feat(share-ext): fix double "Send to", Teams-style layout, clearer branding

Two things from testing (the in-sheet picker with avatars + multi-select works):

1. Double "Send to": after the extension sent, opening the app ALSO popped the web
   "Send to" modal for the same file. Cause: the extension wrote a safety-net
   manifest up front, which the app then picked up. Now the manifest represents an
   UNSENT share only — written solely when the extension can't send (no token) or a
   send fails. A successful in-sheet send clears the staged files and leaves nothing,
   so the app never re-offers it. Cancel also clears staged files (no orphans).

2. Layout aligned to the Teams reference:
   - Preview strip of thumbnails for what's being shared (image → the image, video →
     first frame via AVAssetImageGenerator, else a doc icon).
   - Radio selectors on the right — an always-visible empty circle that fills to a
     navy check when selected (clearer multi-select than an appear-on-select tick).
   - "Recent chats" section header; subtitle under each name (Direct message /
     Group · N members).
   - Clearer branding: bold white "Share to Biz Connect" on the navy bar.

Native-only — NEEDS A NEW iOS BUILD. Balance + selectors checked.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

mobile/ios-share/ShareViewController.swift

@@ -1,4 +1,5 @@
 import UIKit
+import AVFoundation
 import UniformTypeIdentifiers
 
 // Share Extension — puts "Biz Connect" in the iOS share sheet AND does the whole send right here, the way
@@ -7,23 +8,30 @@ import UniformTypeIdentifiers
 // How it can send without the app: the app writes a bearer token + API base into the App Group each launch
 // (via /api/share/token → ShareInbox.setAuth). This extension reads that token and calls the same server
 // API the native client uses — GET /api/messages/conversations, POST /api/messages/upload, POST
-// /api/messages. If there's no token (user never opened/signed in), we say so and still stage the files so
-// opening the app later picks them up.
+// /api/messages.
+//
+// Manifest lifecycle (why the app doesn't also pop a "Send to" sheet): the App Group manifest represents an
+// UNSENT share. We only write it when this extension can't send (no token) or a send fails — so a
+// successful in-sheet send leaves nothing behind and the app never re-offers it. Cancel/success clear any
+// staged files too, so the App Group doesn't accumulate orphans.
 
 struct ShareChat {
     let kind: String   // "dm" | "group"
     let id: String
     let name: String
     let avatar: String?
+    let subtitle: String
     var key: String { kind + ":" + id }
 }
 
 struct ShareItem {
     let name: String
-    let url: URL        // staged copy in the App Group container
+    let url: URL
     let mime: String
     let isText: Bool
     let text: String
+    var isImage: Bool { mime.hasPrefix("image/") }
+    var isVideo: Bool { mime.hasPrefix("video/") }
 }
 
 class ShareViewController: UIViewController, UITableViewDataSource, UITableViewDelegate {
@@ -37,15 +45,16 @@ class ShareViewController: UIViewController, UITableViewDataSource, UITableViewD
     private var items: [ShareItem] = []
     private var chats: [ShareChat] = []
     private var filtered: [ShareChat] = []
-    private var selected = Set<String>()          // chat keys chosen for multi-send
+    private var selected = Set<String>()
     private var avatarCache: [String: UIImage] = [:]
     private var sending = false
 
-    private let table = UITableView(frame: .zero, style: .plain)
+    private let table = UITableView(frame: .zero, style: .grouped)
     private let search = UISearchBar()
     private let statusLabel = UILabel()
     private let spinner = UIActivityIndicatorView(style: .medium)
-    private let subtitle = UILabel()
+    private let previewStack = UIStackView()
+    private let previewScroll = UIScrollView()
     private var sendButton: UIBarButtonItem!
 
     // MARK: - Lifecycle
@@ -68,21 +77,18 @@ class ShareViewController: UIViewController, UITableViewDataSource, UITableViewD
     // MARK: - UI
 
     private func buildUI() {
-        view.backgroundColor = .systemBackground
+        view.backgroundColor = .systemGroupedBackground
 
