WIP: local handoff implementation

Local work on the social.io handoff before merging the claude
worktree branch. Includes the full per-spec Sources/Core/Design
module (8 files), watchOS target under WatchApp/, Live Activity +
widget extension, entitlements, scheme, and asset catalog.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

swift/Sources/Core/Models/MailModels.swift

@@ -3,9 +3,12 @@ import Foundation
 enum Mailbox: String, CaseIterable, Identifiable, Codable {
     case inbox
     case starred
+    case snoozed
+    case screener
     case sent
     case drafts
     case archive
+    case trash
 
     var id: String { rawValue }
 
@@ -13,9 +16,12 @@ enum Mailbox: String, CaseIterable, Identifiable, Codable {
         switch self {
         case .inbox: "Inbox"
         case .starred: "Starred"
+        case .snoozed: "Snoozed"
+        case .screener: "The Screener"
         case .sent: "Sent"
         case .drafts: "Drafts"
         case .archive: "Archive"
+        case .trash: "Trash"
         }
     }
 
@@ -23,9 +29,12 @@ enum Mailbox: String, CaseIterable, Identifiable, Codable {
         switch self {
         case .inbox: "tray.full"
         case .starred: "star"
+        case .snoozed: "clock.badge"
+        case .screener: "line.3.horizontal.decrease.circle"
         case .sent: "paperplane"
         case .drafts: "doc.text"
         case .archive: "archivebox"
+        case .trash: "trash"
         }
     }
 }
@@ -50,6 +59,7 @@ struct MailMessage: Identifiable, Hashable, Codable {
     let sentAt: Date
     let body: String
     let isDraft: Bool
+    let attachments: [MailAttachment]
 
     init(
         id: UUID = UUID(),
@@ -58,7 +68,8 @@ struct MailMessage: Identifiable, Hashable, Codable {
         recipients: [MailPerson],
         sentAt: Date,
         body: String,
-        isDraft: Bool = false
+        isDraft: Bool = false,
+        attachments: [MailAttachment] = []
     ) {
         self.id = id
         self.routeID = routeID
@@ -67,6 +78,19 @@ struct MailMessage: Identifiable, Hashable, Codable {
         self.sentAt = sentAt
         self.body = body
         self.isDraft = isDraft
+        self.attachments = attachments
+    }
+}
+
+struct MailAttachment: Identifiable, Hashable, Codable {
+    let id: UUID
+    let name: String
+    let size: String
+
+    init(id: UUID = UUID(), name: String, size: String) {
+        self.id = id
+        self.name = name
+        self.size = size
     }
 }
 
@@ -80,6 +104,9 @@ struct MailThread: Identifiable, Hashable, Codable {
     var isUnread: Bool
     var isStarred: Bool
     var tags: [String]
+    var lane: Lane
+    var summary: [String]?
+    var isScreeningCandidate: Bool
 
     init(
         id: UUID = UUID(),
@@ -90,7 +117,10 @@ struct MailThread: Identifiable, Hashable, Codable {
         messages: [MailMessage],
         isUnread: Bool,
         isStarred: Bool,
-        tags: [String] = []
+        tags: [String] = [],
+        lane: Lane = .people,
+        summary: [String]? = nil,
+        isScreeningCandidate: Bool = false
     ) {
         self.id = id
         self.routeID = routeID
@@ -101,6 +131,9 @@ struct MailThread: Identifiable, Hashable, Codable {
         self.isUnread = isUnread
         self.isStarred = isStarred
         self.tags = tags
+        self.lane = lane
+        self.summary = summary
+        self.isScreeningCandidate = isScreeningCandidate
     }
 
     var latestMessage: MailMessage? {
@@ -114,10 +147,27 @@ struct MailThread: Identifiable, Hashable, Codable {
     var lastUpdated: Date {
         latestMessage?.sentAt ?? .distantPast
     }
+
+    var messageCount: Int {
+        messages.count
+    }
+
+    var hasAttachments: Bool {
+        messages.contains { !$0.attachments.isEmpty }
+    }
 }
 
-struct ComposeDraft: Equatable {
+struct ComposeDraft: Equatable, Codable {
     var to = ""
+    var cc = ""
+    var from = ""
     var subject = ""
     var body = ""
+
+    var isEmpty: Bool {
+        to.trimmingCharacters(in: .whitespacesAndNewlines).isEmpty &&
+            cc.trimmingCharacters(in: .whitespacesAndNewlines).isEmpty &&
+            subject.trimmingCharacters(in: .whitespacesAndNewlines).isEmpty &&
+            body.trimmingCharacters(in: .whitespacesAndNewlines).isEmpty
+    }
 }