgraded),
       displayShotTitle(title),
     );
+    // Another shot the operator gave the same title stays as typed.
+    assert.equal(
+      displayShotTitle(title, { id: 'shot-user', title }, upgraded),
+      title,
+    );
     // The same title in an operator's own scene stays as typed.
     assert.equal(
       displayShotTitle(title, { id: 'shot-user', title }, { id: 'scene-user' }),