QR verification: live challenge/response over Noise; persistence, offline badges, and UX/perf polish (#510)

* QR verification scaffold: add Noise verify payload types, VerificationService with QR schema/signing, placeholder MyQR/Scan views, and UI entry points in header

* QR: fix VerificationQR mutability (sigHex var) and remove duplicate Data hex helpers to resolve redeclaration; wire signed payload assembly

* QR: render actual QR images with CoreImage; add copy button; keep scanner placeholder for now

* QR: fix SwiftUI modifiers — apply .interpolation(.none) and .resizable() to platform Image inside ImageWrapper; remove from wrapper usage

* QR: add iOS camera scanner using AVFoundation; integrate into Scan view; add NSCameraUsageDescription to Info.plist

* QR: make NoisePayloadType exhaustive in ChatViewModel switches by ignoring verifyChallenge/verifyResponse for now (placeholder)

* QR verification: speed + persistence + UX

- Inject live Noise into VerificationService; prewarm QR on app start
- Keep camera active; remove intermediate responder toast
- One-shot/dupe guards and deferred send on handshake
- Persist verified status immediately; standardize fingerprint (SHA-256)
- Show verified badge for offline favorites; mutual verification toast
- VERIFY sheet styling to match peer sheet; UI polish
- Logs to diagnose verified load + favorites mapping

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Co-authored-by: jack <jackjackbits@users.noreply.github.com>

bitchat/Protocols/BitchatProtocol.swift

@@ -155,12 +155,17 @@ enum NoisePayloadType: UInt8 {
     case privateMessage = 0x01      // Private chat message
     case readReceipt = 0x02         // Message was read
     case delivered = 0x03           // Message was delivered
+    // Verification (QR-based OOB binding)
+    case verifyChallenge = 0x10     // Verification challenge
+    case verifyResponse  = 0x11     // Verification response
     
     var description: String {
         switch self {
         case .privateMessage: return "privateMessage"
         case .readReceipt: return "readReceipt"
         case .delivered: return "delivered"
+        case .verifyChallenge: return "verifyChallenge"
+        case .verifyResponse: return "verifyResponse"
         }
     }
 }