feat(macos): onboard Claude OAuth + identity

apps/macos/Sources/Clawdis/AgentIdentity.swift

@@ -0,0 +1,44 @@
+import Foundation
+
+struct AgentIdentity: Codable, Equatable {
+    var name: String
+    var theme: String
+    var emoji: String
+
+    var isEmpty: Bool {
+        self.name.trimmingCharacters(in: .whitespacesAndNewlines).isEmpty &&
+            self.theme.trimmingCharacters(in: .whitespacesAndNewlines).isEmpty &&
+            self.emoji.trimmingCharacters(in: .whitespacesAndNewlines).isEmpty
+    }
+}
+
+enum AgentIdentityEmoji {
+    static func suggest(theme: String) -> String {
+        let normalized = theme.trimmingCharacters(in: .whitespacesAndNewlines).lowercased()
+        if normalized.isEmpty { return "🦞" }
+
+        let table: [(needle: String, emoji: String)] = [
+            ("lobster", "🦞"),
+            ("sloth", "🦥"),
+            ("space", "🪐"),
+            ("rocket", "🚀"),
+            ("astronaut", "🧑‍🚀"),
+            ("octopus", "🐙"),
+            ("crab", "🦀"),
+            ("shark", "🦈"),
+            ("cat", "🐈"),
+            ("dog", "🐕"),
+            ("owl", "🦉"),
+            ("fox", "🦊"),
+            ("robot", "🤖"),
+            ("wizard", "🧙"),
+            ("ninja", "🥷"),
+        ]
+
+        for entry in table where normalized.contains(entry.needle) {
+            return entry.emoji
+        }
+        return "🦞"
+    }
+}
+