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/locales/en.ts

@@ -1438,4 +1438,86 @@ export const enTranslation = {
     liveSearch: 'Live',
     randomAlbumsLabel: 'Random Albums',
   },
+  orbit: {
+    triggerLabel: 'Psy Orbit',
+    triggerTooltip: 'Start a shared listening session',
+    closeAria: 'Close',
+    heroTitlePrefix: 'Listen together with',
+    heroTitleBrand: 'Psy Orbit',
+    heroSub: 'Start a session — other users on {{server}} will listen along and can suggest tracks.',
+    fallbackServer: 'this server',
+    tipLan: "You're currently connected via a home-network address. Guests outside your network can't join — switch to a public server address in settings before you start.",
+    tipRemote: 'For guests outside your home network to join, your server address has to be publicly reachable. If your server is internal only, switch before you start.',
+    factSameServer: 'Only users signed in to the same server can join.',
+    factHost: "You're the host — you control playback, your guests suggest tracks.",
+    factShuffle: 'The queue is reshuffled automatically every 15 minutes.',
+    labelName: 'Session name',
+    namePlaceholder: 'Velvet Orbit',
+    reshuffleTooltip: 'New suggestion',
+    reshuffleAria: 'Suggest a new name',
+    helperName: 'How the session shows up to your guests — keep it or type your own.',
+    labelMax: 'Max guests',
+    helperMax: "You don't count — this only caps incoming guests.",
+    labelLink: 'Invite link',
+    tooltipCopied: 'Copied',
+    tooltipCopy: 'Copy',
+    ariaCopyLink: 'Copy invite link',
+    helperLink: 'Send this link to your guests. They can paste it anywhere in Psysonic with Ctrl+V.',
+    btnCancel: 'Cancel',
+    btnStarting: 'Starting…',
+    btnStart: 'Start Orbit',
+    btnCopyAndStart: 'Copy link & start',
+    errNameRequired: 'Please give your session a name.',
+    errStartFailed: "Couldn't start.",
+    hostLabel: 'Host: {{name}}',
+    participantsTooltip: 'Participants',
+    settingsTooltip: 'Session settings',
+    shuffleLabel: 'Queue reshuffles in',
+    catchUpLabel: 'catch up',
+    catchUpTooltip: "Jump to the host's current position",
+    endTooltip: 'End session',
+    leaveTooltip: 'Leave session',
+    participantsInviteLabel: 'Invite link',
+    participantsCountLabel: '{{count}} in session',
+    participantsHost: 'host',
+    participantsEmpty: 'No guests yet',
+    participantsKickTooltip: 'Remove from session',
+    participantsKickAria: 'Remove {{user}}',
+    settingsTitle: 'Session settings',
+    settingAutoApprove: 'Auto-approve suggestions',
+    settingAutoApproveHint: "Guest suggestions land in your queue instantly. Off: they stay in the session list for you to review later.",
+    settingAutoShuffle: 'Reshuffle queue every 15 minutes',
+    settingAutoShuffleHint: "Automatic Fisher–Yates shuffle. Off: the order only changes when you rearrange it.",
+    settingShuffleNow: 'Shuffle now',
+    toastSuggested: '{{user}} suggested "{{title}}"',
+    toastSuggestedMany: '{{count}} new suggestions in the queue',
+    toastShuffled: 'Queue shuffled',
+    toastJoined: 'Joined session',
+    toastLoginFirst: 'Log in before joining a session',
+    toastSwitchServer: 'Switch to {{url}} first, then paste again',
+    toastJoinFail: "Couldn't join session",
+    joinErrNotFound: 'Session not found',
+    joinErrEnded: 'Session has ended',
+    joinErrFull: 'Session is full',
+    joinErrKicked: "You can't rejoin this session",
+    joinErrNoUser: 'No active server',
+    joinErrServerError: "Couldn't join",
+    ctxAddToSession: 'Add to Orbit session',
+    ctxSuggestedToast: 'Suggested to the session',
+    ctxSuggestFailed: "Couldn't suggest — not joined",
+    guestLive: 'Live',
+    guestPlaying: 'Playing now',
+    guestPaused: 'Paused',
+    guestLoading: 'Loading…',
+    guestSuggestions: 'Suggestions',
+    guestHost: 'Host: {{name}}',
+    guestSubmitter: 'by {{user}}',
+    guestEmpty: 'No suggestions yet. Open a track\'s context menu and pick "Add to Orbit session".',
+    guestFooter: "The host controls playback — you can't change the list.",
+    exitKickedTitle: 'You were removed from the session',
+    exitEndedTitle: 'The host ended the session',
+    exitKickedBody: '{{host}} removed you from "{{name}}".',
+    exitEndedBody: '"{{name}}" has ended. Hope you had fun.',
+    exitOk: 'OK',
+  },
 };