chore(orbit): rename "Psy Orbit" → "Orbit" in user-visible strings

Topbar trigger button + start-modal hero brand both drop the "Psy"
prefix. Help-section copy and the settings toggle that references the
button by name are renamed in lockstep so the UI stays consistent —
otherwise the settings row would still read "Show Psy Orbit in the
header" while the actual button reads "Orbit". 8 locales updated.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/store/authStore.ts

@@ -61,7 +61,7 @@ interface AuthState {
   showArtistImages: boolean;
   showTrayIcon: boolean;
   minimizeToTray: boolean;
-  /** Whether the "Psy Orbit" topbar trigger is rendered. Users who never
+  /** Whether the "Orbit" topbar trigger is rendered. Users who never
    *  touch Orbit can hide it so the header stays uncluttered. */
   showOrbitTrigger: boolean;
   discordRichPresence: boolean;