-        // Branded navigation bar (Biz Connect navy, white title + buttons).
         let nav = UINavigationBar()
         nav.translatesAutoresizingMaskIntoConstraints = false
         let appearance = UINavigationBarAppearance()
         appearance.configureWithOpaqueBackground()
         appearance.backgroundColor = brandNavy
-        appearance.titleTextAttributes = [.foregroundColor: UIColor.white]
-        appearance.largeTitleTextAttributes = [.foregroundColor: UIColor.white]
+        appearance.titleTextAttributes = [.foregroundColor: UIColor.white, .font: UIFont.systemFont(ofSize: 17, weight: .bold)]
         nav.standardAppearance = appearance
         nav.scrollEdgeAppearance = appearance
         nav.tintColor = .white
-        let navItem = UINavigationItem(title: "Send to…")
-        navItem.prompt = "Biz Connect"           // small brand line above the title
+        let navItem = UINavigationItem(title: "Share to Biz Connect")
         navItem.leftBarButtonItem = UIBarButtonItem(barButtonSystemItem: .cancel, target: self, action: #selector(cancelTapped))
         sendButton = UIBarButtonItem(title: "Send", style: .done, target: self, action: #selector(sendTapped))
         sendButton.isEnabled = false
@@ -90,13 +96,17 @@ class ShareViewController: UIViewController, UITableViewDataSource, UITableViewD
         nav.setItems([navItem], animated: false)
         view.addSubview(nav)
 
-        subtitle.font = .systemFont(ofSize: 12)
-        subtitle.textColor = .secondaryLabel
-        subtitle.textAlignment = .center
-        subtitle.translatesAutoresizingMaskIntoConstraints = false
-        view.addSubview(subtitle)
+        // Preview strip — thumbnails of what's being shared (like Teams' attachment row).
+        previewScroll.translatesAutoresizingMaskIntoConstraints = false
+        previewScroll.showsHorizontalScrollIndicator = false
+        previewStack.axis = .horizontal
+        previewStack.spacing = 8
+        previewStack.alignment = .center
+        previewStack.translatesAutoresizingMaskIntoConstraints = false
+        previewScroll.addSubview(previewStack)
+        view.addSubview(previewScroll)
 
-        search.placeholder = "Search chats…"
+        search.placeholder = "Search for people or groups"
         search.delegate = self
         search.searchBarStyle = .minimal
         search.translatesAutoresizingMaskIntoConstraints = false
@@ -104,8 +114,8 @@ class ShareViewController: UIViewController, UITableViewDataSource, UITableViewD
 
         table.dataSource = self
         table.delegate = self
-        table.rowHeight = 56
-        table.register(UITableViewCell.self, forCellReuseIdentifier: "chat")
+        table.rowHeight = 60
+        table.backgroundColor = .systemGroupedBackground
         table.translatesAutoresizingMaskIntoConstraints = false
         view.addSubview(table)
 
@@ -124,16 +134,26 @@ class ShareViewController: UIViewController, UITableViewDataSource, UITableViewD
             nav.topAnchor.constraint(equalTo: view.safeAreaLayoutGuide.topAnchor),
             nav.leadingAnchor.constraint(equalTo: view.leadingAnchor),
             nav.trailingAnchor.constraint(equalTo: view.trailingAnchor),
-            subtitle.topAnchor.constraint(equalTo: nav.bottomAnchor, constant: 4),
-            subtitle.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant: 16),
-            subtitle.trailingAnchor.constraint(equalTo: view.trailingAnchor, constant: -16),
-            search.topAnchor.constraint(equalTo: subtitle.bottomAnchor, constant: 4),
+
+            previewScroll.topAnchor.constraint(equalTo: nav.bottomAnchor, constant: 10),
+            previewScroll.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant: 16),
+            previewScroll.trailingAnchor.constraint(equalTo: view.trailingAnchor, constant: -16),
+            previewScroll.heightAnchor.constraint(equalToConstant: 56),
+            previewStack.topAnchor.constraint(equalTo: previewScroll.topAnchor),
+            previewStack.bottomAnchor.constraint(equalTo: previewScroll.bottomAnchor),
+            previewStack.leadingAnchor.constraint(equalTo: previewScroll.leadingAnchor),
+            previewStack.trailingAnchor.constraint(equalTo: previewScroll.trailingAnchor),
+            previewStack.heightAnchor.constraint(equalTo: previewScroll.heightAnchor),
+
+            search.topAnchor.constraint(equalTo: previewScroll.bottomAnchor, constant: 8),
             search.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant: 6),
             search.trailingAnchor.constraint(equalTo: view.trailingAnchor, constant: -6),
+
             table.topAnchor.constraint(equalTo: search.bottomAnchor, constant: 2),
             table.leadingAnchor.constraint(equalTo: view.leadingAnchor),
             table.trailingAnchor.constraint(equalTo: view.trailingAnchor),
             table.bottomAnchor.constraint(equalTo: view.bottomAnchor),
+
             statusLabel.centerXAnchor.constraint(equalTo: view.centerXAnchor),
             statusLabel.centerYAnchor.constraint(equalTo: view.centerYAnchor),
             statusLabel.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant: 32),
@@ -157,7 +177,51 @@ class ShareViewController: UIViewController, UITableViewDataSource, UITableViewD
         sendButton.isEnabled = n > 0 && !sending
     }
 
