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/Services/CommandProcessor.swift

@@ -165,8 +165,12 @@ class CommandProcessor {
             let geoBlocked = Array(SecureIdentityStateManager.shared.getBlockedNostrPubkeys())
             var geoNames: [String] = []
             if let vm = chatViewModel {
+                #if os(iOS)
                 let visible = vm.visibleGeohashPeople()
                 let visibleIndex = Dictionary(uniqueKeysWithValues: visible.map { ($0.id.lowercased(), $0.displayName) })
+                #else
+                let visibleIndex: [String: String] = [:]
+                #endif
                 for pk in geoBlocked {
                     if let name = visibleIndex[pk.lowercased()] {
                         geoNames.append(name)