Choose the drawn stars in one walk of the brightness order

Same stars in the same order, for less: one walk of the brightness index, reading positions laid
out in that order, sorts the view's neighbourhood, the Sun's and the rest as it goes, instead of
gathering both neighbourhoods in catalogue order and sorting them. A refocus in the page drops
from 11.3 ms to 4.6 ms (median; worst 19.1 to 7.1). This comes before the drawn set follows the
camera's turns, which makes refocusing far more frequent.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_016jxMkwA2rbicdGxHosecYi

src/app/features/galaxy-system/galaxy-system-scene.component.ts

@@ -554,7 +554,7 @@ export class GalaxySystemSceneComponent implements AfterViewInit, OnDestroy {
       (id): id is number => id !== null && id !== undefined
     ));
 
-    this.starField = new StarFieldRenderer(stars, positions, starRenderBudgetFromUrl(window.location.search), this.starsByBrightness.order);
+    this.starField = new StarFieldRenderer(stars, positions, starRenderBudgetFromUrl(window.location.search), this.starsByBrightness);
     // It has just chosen around the Sun, which is where the view opens: the first label pass need not choose again.
     this.starFieldFocus = GALAXY_OVERVIEW_TARGET.clone();
     this.galaxyGroup.add(this.starField.object);