-    // MARK: - Ingest shared items
+    // MARK: - Preview thumbnails
+
+    private func buildPreviews() {
+        for f in items where !f.isText {
+            let iv = UIImageView()
+            iv.translatesAutoresizingMaskIntoConstraints = false
+            iv.contentMode = .scaleAspectFill
+            iv.clipsToBounds = true
+            iv.layer.cornerRadius = 8
+            iv.backgroundColor = .tertiarySystemFill
+            iv.tintColor = .secondaryLabel
+            iv.widthAnchor.constraint(equalToConstant: 56).isActive = true
+            iv.heightAnchor.constraint(equalToConstant: 56).isActive = true
+            iv.image = UIImage(systemName: f.isVideo ? "video.fill" : "doc.fill")
+            previewStack.addArrangedSubview(iv)
+            thumbnail(for: f) { img in if let img = img { DispatchQueue.main.async { iv.image = img; iv.contentMode = .scaleAspectFill } } }
+        }
+        if items.contains(where: { $0.isText }) {
+            let lbl = UILabel()
+            lbl.text = "🔗 link"
+            lbl.font = .systemFont(ofSize: 13)
+            lbl.textColor = .secondaryLabel
+            previewStack.addArrangedSubview(lbl)
+        }
+    }
+
+    private func thumbnail(for item: ShareItem, completion: @escaping (UIImage?) -> Void) {
+        DispatchQueue.global(qos: .userInitiated).async {
+            if item.isImage, let img = UIImage(contentsOfFile: item.url.path) {
+                return completion(img)
+            }
+            if item.isVideo {
+                let asset = AVURLAsset(url: item.url)
+                let gen = AVAssetImageGenerator(asset: asset)
+                gen.appliesPreferredTrackTransform = true
+                gen.maximumSize = CGSize(width: 168, height: 168)
+                if let cg = try? gen.copyCGImage(at: CMTime(seconds: 0.1, preferredTimescale: 600), actualTime: nil) {
+                    return completion(UIImage(cgImage: cg))
+                }
+            }
+            completion(nil)
+        }
+    }
+
+    // MARK: - Ingest
 
     private func ingest() {
         setStatus("Preparing…", busy: true)
@@ -179,10 +243,8 @@ class ShareViewController: UIViewController, UITableViewDataSource, UITableViewD
         group.notify(queue: .main) { [weak self] in
             guard let self = self else { return }
             self.items = collected
-            self.writeManifest(collected)   // safety net: app can still collect if send here fails
             if collected.isEmpty { return self.finishFail("Couldn’t read the shared file.") }
-            let fileCount = collected.filter { !$0.isText }.count
-            self.subtitle.text = fileCount > 0 ? "Sharing \(fileCount) file\(fileCount == 1 ? "" : "s")" : "Sharing a link"
+            self.buildPreviews()
             self.loadChats()
         }
     }
@@ -225,6 +287,7 @@ class ShareViewController: UIViewController, UITableViewDataSource, UITableViewD
 
     private func loadChats() {
         guard !token.isEmpty else {
+            writeManifest(items)   // no token → let the app pick these up
             setStatus("Open Biz Connect and sign in first, then share again.\n\nYour file is saved and will be waiting in the app.")
             return
         }
@@ -233,12 +296,14 @@ class ShareViewController: UIViewController, UITableViewDataSource, UITableViewD
             guard let self = self else { return }
             guard let data = data,
                   let arr = (try? JSONSerialization.jsonObject(with: data)) as? [[String: Any]] else {
+                self.writeManifest(self.items)
                 self.setStatus("Couldn’t load your chats.\n\nOpen Biz Connect once, then try sharing again.")
                 return
             }
             let parsed: [ShareChat] = arr.compactMap { row in
                 guard let kind = row["kind"] as? String, let id = idString(row["id"]), let name = row["name"] as? String else { return nil }
-                return ShareChat(kind: kind, id: id, name: name, avatar: row["avatar"] as? String)
+                let sub = kind == "group" ? "Group" + ((row["members"] as? Int).map { " · \($0) members" } ?? "") : "Direct message"
+                return ShareChat(kind: kind, id: id, name: name, avatar: row["avatar"] as? String, subtitle: sub)
             }
             DispatchQueue.main.async {
                 self.chats = parsed
@@ -253,15 +318,26 @@ class ShareViewController: UIViewController, UITableViewDataSource, UITableViewD
 
