revert(orbit): drop maxPending cap feature, keep suggestion mute

The pending counter desynced from the actual approval list (state.queue
holds approved items as history, so the count never decreased after a
host approve). The host-pushed pendingApprovalCount workaround didn't
hold up under live testing either, so we're rolling the whole cap
feature back rather than ship something flaky.

What's gone:
- OrbitSettings.maxPending + state.pendingApprovalCount
- cap branch in applyOutboxSnapshotsToState (now back to mute-only)
- maxPending number input in settings popover
- pending counter chip in OrbitQueueHead
- 'cap-reached' branch in evaluateOrbitSuggestGate / OrbitSuggestGateReason
- cap-related toasts in ContextMenu / useOrbitSongRowBehavior
- cap-related i18n keys (suggestBlockedCap, settingMaxPending*, pendingCounter*)
- cap CSS (.orbit-queue-head__pending, .orbit-settings-pop__number)

What stays: per-guest suggestion mute (works correctly) and everything
that fed into both features (OrbitState.suggestionBlocked,
setOrbitSuggestionBlocked, evaluateOrbitSuggestGate, the participants
popover Mic/MicOff toggle, the suggestBlockedMuted toast).

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

src/locales/en.ts

@@ -1613,12 +1613,7 @@ export const enTranslation = {
     settingAutoShuffleHint: "Periodic Fisher–Yates shuffle of the upcoming queue. Off: order only changes when you rearrange it.",
     settingShuffleInterval: 'Reshuffle every',
     settingShuffleIntervalHint: 'How often the upcoming queue gets reshuffled while the session runs.',
-    settingMaxPending: 'Max pending suggestions',
-    settingMaxPendingHint: 'Cap on how many guest suggestions can wait for approval. 0 = unlimited.',
-    pendingCounter: '{{count}} / {{max}} pending',
-    pendingCounterTooltip: 'Pending guest suggestions / cap',
     suggestBlockedMuted: 'The host muted you for this session — suggestions are off.',
-    suggestBlockedCap: 'Approval queue is full — wait for the host to clear some.',
     settingShuffleIntervalValue_one: '{{count}} min',
     settingShuffleIntervalValue_other: '{{count}} min',
     settingShuffleNow: 'Shuffle now',