Postbox refactor waves 138–276: 168-commit squash

Consolidates 137 wave commits + 31 supporting commits (CLAUDE.md bump,
typealias additions, AnyObject→EngineMedia restoration) into one squashed
commit. Migrates dozens of consumer-side public APIs, struct fields,
protocol methods, and enum payloads from Postbox protocols/structs to
TelegramEngine engine wrappers and typealiases. Drops `import Postbox`
from many files. Adds new TelegramCore typealiases and one
TelegramEngineUnauthorized facade.

Notable changes by category:

**TelegramCore typealias additions** (rule 2 — narrow utility typealiases):
- EngineChatListIndex, EngineTempBoxFile, EngineItemCollectionItemIndex,
  EngineItemCollectionViewEntryIndex, EngineValueBoxEncryptionParameters,
  EngineMessageAndThreadId, EnginePeerStoryStats, EngineMessageHistoryAnchorIndex,
  EngineChatListTotalUnreadStateCategory, EngineChatListTotalUnreadStateStats,
  EnginePeerSummaryCounterTags, EngineChatListTotalUnreadState,
  EngineItemCacheEntryId, EngineHashFunctions,
  EngineCachedMediaResourceRepresentationResult,
  EngineMediaResourceDataFetchResult, EngineMediaResourceDataFetchError,
  EngineMediaResourceStatus, EngineCachedPeerData

**TelegramCore engine extensions/forwarders**:
- EngineMessage.engineMedia, EngineMessage.enginePeers,
  EngineMessage.adAttribute, EngineMessage.effectivelyIncoming
- engineFileSize forwarder
- TelegramEngine.Resources.clearCachedMediaResources(mediaResourceIds: Set<EngineMediaResource.Id>)
- TelegramEngine.Resources.fetchStatus(id:resourceSize:)
- TelegramEngineUnauthorized.UnauthorizedResources facade with storeResourceData

**Public API/struct migrations to engine types**:
- ChatAvailableMessageActions.banAuthor/banAuthors → EnginePeer?/[EnginePeer]
- WebSessionsContextState.peers → [EnginePeer.Id: EnginePeer]
- CacheUsageStats.peers → [EnginePeer.Id: EnginePeer]
- PeerCommand.peer → EnginePeer
- PeerInfoControllerMode.calls(messages:) → [EngineMessage]
- CallControllerNodeProtocol.updatePeer → EnginePeer params
- ChatHistoryListNode.messageInCurrentHistoryView (and 4 variants) → EngineMessage?
- ChatHistorySearchContainerNode.messageForGallery → EngineMessage?
- PeerInfoPaneNode.findLoadedMessage / ensureMessageIsVisible /
  transitionNodeForGallery → engine-typed
- GalleryHiddenMediaTarget.getTransitionInfo /
  GalleryHiddenMediaManager.findTarget → engine-typed
- ChatPanelInterfaceInteraction.presentReactionDeletionOptions /
  presentBan*MessageOptions → EnginePeer
- DrawingMessageRenderer.messages → [EngineMessage]
- ChatVideoGalleryItemScrubberView.setFetchStatusSignal →
  EngineMediaResource.FetchStatus
- ChannelDiscussionGroupActionSheetItem.peer, VoiceChatPeerEntry.peer,
  VoiceChatFullscreenParticipantItem.peer, MediaStreamComponent.chatPeer,
  MediaStreamVideoComponent.callPeer, ChatMessageContactBubbleContentNode.contactPeer,
  ChatMessageForwardInfoNode.peer, ChatMessageCommentFooterContentNode.replyPeers,
  ChatReportPeerTitlePanelNode.peer, ChatMessageActionUrlAuthController.bot,
  PeerMediaCollectionInterfaceState.peer, ChatMessageCallBubbleContentNode.peopleAvatars,
  ChatLoadingNode.renderedPeer (→ EngineRenderedPeer) — all to engine types

**Wave-71-shadow stored-field migrations** (Postbox Peer/Message → Engine wrapper):
- LegacyCallControllerNode.peer
- CallStatusBarNode.currentPeer

**Dead-code / dead-field removals**:
- CallController.peer, CallControllerNodeV2.account,
  ContactMultiselectionController PeerNameIndex fields,
  preparedChatListNodeViewTransition account: Account param,
  FetchResource.swift entirely (unused function)

**Module-level Postbox import drops**: 30+ files including TelegramRootController,
EditStories, GiftViewScreen, AnimatedStickerUtils, FetchPhotoLibraryImageResource,
PeerInfoGiftsPaneNode, PeerInfoPaneContainerNode, PresentAddMembers,
PeerInfoProfileItems, ChatControllerAdminBanUsers, PresentationData typealiases,
DefaultDayPresentationTheme, ChatListViewTransition, GalleryHiddenMediaManager,
RecentSessionsController, GifContext, AuthorizationSequenceController,
PeerInfoHeaderEditingContentNode, PeerInfoHeaderNode,
PeerAllowedReactionListController, CallControllerNodeV2, and 6 PeerInfo pane files.

**AnyObject restoration**: rule 8 added (never substitute Postbox protocols
with Any/AnyObject) — undid previous AnyObject substitutions in waves 141/143
back to EngineMedia.

Doc maintenance: CLAUDE.md updated to reflect new typealiases and forwarders.

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

submodules/TelegramUI/Sources/ChatInterfaceStateContextMenus.swift

@@ -1524,7 +1524,7 @@ func contextMenuForChatPresentationInterfaceState(chatPresentationInterfaceState
         var activeTodo: TelegramMediaTodo?
         for media in message.media {
             if let poll = media as? TelegramMediaPoll, !poll.isClosed, message.id.namespace == Namespaces.Message.Cloud, poll.pollId.namespace == Namespaces.Media.CloudPoll {
-                if !isPollEffectivelyClosed(message: message, poll: poll) {
+                if !isPollEffectivelyClosed(message: EngineMessage(message), poll: poll) {
                     activePoll = poll
                 }
             } else if let todo = media as? TelegramMediaTodo {
@@ -2180,7 +2180,7 @@ func contextMenuForChatPresentationInterfaceState(chatPresentationInterfaceState
                                     guard let chatController = interfaceInteraction.chatController() as? ChatController else {
                                         return
                                     }
-                                    chatController.presentReactionDeletionOptions(author: peer._asPeer(), messageId: message.id)
+                                    chatController.presentReactionDeletionOptions(author: peer, messageId: message.id)
                                 })
                             }
                         } else {
@@ -2710,7 +2710,7 @@ func chatAvailableMessageActionsImpl(engine: TelegramEngine, accountPeerId: Peer
                 commonTags = nil
             }
             
-            return ChatAvailableMessageActions(options: reducedOptions, banAuthor: banPeer, banAuthors: banPeers, disableDelete: disableDelete, isCopyProtected: isCopyProtected, setTag: setTag, editTags: commonTags ?? Set())
+            return ChatAvailableMessageActions(options: reducedOptions, banAuthor: banPeer.flatMap(EnginePeer.init), banAuthors: banPeers.map(EnginePeer.init), disableDelete: disableDelete, isCopyProtected: isCopyProtected, setTag: setTag, editTags: commonTags ?? Set())
         } else {
             return ChatAvailableMessageActions(options: [], banAuthor: nil, banAuthors: [], disableDelete: false, isCopyProtected: isCopyProtected, setTag: false, editTags: Set())
         }