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/components/ContextMenu.tsx

@@ -1449,10 +1449,10 @@ export default function ContextMenu() {
               {orbitRole === 'guest' && (
                 <div className="context-menu-item" onClick={() => handleAction(() => {
                   suggestOrbitTrack(song.id)
-                    .then(() => showToast('Suggested to session', 2200, 'info'))
-                    .catch(() => showToast('Couldn\'t suggest — not joined', 3000, 'error'));
+                    .then(() => showToast(t('orbit.ctxSuggestedToast'), 2200, 'info'))
+                    .catch(() => showToast(t('orbit.ctxSuggestFailed'), 3000, 'error'));
                 })}>
-                  <OrbitIcon size={14} /> Add to session
+                  <OrbitIcon size={14} /> {t('orbit.ctxAddToSession')}
                 </div>
               )}
               <div
@@ -1590,10 +1590,10 @@ export default function ContextMenu() {
               {orbitRole === 'guest' && (
                 <div className="context-menu-item" onClick={() => handleAction(() => {
                   suggestOrbitTrack(song.id)
-                    .then(() => showToast('Suggested to session', 2200, 'info'))
-                    .catch(() => showToast('Couldn\'t suggest — not joined', 3000, 'error'));
+                    .then(() => showToast(t('orbit.ctxSuggestedToast'), 2200, 'info'))
+                    .catch(() => showToast(t('orbit.ctxSuggestFailed'), 3000, 'error'));
                 })}>
-                  <OrbitIcon size={14} /> Add to session
+                  <OrbitIcon size={14} /> {t('orbit.ctxAddToSession')}
                 </div>
               )}
               <div