feat(orbit): per-guest suggestion mute + global pending-cap setting

Two anti-spam knobs the host can dial during a live session:

1. Per-guest suggestion mute — Mic / MicOff toggle next to the
   kick/ban buttons in the participants popover. Symmetric (re-enable
   later). State lives in OrbitState.suggestionBlocked: string[]; the
   guest reads it and disables its own Suggest controls so the user
   sees a clear "muted" state instead of silent failures. Host-side
   sweep also drops their outbox entries as a safety net.

2. Max pending approvals cap — number input in the session-settings
   popover, default 0 (= unlimited so existing sessions are unaffected).
   When set, the host sweep stops folding new outbox entries into the
   approval list once the cap is reached. The OrbitQueueHead surfaces
   "X / Y pending" so guests can see when they're getting close.

State changes are additive on the wire — both fields are optional, with
parseOrbitState defaulting them, so older clients keep working.

evaluateOrbitSuggestGate() centralises the guest-side allow/block check
shared between useOrbitSongRowBehavior and the ContextMenu Add-to-Session
items, plus suggestOrbitTrack as a defensive last line.

i18n: en + de + fr + nl + zh + nb + ru + es.

Also fixes an earlier dedupe-key collision: the (user, trackId) cache
keys were missing their separator (NULL byte slipped in during the
previous patch), so two tracks could share a key and one of them
silently overwrite the other. Restored the space separator.

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

src/locales/de.ts

@@ -1580,6 +1580,10 @@ export const deTranslation = {
     participantsRemoveAria: '{{user}} aus dieser Session entfernen',
     participantsBanTooltip: 'Permanent bannen',
     participantsBanAria: '{{user}} permanent bannen',
+    participantsMuteTooltip: 'Vorschläge sperren',
+    participantsUnmuteTooltip: 'Vorschläge erlauben',
+    participantsMuteAria: 'Vorschläge von {{user}} sperren',
+    participantsUnmuteAria: 'Vorschläge von {{user}} wieder erlauben',
     confirmRemoveTitle: 'Aus Session entfernen?',
     confirmRemoveBody: '{{user}} wird aus der Session geworfen, kann aber jederzeit über deinen Einladungslink wieder beitreten.',
     confirmRemoveConfirm: 'Entfernen',
@@ -1605,6 +1609,12 @@ export const deTranslation = {
     settingAutoShuffleHint: 'Periodischer Fisher-Yates-Shuffle der kommenden Warteschlange. Aus: Reihenfolge wird nur verändert, wenn du selbst sortierst.',
     settingShuffleInterval: 'Alle',
     settingShuffleIntervalHint: 'Wie oft die kommende Warteschlange während der Session neu gemischt wird.',
+    settingMaxPending: 'Max offene Vorschläge',
+    settingMaxPendingHint: 'Begrenzt, wie viele Gast-Vorschläge gleichzeitig auf Bestätigung warten dürfen. 0 = unbegrenzt.',
+    pendingCounter: '{{count}} / {{max}} offen',
+    pendingCounterTooltip: 'Wartende Gast-Vorschläge / Limit',
+    suggestBlockedMuted: 'Der Host hat dich für diese Session gesperrt — keine Vorschläge möglich.',
+    suggestBlockedCap: 'Approval-Liste ist voll — warte bis der Host welche durchwinkt.',
     settingShuffleIntervalValue_one: '{{count}} Min.',
     settingShuffleIntervalValue_other: '{{count}} Min.',
     settingShuffleNow: 'Jetzt mischen',