Require review before importing shared content (#1430)

Replaces the share-extension handoff that auto-sent shared text/URLs into the current channel with a validated, single-slot 24h envelope that shows the destination and a bounded preview and requires an explicit tap to copy into the composer — it never sends. Rejects malformed/oversized/control-character/non-HTTP(S)/expired payloads (including bidi-override U+202E), and clears on consume/cancel/expiry/panic.

Rebased onto main with Persian strings added for all new keys (30-locale coverage verified), plus a panic-recovery clear so an envelope staged during an interrupted wipe cannot survive relaunch.

bitchat/App/AppArchitecture.swift

@@ -2,11 +2,6 @@ import BitFoundation
 import Combine
 import Foundation
 
-enum SharedContentKind: String, Sendable, Equatable {
-    case text
-    case url
-}
-
 enum RuntimeScenePhase: String, Sendable, Equatable {
     case active
     case inactive
@@ -25,7 +20,7 @@ enum AppEvent: Sendable, Equatable {
     case startupCompleted
     case scenePhaseChanged(RuntimeScenePhase)
     case openedURL(String)
-    case sharedContentAccepted(SharedContentKind)
+    case sharedContentReadyForReview(SharedContentKind)
     case notificationOpened(peerID: PeerID?)
     case deepLinkOpened(String)
     case torLifecycleChanged(TorLifecycleEvent)