     func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int { filtered.count }
 
+    func tableView(_ tableView: UITableView, titleForHeaderInSection section: Int) -> String? {
+        filtered.isEmpty ? nil : "Recent chats"
+    }
+
     func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
-        let cell = tableView.dequeueReusableCell(withIdentifier: "chat", for: indexPath)
+        let cell = tableView.dequeueReusableCell(withIdentifier: "chat") ?? UITableViewCell(style: .subtitle, reuseIdentifier: "chat")
         let c = filtered[indexPath.row]
         cell.textLabel?.text = c.name
         cell.textLabel?.font = .systemFont(ofSize: 16)
-        cell.accessoryType = selected.contains(c.key) ? .checkmark : .none
-        cell.tintColor = brandNavy
-        // Round avatar: cached image, else initials placeholder + async load.
-        cell.imageView?.layer.cornerRadius = 18
+        cell.detailTextLabel?.text = c.subtitle
+        cell.detailTextLabel?.textColor = .secondaryLabel
+        // Radio selector on the right (empty circle → filled navy check), always visible like Teams.
+        let selImg = selected.contains(c.key)
+            ? UIImage(systemName: "checkmark.circle.fill")?.withTintColor(brandNavy, renderingMode: .alwaysOriginal)
+            : UIImage(systemName: "circle")?.withTintColor(.systemGray3, renderingMode: .alwaysOriginal)
+        let selView = UIImageView(image: selImg)
+        selView.frame = CGRect(x: 0, y: 0, width: 26, height: 26)
+        cell.accessoryView = selView
+        // Round avatar
+        cell.imageView?.layer.cornerRadius = 20
         cell.imageView?.layer.masksToBounds = true
         if let img = avatarCache[c.key] {
             cell.imageView?.image = img
@@ -285,7 +361,6 @@ class ShareViewController: UIViewController, UITableViewDataSource, UITableViewD
 
     private func loadAvatar(for chat: ShareChat) {
         guard let av = chat.avatar, !av.isEmpty else { return }
-        // Data URL → decode inline.
         if av.hasPrefix("data:") {
             if let comma = av.firstIndex(of: ","),
                let d = Data(base64Encoded: String(av[av.index(after: comma)...])),
@@ -297,7 +372,7 @@ class ShareViewController: UIViewController, UITableViewDataSource, UITableViewD
         let urlStr = av.hasPrefix("/") ? (apiBase + av) : av
         guard let url = URL(string: urlStr) else { return }
         var req = URLRequest(url: url)
-        if !token.isEmpty { req.setValue("Bearer " + token, forHTTPHeaderField: "Authorization") } // /files needs auth
+        if !token.isEmpty { req.setValue("Bearer " + token, forHTTPHeaderField: "Authorization") }
         URLSession.shared.dataTask(with: req) { [weak self] d, _, _ in
             guard let self = self, let d = d, let img = Self.circularImage(from: d) else { return }
             self.cache(img, for: chat)
@@ -313,7 +388,7 @@ class ShareViewController: UIViewController, UITableViewDataSource, UITableViewD
         }
     }
 
-    private func initialsImage(_ name: String, size: CGFloat = 36) -> UIImage {
+    private func initialsImage(_ name: String, size: CGFloat = 40) -> UIImage {
         let parts = name.split(separator: " ")
         let initials = parts.prefix(2).compactMap { $0.first }.map { String($0) }.joined().uppercased()
         let bg = Self.color(for: name)
@@ -333,12 +408,11 @@ class ShareViewController: UIViewController, UITableViewDataSource, UITableViewD
         }
     }
 
