Test that a body page opens the next body on its Sun's side and turns an exoplanet for show

Two behaviours of the body page had no test. Showing a body resets the
remembered side of the equator (sunSide = 0), so the next body opens on its
own Sun's side wherever the reader left the camera; the only test that
switched bodies went from Saturn's June Sun (south) to Earth's (north),
which moves the camera with or without the reset. And the page turns an
exoplanet 0.08 radians a second for show, which no test opened.

- 'opens the next body shown on its own Sun's side, wherever the reader
  left the camera: Earth after Saturn in December': Saturn on 2032-12-01,
  the camera taken north, then Earth, whose December Sun is south too.
  Guarded mutant, the reset replaced by void 0: this test fails alone,
  "expected 0.5999999999999999 to be less than 0".
- 'turns an exoplanet slowly for show, clock or no clock': the fake loader
  now carries one exoplanet round the Sun's record; one second with the
  clock standing turns it 0.08 radians. Guarded mutant, the turn replaced
  by void deltaSeconds: this test fails alone.

The template comment said no one has measured an exoplanet's day. The app
ships two whose spin has been: 2M1207 b turns in 10.7 +1.2/-0.6 hours
(Zhou et al. 2016, ApJ 818, 176) and beta Pic b's lines are broadened by
25 +/- 3 km/s (Snellen et al. 2014, Nature 509, 63). It now says the
catalogue does not carry the day, which is what ExoplanetRecord holds.
Unit suite 869 passed.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

src/app/features/body-detail/body-detail-scene.component.ts

@@ -75,7 +75,8 @@ const SUN_SIDE_MIN_SINE = Math.sin((3 * Math.PI) / 180);
       <!-- Search, what has been kept and the clock: there is no scene readout here, the info
            panel is the reading, and the panel's own control is what keeps this body. A solar-system
            body is drawn at the clock's date and turns at its rate, so both are shown and can be set
-           here; an exoplanet, whose day no one has measured, turns for show whatever the clock says. -->
+           here; an exoplanet, whose day the catalogue does not carry, turns for show whatever the
+           clock says. -->
       <app-hud-dock [date]="date()" [clock]="true" (bookmarkChosen)="goToBookmark($event)" />
     </div>
   `