Added skills, shortcuts, and bugifixes++

oAI/Models/AgentSkill.swift

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+//
+//  AgentSkill.swift
+//  oAI
+//
+//  SKILL.md-style behavioral skills — markdown instruction files injected into the system prompt
+//
+
+import Foundation
+
+struct AgentSkill: Codable, Identifiable {
+    var id: UUID
+    var name: String              // display name, e.g. "Code Review"
+    var skillDescription: String  // short summary shown in the list
+    var content: String           // full markdown content (the actual instructions)
+    var isActive: Bool            // when true, injected into the system prompt
+    var createdAt: Date
+    var updatedAt: Date
+
+    init(id: UUID = UUID(), name: String, skillDescription: String = "", content: String,
+         isActive: Bool = true, createdAt: Date = Date(), updatedAt: Date = Date()) {
+        self.id = id
+        self.name = name
+        self.skillDescription = skillDescription
+        self.content = content
+        self.isActive = isActive
+        self.createdAt = createdAt
+        self.updatedAt = updatedAt
+    }
+
+    /// Extract a brief description from the content if skillDescription is empty
+    var resolvedDescription: String {
+        guard skillDescription.isEmpty else { return skillDescription }
+        // Return first non-heading, non-empty line
+        for line in content.components(separatedBy: .newlines) {
+            let trimmed = line.trimmingCharacters(in: .whitespaces)
+            if !trimmed.isEmpty && !trimmed.hasPrefix("#") {
+                return String(trimmed.prefix(100))
+            }
+        }
+        return name
+    }
+}

oAI/Models/Skill.swift

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+//
+//  Shortcut.swift
+//  oAI
+//
+//  User-defined slash command templates (prompt shortcuts/macros)
+//
+
+import Foundation
+
+struct Shortcut: Codable, Identifiable {
+    var id: UUID
+    var command: String      // e.g. "/summarize" (always starts with /)
+    var description: String  // shown in dropdown
+    var template: String     // prompt text, may contain {{input}}
+    var createdAt: Date
+    var updatedAt: Date
+
+    init(id: UUID = UUID(), command: String, description: String, template: String,
+         createdAt: Date = Date(), updatedAt: Date = Date()) {
+        self.id = id
+        self.command = command
+        self.description = description
+        self.template = template
+        self.createdAt = createdAt
+        self.updatedAt = updatedAt
+    }
+
+    /// True when the template uses {{input}} and needs the user to provide text
+    var needsInput: Bool {
+        template.contains("{{input}}")
+    }
+}