Name the neighbours that have a name, before the ones that only have a number

The neighbour ring exists to say where you are. Since the catalogue refresh it
has been spending one of its four places in Sol on "Gaia DR3 5853498713190525696"
-- a nineteen-digit survey id for the star printed beside it as Proxima
Centauri, the same star twice -- and that duplicate row pushed Barnard's Star
off the ring altogether. 91.9% of the refreshed catalogue is named that way.

Named stars now come first, and survey designations fill in only where fewer
than four named ones are in reach. The line between the two is the one the
catalogue format already draws: a name is a designation when it is what the
star's source would generate for it. Judged by the prefix rather than by
rebuilding "prefix id" from the row, because the number after "Gaia DR3" is the
survey's own id, which the 32-bit row id cannot hold -- a round trip through
the id would have called every one of those stars named.

The preference lives on the index as `nearestPreferring`: the preferred pass
exhausts the search before the fill runs, so a named star is never outranked by
a nearer unnamed one. That is the whole point of asking.

The end-to-end spec names Barnard's Star again, on purpose. The four nearest
named stars to the Sun are a fact about space, not about which catalogue was
refreshed last, and without this change that is exactly the label that
vanished -- checked by running the spec with the preference stashed: it fails
on that line, and passes with it back.

npm test 609/609, npx playwright test 16/16 under CI=true --workers=2.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_014fcUfL82nvyh9VebX1Fz6w

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

@@ -18,6 +18,7 @@ import { DeepSkyRecord } from '../../shared/models/deepsky.model';
 import { ExoplanetRecord } from '../../shared/models/exoplanet.model';
 import { applyMilkyWaySkybox, createGlowSprite } from '../../shared/rendering/skybox';
 import { loadCachedTexture, MILKY_WAY_SKYBOX_PATH, SUN_TEXTURE_PATH } from '../../shared/rendering/texture-catalog';
+import { isDesignation } from '../../shared/models/star-catalog';
 import { StarRecord } from '../../shared/models/star.model';
 import { Bookmark } from '../../shared/state/bookmarks.store';
 import { NavigationStore, ViewLevel } from '../../shared/state/navigation.store';
@@ -855,7 +856,14 @@ export class GalaxySystemSceneComponent implements AfterViewInit, OnDestroy {
       // position: a neighbour whose separation rounds to what no separation prints as is not a
       // place to go, it is the same place. Compared through the formatter rather than against a
       // hand-picked epsilon, so the rule stays "would print as zero" whatever the formatter does.
-      .nearest(origin.id, NEIGHBOUR_COUNT * 2)
+      //
+      // Named stars first, survey designations only where fewer than that are in reach: a ring
+      // that exists to say where you are is not helped by "Gaia DR3 5853498713190525696" —
+      // least of all when that is the same star as the Proxima Centauri printed beside it.
+      .nearestPreferring(origin.id, NEIGHBOUR_COUNT * 2, (point) => {
+        const star = this.starsById.get(point.id);
+        return star !== undefined && !isDesignation(star);
+      })
       .filter((neighbour) => formatParsecs(neighbour.distancePc) !== formatParsecs(0))
       .slice(0, NEIGHBOUR_COUNT)
       .flatMap((neighbour) => {