-    private static func circularImage(from data: Data, size: CGFloat = 36) -> UIImage? {
+    private static func circularImage(from data: Data, size: CGFloat = 40) -> UIImage? {
         guard let img = UIImage(data: data) else { return nil }
         let renderer = UIGraphicsImageRenderer(size: CGSize(width: size, height: size))
         return renderer.image { _ in
             UIBezierPath(ovalIn: CGRect(x: 0, y: 0, width: size, height: size)).addClip()
-            // Aspect-fill into the circle.
             let scale = max(size / img.size.width, size / img.size.height)
             let w = img.size.width * scale, h = img.size.height * scale
             img.draw(in: CGRect(x: (size - w) / 2, y: (size - h) / 2, width: w, height: h))
@@ -359,7 +433,7 @@ class ShareViewController: UIViewController, UITableViewDataSource, UITableViewD
         return palette[Int(h % UInt32(palette.count))]
     }
 
-    // MARK: - Send (to every selected chat)
+    // MARK: - Send
 
     @objc private func sendTapped() {
         guard !sending else { return }
@@ -369,6 +443,7 @@ class ShareViewController: UIViewController, UITableViewDataSource, UITableViewD
         updateSendButton()
         search.isHidden = true
         table.isHidden = true
+        previewScroll.isHidden = true
         let label = targets.count == 1 ? targets[0].name : "\(targets.count) chats"
         setStatus("Sending to \(label)…", busy: true)
 
@@ -376,9 +451,6 @@ class ShareViewController: UIViewController, UITableViewDataSource, UITableViewD
             let files = self.items.filter { !$0.isText }
             let texts = self.items.filter { $0.isText }.map { $0.text }
             var ok = true
-
-            // Upload each file ONCE; reuse its attachment id for every selected chat (server allows the
-            // uploader to attach the same id repeatedly).
             var attIds: [String] = []
             for (i, f) in files.enumerated() {
                 if files.count > 1 { self.setStatus("Uploading \(i + 1) of \(files.count)…", busy: true) }
@@ -395,16 +467,17 @@ class ShareViewController: UIViewController, UITableViewDataSource, UITableViewD
                     }
                 }
             }
-
             DispatchQueue.main.async {
                 if ok {
-                    self.clearManifest()
+                    self.clearStaged()   // sent → leave nothing for the app to re-offer
                     self.setStatus("✓ Sent to \(label)")
                     DispatchQueue.main.asyncAfter(deadline: .now() + 0.8) { self.finish() }
                 } else {
+                    self.writeManifest(self.items)   // failed → let the app pick these up
                     self.sending = false
                     self.search.isHidden = false
                     self.table.isHidden = false
+                    self.previewScroll.isHidden = false
                     self.updateSendButton()
                     self.setStatus("Couldn’t send. Your file is saved — open Biz Connect to send it.")
                     DispatchQueue.main.asyncAfter(deadline: .now() + 2.4) { self.finish() }
@@ -494,6 +567,7 @@ class ShareViewController: UIViewController, UITableViewDataSource, UITableViewD
         return candidate
     }
 
+    // Written only when this extension can't send — it marks an UNSENT share for the app to pick up.
     private func writeManifest(_ its: [ShareItem]) {
         guard let dir = sharedDir() else { return }
         let records: [[String: Any]] = its.map { it in
@@ -505,7 +579,9 @@ class ShareViewController: UIViewController, UITableViewDataSource, UITableViewD
         }
     }
 
-    private func clearManifest() {
+    // Remove the staged files + any manifest, so the App Group doesn't accumulate and the app has nothing
+    // to re-offer after a successful send or a cancel.
+    private func clearStaged() {
         guard let dir = sharedDir() else { return }
         let fm = FileManager.default
         if let entries = try? fm.contentsOfDirectory(at: dir, includingPropertiesForKeys: nil) {
@@ -521,6 +597,7 @@ class ShareViewController: UIViewController, UITableViewDataSource, UITableViewD
     // MARK: - Finish
 
     @objc private func cancelTapped() {
+        clearStaged()   // nothing sent → don't leave orphans or let the app re-offer
         extensionContext?.cancelRequest(withError: NSError(domain: "share", code: 0))
     }
 
@@ -534,7 +611,6 @@ class ShareViewController: UIViewController, UITableViewDataSource, UITableViewD
     }
 }
 
-// A JSON id may decode as String or NSNumber depending on the value — normalise to String.
 private func idString(_ v: Any?) -> String? {
     if let s = v as? String { return s }
     if let n = v as? NSNumber { return n.stringValue }