exp(orbit): host merge, guest queue view, settings popover, i18n

Guest suggestions now auto-merge into the host's play queue at random
positions inside the upcoming range, so they actually surface alongside
host-picked tracks instead of piling up at the end. Per-item dedupe via
addedBy:addedAt:trackId keys survives reshuffles.

Guests get a read-only mirror of the session in place of their queue
panel — live-card for the host's current track, suggestion list with
submitter attribution, and a footer reminding them the host owns
playback. Track metadata is resolved lazily and cached locally.

New host-only settings popover (gear in the bar) with auto-approve and
auto-shuffle toggles plus a "Shuffle now" action. Settings live in the
OrbitState blob and push immediately to Navidrome; missing fields on
older blobs default to "both on".

15-min shuffle now touches the real playerStore queue via a new
shuffleUpcomingQueue action — previous behaviour only reshuffled the
guest-facing suggestion history. A manual shuffle is available from the
settings popover so the interval can be verified without waiting.

Start-modal reworked into a single step: share-link is visible and
copy-able from the start, auto-copied on Start if the host hasn't
already hit Copy. Link carries a live name-derived slug (parser strips
it, SID is authoritative). LAN/remote-server hint above the facts.
Random session-name suggester pulls from three pattern pools for ~10k
unique combinations.

All user-visible Orbit strings moved to a dedicated orbit i18n
namespace (en + de); other locales fall back to en via i18next.

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

src/api/orbit.ts

@@ -78,8 +78,26 @@ export interface OrbitState {
   kicked: string[];
   /** Set when the host has ended the session; guests should exit on next poll. */
   ended?: boolean;
+  /** Host-settable session rules; absent on older clients — treat missing as all-defaults. */
+  settings?: OrbitSettings;
 }
 
+/**
+ * Host-configurable rules. All default to `true`, i.e. the feature runs
+ * "all on" for new sessions. Toggled via the Orbit-bar settings popover.
+ */
+export interface OrbitSettings {
+  /** Guest suggestions go straight into the host's play queue. */
+  autoApprove: boolean;
+  /** Queue is reshuffled every `ORBIT_SHUFFLE_INTERVAL_MS`. */
+  autoShuffle: boolean;
+}
+
+export const ORBIT_DEFAULT_SETTINGS: OrbitSettings = {
+  autoApprove: true,
+  autoShuffle: true,
+};
+
 /** What the guest's outbox-playlist comment holds (heartbeat only, for now). */
 export interface OrbitOutboxMeta {
   /** Wall-clock ms of this heartbeat. */
@@ -117,6 +135,7 @@ export function makeInitialOrbitState(args: {
     lastShuffle: now,
     participants: [],
     kicked: [],
+    settings: { ...ORBIT_DEFAULT_SETTINGS },
   };
 }