feat(ios): polish onboarding and native sign-in flow (#15217)

## Summary
- Reworks the iOS onboarding, native sign-in, and paywall flow so
first-install and cold-start entry stay native, adaptive, and aligned
with the current login/subscription gates.
- Removes onboarding swipe paging, refines onboarding/paywall layout
behavior, and keeps AI/paywall entry behavior consistent for logged-in
and subscribed users.
- Adds the new mobile all-docs empty states with localized copy and
dialog entry points, and closes the remaining review follow-ups by
removing the onboarding plan artifact and dropping the iOS AI
subscription bypass.

## Test plan
- Built the iOS app for simulator with `xcodebuild -workspace
App.xcworkspace -scheme App -configuration Debug -sdk iphonesimulator
-destination 'generic/platform=iOS Simulator' ARCHS=arm64
ONLY_ACTIVE_ARCH=YES CODE_SIGNING_ALLOWED=NO CODE_SIGNING_REQUIRED=NO
build` during the native onboarding/sign-in flow work.
- Let the repo pre-commit hooks run on the latest follow-up commit
(`prettier` + `eslint --fix`).
- Checked diagnostics for the edited TS/TSX files after the review
follow-up changes.
- Manually iterated on onboarding/native sign-in/paywall UI states in
simulator during implementation.

---------

Co-authored-by: DarkSky <darksky2048@gmail.com>

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

@@ -177,6 +177,7 @@ private extension ChatManager {
       timeoutInterval: 10
     )
     request.setValue("close", forHTTPHeaderField: "Connection")
+    request = QLService.shared.authorized(request)
 
     let closable = ClosableTask(detachedTask: .detached(operation: {
       let eventSource = EventSource()

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

@@ -70,7 +70,10 @@ public class IntelligentContext {
 
   private init() {}
 
-  public func preparePresent(_ completion: @escaping (Result<Void, Error>) -> Void) {
+  public func preparePresent(
+    createSession shouldCreateSession: Bool = true,
+    _ completion: @escaping (Result<Void, Error>) -> Void
+  ) {
     assert(webView != nil)
     DispatchQueue.global(qos: .userInitiated).async { [self] in
       prepareTemporaryDirectory()
@@ -130,6 +133,10 @@ public class IntelligentContext {
       let currentDocumentId: String? = webViewMetadata[.currentDocId] as? String
 
       dumpMetadataContents()
+      guard shouldCreateSession else {
+        completion(.success(()))
+        return
+      }
 
       createSession(
         workspaceId: workspaceId,

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

@@ -6,6 +6,7 @@
 //
 
 import Apollo
+import AffineGraphQL
 import Foundation
 
 extension QLService {
@@ -17,5 +18,36 @@ extension QLService {
         self.session.configuration.httpCookieStorage?.setCookie(cookie)
       }
     }
+
+    @discardableResult
+    override func sendRequest(
+      _ request: URLRequest,
+      taskDescription: String?,
+      rawTaskCompletionHandler: RawCompletion?,
+      completion: @escaping Completion
+    ) -> URLSessionTask {
+      super.sendRequest(
+        QLService.shared.authorized(request),
+        taskDescription: taskDescription,
+        rawTaskCompletionHandler: rawTaskCompletionHandler,
+        completion: completion
+      )
+    }
+  }
+}
+
+extension QLService {
+  func authorized(_ request: URLRequest) -> URLRequest {
+    guard request.value(forHTTPHeaderField: "Authorization") == nil,
+          let requestURL = request.url,
+          let token = AuthAccessTokenCache.shared.token(
+            for: requestURL, matching: serverBaseURL)
+    else {
+      return request
+    }
+
+    var authorized = request
+    authorized.setValue("Bearer \(token)", forHTTPHeaderField: "Authorization")
+    return authorized
   }
 }