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/App.tsx

@@ -63,6 +63,7 @@ import ExportPickerModal from './components/ExportPickerModal';
 import AppUpdater from './components/AppUpdater';
 import TitleBar from './components/TitleBar';
 import OrbitSessionBar from './components/OrbitSessionBar';
+import OrbitStartTrigger from './components/OrbitStartTrigger';
 import { useOrbitHost } from './hooks/useOrbitHost';
 import { useOrbitGuest } from './hooks/useOrbitGuest';
 import { IS_LINUX, IS_MACOS, IS_WINDOWS } from './utils/platform';
@@ -414,7 +415,6 @@ function AppShell() {
       onContextMenu={e => e.preventDefault()}
     >
       {IS_LINUX && useCustomTitlebar && !isWindowFullscreen && !isTilingWm && <TitleBar />}
-      <OrbitSessionBar />
       {!isMobile && (
         <Sidebar
           isCollapsed={isSidebarCollapsed}
@@ -429,6 +429,7 @@ function AppShell() {
           <ConnectionIndicator status={connStatus} isLan={isLan} serverName={serverName} />
           <LastfmIndicator />
           <NowPlayingDropdown />
+          <OrbitStartTrigger />
           <button
             className="queue-toggle-btn"
             onClick={toggleQueue}
@@ -438,6 +439,7 @@ function AppShell() {
             {isQueueVisible ? <PanelRightClose size={18} /> : <PanelRight size={18} />}
           </button>
         </header>
+        <OrbitSessionBar />
         {connStatus === 'disconnected' && (
           <OfflineBanner onRetry={connRetry} isChecking={connRetrying} showSettingsLink={!hasOfflineContent} serverName={serverName} />
         )}