feat(ios): add share to support (#15340)

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

* **New Features**
  * Added iOS sharing for URLs, text, web pages, and images.
* Shared content can be reviewed, titled, and saved to an AFFiNE
workspace.
  * Choose destinations including workspaces, tags, and collections.
* Added previews, attachment handling, import status, retry support, and
success/error feedback.
* Pending shares are processed when AFFiNE opens or returns to the
foreground.
* **Bug Fixes**
* Improved workspace profile handling across different workspace types.
* Onboarding completion is now recorded immediately after successful
sign-in verification.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

---------

Co-authored-by: DarkSky <25152247+darkskygit@users.noreply.github.com>

packages/frontend/apps/ios/App/Shared/ShareInbox/ShareInboxModels.swift

@@ -0,0 +1,82 @@
+import Foundation
+
+struct ShareInboxAttachment: Codable, Equatable {
+  var fileName: String
+  var mimeType: String
+  var relativePath: String
+}
+
+enum ShareInboxContentKind: String, Codable {
+  case url
+  case text
+  case image
+}
+
+struct ShareInboxContent: Codable, Equatable {
+  var kind: ShareInboxContentKind
+  var url: String?
+  var text: String?
+}
+
+struct ShareInboxTarget: Codable, Equatable {
+  var workspaceId: String
+  var workspaceFlavour: String
+  var tagIds: [String]
+  var collectionId: String?
+}
+
+struct ShareInboxResult: Codable, Equatable {
+  var docId: String
+  var committedAt: Date
+}
+
+struct ShareInboxItem: Codable, Equatable, Identifiable {
+  var id: String
+  var documentId: String
+  var createdAt: Date
+  var title: String
+  var content: ShareInboxContent
+  var target: ShareInboxTarget?
+  var previewText: String?
+  var attachments: [ShareInboxAttachment]
+  var result: ShareInboxResult?
+  var lastError: String?
+
+  init(
+    id: String = UUID().uuidString,
+    documentId: String = UUID().uuidString,
+    createdAt: Date = Date(),
+    title: String,
+    content: ShareInboxContent,
+    target: ShareInboxTarget? = nil,
+    previewText: String? = nil,
+    attachments: [ShareInboxAttachment] = [],
+    result: ShareInboxResult? = nil,
+    lastError: String? = nil
+  ) {
+    self.id = id
+    self.documentId = documentId
+    self.createdAt = createdAt
+    self.title = title
+    self.content = content
+    self.target = target
+    self.previewText = previewText
+    self.attachments = attachments
+    self.result = result
+    self.lastError = lastError
+  }
+}
+
+struct SharePayloadFile: Equatable {
+  var data: Data
+  var mimeType: String
+  var fileName: String
+}
+
+struct SharePayloadDraft: Equatable {
+  var title: String
+  var content: ShareInboxContent?
+  var previewText: String
+  var file: SharePayloadFile?
+  var errorMessage: String?
+}