feat(editor): migrate typst mermaid to native (#14499)

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

* **New Features**
* Native/WASM Mermaid and Typst SVG preview rendering on desktop and
mobile, plus cross-platform Preview plugin integrations.

* **Improvements**
* Centralized, sanitized rendering bridge with automatic Typst
font-directory handling and configurable native renderer selection.
* More consistent and robust error serialization and worker-backed
preview flows for improved stability and performance.

* **Tests**
* Extensive unit and integration tests for preview rendering, font
discovery, sanitization, and error serialization.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

packages/frontend/apps/ios/App/Packages/AffineGraphQL/Sources/Schema/CustomScalars/JSON.swift

@@ -8,4 +8,18 @@
 import ApolloAPI
 
 /// The `JSON` scalar type represents JSON values as specified by [ECMA-404](http://www.ecma-international.org/publications/files/ECMA-ST/ECMA-404.pdf).
-public typealias JSON = String
+public struct JSON: CustomScalarType, Hashable, ExpressibleByDictionaryLiteral {
+  public let value: JSONValue
+
+  public init(_jsonValue value: JSONValue) throws {
+    self.value = value
+  }
+
+  public init(dictionaryLiteral elements: (String, JSONValue)...) {
+    value = ApolloAPI.JSONObject(uniqueKeysWithValues: elements) as JSONValue
+  }
+
+  public var _jsonValue: JSONValue {
+    value
+  }
+}

packages/frontend/apps/ios/App/Packages/AffineGraphQL/Sources/Schema/CustomScalars/JSONObject.swift

@@ -8,4 +8,22 @@
 import ApolloAPI
 
 /// The `JSONObject` scalar type represents JSON objects as specified by [ECMA-404](http://www.ecma-international.org/publications/files/ECMA-ST/ECMA-404.pdf).
-public typealias JSONObject = String
+public struct JSONObject: CustomScalarType, Hashable, ExpressibleByDictionaryLiteral {
+  public let object: ApolloAPI.JSONObject
+
+  public init(_jsonValue value: JSONValue) throws {
+    object = try ApolloAPI.JSONObject(_jsonValue: value)
+  }
+
+  public init(_ object: ApolloAPI.JSONObject) {
+    self.object = object
+  }
+
+  public init(dictionaryLiteral elements: (String, JSONValue)...) {
+    object = ApolloAPI.JSONObject(uniqueKeysWithValues: elements)
+  }
+
+  public var _jsonValue: JSONValue {
+    object
+  }
+}

packages/frontend/apps/ios/App/Packages/Intelligents/Sources/Intelligents/ChatManager/ChatManager+Stream.swift

@@ -26,6 +26,7 @@ private extension InputBoxData {
 }
 
 public extension ChatManager {
+  @MainActor
   func startUserRequest(editorData: InputBoxData, sessionId: String) {
     append(sessionId: sessionId, UserMessageCellViewModel(
       id: .init(),
@@ -163,7 +164,7 @@ private extension ChatManager {
     assert(!Thread.isMainThread)
     print("[+] starting copilot response for session: \(sessionId)")
 
-    let messageParameters: [String: AnyHashable] = [
+    let messageParameters: AffineGraphQL.JSON = [
       // packages/frontend/core/src/blocksuite/ai/provider/setup-provider.tsx
       "docs": editorData.documentAttachments.map(\.documentID), // affine doc
       "files": [String](), // attachment in context, keep nil for now
@@ -193,18 +194,14 @@ private extension ChatManager {
       },
     ].flatMap(\.self)
     assert(uploadableAttachments.allSatisfy { !($0.data?.isEmpty ?? true) })
-    guard let input = try? CreateChatMessageInput(
+    let input = CreateChatMessageInput(
       attachments: [],
       blob: attachmentCount == 1 ? "" : .none,
       blobs: attachmentCount > 1 && attachmentCount != 0 ? .some([]) : .none,
       content: .some(contextSnippet.isEmpty ? editorData.text : "\(contextSnippet)\n\(editorData.text)"),
-      params: .some(AffineGraphQL.JSON(_jsonValue: messageParameters)),
+      params: .some(messageParameters),
       sessionId: sessionId
-    ) else {
-      report(sessionId, ChatError.unknownError)
-      assertionFailure() // very unlikely to happen
-      return
-    }
+    )
     let mutation = CreateCopilotMessageMutation(options: input)
     QLService.shared.client.upload(operation: mutation, files: uploadableAttachments) { result in
       print("[*] createCopilotMessage result: \(result)")
@@ -277,7 +274,7 @@ private extension ChatManager {
       let eventSource = EventSource()
       let dataTask = eventSource.dataTask(for: request)
       var document = ""
-      self.writeMarkdownContent(document + loadingIndicator, sessionId: sessionId, vmId: vmId)
+      await self.writeMarkdownContent(document + loadingIndicator, sessionId: sessionId, vmId: vmId)
       for await event in dataTask.events() {
         switch event {
         case .open:
@@ -287,7 +284,7 @@ private extension ChatManager {
         case let .event(event):
           guard let data = event.data else { continue }
           document += data
-          self.writeMarkdownContent(
+          await self.writeMarkdownContent(
             document + loadingIndicator,
             sessionId: sessionId,
             vmId: vmId
@@ -297,13 +294,13 @@ private extension ChatManager {
           print("[*] connection closed")
         }
       }
-      self.writeMarkdownContent(document, sessionId: sessionId, vmId: vmId)
+      await self.writeMarkdownContent(document, sessionId: sessionId, vmId: vmId)
       self.closeAll()
     }))
     self.closable.append(closable)
   }
 
-  private func writeMarkdownContent(
+  @MainActor private func writeMarkdownContent(
     _ document: String,
     sessionId: SessionID,
     vmId: UUID

packages/frontend/apps/ios/App/Packages/Intelligents/Sources/Intelligents/IntelligentContext/IntelligentContext+Markdown.swift

@@ -9,7 +9,7 @@ import Foundation
 import MarkdownView
 
 extension IntelligentContext {
-  func prepareMarkdownViewThemes() {
+  @MainActor func prepareMarkdownViewThemes() {
     MarkdownTheme.default.colors.body = .affineTextPrimary
     MarkdownTheme.default.colors.highlight = .affineTextLink
   }

packages/frontend/apps/ios/App/Packages/Intelligents/Sources/Intelligents/Interface/View/ChatCell/ViewModel/CCVM+Assistant.swift

@@ -40,7 +40,7 @@ struct AssistantMessageCellViewModel: ChatCellViewModel {
 
   var preprocessedContent: MarkdownTextView.PreprocessedContent
 
-  init(
+  @MainActor init(
     id: UUID,
     content: String,
     timestamp: Date,