Put the four views in the README, and correct what one of them showed

The README described the app without showing it. Adds a screenshot to each
of the four sections it describes, captured from a real run at the current
state of the code rather than assembled or touched up.

Capturing them caught a claim that had gone stale. The galactic view's
readout still said everything inside 50 pc was real, which was true when
that string was written and has been wrong since the catalogue reached
250 pc. It now quotes the catalogue's own size and reach, so it cannot
drift again — and, usefully, that makes a stale screenshot self-evident:
the numbers are in the picture.

JPEG rather than PNG, at 1.1 MB for all four instead of about five. These
are dark scenes with fine gradients, where JPEG can band, so they were
checked at quality 88 rather than assumed to be fine.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01WaySiNst4HhDXBHnMy8p5G

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

@@ -421,8 +421,8 @@ export class GalaxySystemSceneComponent implements AfterViewInit, OnDestroy {
   }
 
   /**
-   * Blends between the two things that share parsec space: the catalogued 50 pc star field with
-   * its local grid, and the Milky Way model with its galactic one. Driven by how far the camera
+   * Blends between the two things that share parsec space: the catalogued star field with its
+   * local grid, and the Milky Way model with its galactic one. Driven by how far the camera
    * has pulled back from the Sun, so the scale ladder reports where the view already is instead
    * of switching it.
    */
@@ -572,7 +572,8 @@ export class GalaxySystemSceneComponent implements AfterViewInit, OnDestroy {
         { label: 'Arms modelled', value: `${MILKY_WAY_ARMS.length}` },
         { label: 'Catalogued', value: `${this.stars.length} stars` }
       ]);
-      this.hudNote.set('Galactic structure is an illustrative model built on measured arm geometry — no catalogue holds the Galaxy’s stars. Everything inside 50 pc is real.');
+      // Quotes the catalogue's own reach rather than a figure that has already been raised once.
+      this.hudNote.set(`Galactic structure is an illustrative model built on measured arm geometry — no catalogue holds the Galaxy’s stars. The ${this.stars.length} catalogued stars within ${LOCAL_GRID_RINGS_PC[LOCAL_GRID_RINGS_PC.length - 1]} pc are real.`);
       return;
     }