macos: use value-style AppleScript surface configuration records

Add a `surface configuration` record type to the scripting dictionary,
implement `new surface configuration` (with optional copy-from), and allow
`new window` to accept `with configuration`.

macos/Sources/Features/AppleScript/ScriptSurfaceConfiguration.swift

@@ -0,0 +1,136 @@
+import Foundation
+
+/// AppleScript record support for `Ghostty.SurfaceConfiguration`.
+///
+/// This keeps scripting conversion at the data-structure boundary so AppleScript
+/// can pass records by value (`new surface configuration`, assign, copy, mutate)
+/// without introducing an additional wrapper type.
+extension Ghostty.SurfaceConfiguration: ScriptRecord {
+    init(scriptRecord source: NSDictionary?) throws {
+        self.init()
+
+        guard let raw = source as? [String: Any] else {
+            throw RecordParseError.invalidType(parameter: "configuration", expected: "a surface configuration record")
+        }
+
+        if let rawFontSize = raw["fontSize"] {
+            guard let number = rawFontSize as? NSNumber else {
+                throw RecordParseError.invalidType(parameter: "font size", expected: "a number")
+            }
+
+            let value = number.doubleValue
+            guard value.isFinite else {
+                throw RecordParseError.invalidValue(parameter: "font size", message: "must be a finite number")
+            }
+
+            if value < 0 {
+                throw RecordParseError.invalidValue(parameter: "font size", message: "must be a positive number")
+            }
+
+            if value > 0 {
+                fontSize = Float32(value)
+            }
+        }
+
+        if let rawWorkingDirectory = raw["workingDirectory"] {
+            guard let workingDirectory = rawWorkingDirectory as? String else {
+                throw RecordParseError.invalidType(parameter: "working directory", expected: "text")
+            }
+
+            if !workingDirectory.isEmpty {
+                self.workingDirectory = workingDirectory
+            }
+        }
+
+        if let rawCommand = raw["command"] {
+            guard let command = rawCommand as? String else {
+                throw RecordParseError.invalidType(parameter: "command", expected: "text")
+            }
+
+            if !command.isEmpty {
+                self.command = command
+            }
+        }
+
+        if let rawInitialInput = raw["initialInput"] {
+            guard let initialInput = rawInitialInput as? String else {
+                throw RecordParseError.invalidType(parameter: "initial input", expected: "text")
+            }
+
+            if !initialInput.isEmpty {
+                self.initialInput = initialInput
+            }
+        }
+
+        if let rawWaitAfterCommand = raw["waitAfterCommand"] {
+            if let boolValue = rawWaitAfterCommand as? Bool {
+                waitAfterCommand = boolValue
+            } else if let numericValue = rawWaitAfterCommand as? NSNumber {
+                waitAfterCommand = numericValue.boolValue
+            } else {
+                throw RecordParseError.invalidType(parameter: "wait after command", expected: "boolean")
+            }
+        }
+
+        if let assignments = raw["environmentVariables"] as? [String], !assignments.isEmpty {
+            environmentVariables = try Self.parseScriptEnvironmentAssignments(assignments)
+        }
+    }
+
+    var dictionaryRepresentation: NSDictionary {
+        var record: [String: Any] = [
+            "fontSize": 0,
+            "workingDirectory": "",
+            "command": "",
+            "initialInput": "",
+            "waitAfterCommand": false,
+            "environmentVariables": [String](),
+        ]
+
+        if let fontSize {
+            record["fontSize"] = NSNumber(value: fontSize)
+        }
+
+        if let workingDirectory {
+            record["workingDirectory"] = workingDirectory
+        }
+
+        if let command {
+            record["command"] = command
+        }
+
+        if let initialInput {
+            record["initialInput"] = initialInput
+        }
+
+        if waitAfterCommand {
+            record["waitAfterCommand"] = true
+        }
+
+        if !environmentVariables.isEmpty {
+            record["environmentVariables"] = environmentVariables.map { "\($0.key)=\($0.value)" }
+        }
+
+        return record as NSDictionary
+    }
+
+    private static func parseScriptEnvironmentAssignments(_ assignments: [String]) throws -> [String: String] {
+        var result: [String: String] = [:]
+
+        for assignment in assignments {
+            guard let separator = assignment.firstIndex(of: "=") else {
+                throw RecordParseError.invalidValue(
+                    parameter: "environment variables",
+                    message: "expected KEY=VALUE, got \"\(assignment)\""
+                )
+            }
+
+            let key = String(assignment[..<separator])
+            let valueStart = assignment.index(after: separator)
+            let value = String(assignment[valueStart...])
+            result[key] = value
+        }
+
+        return result
+    }
+}