theme: build out the theme engine core with resolve pipeline

crates/theme/Cargo.toml

@@ -5,4 +5,28 @@ edition = "2024"
 description = "Native theme engine: reads the OS theme and resolves it into semantic tokens"
 
 [dependencies]
+anyhow = "1"
 gpui = { workspace = true }
+serde = { version = "1", features = ["derive"] }
+toml = "0.8"
+
+[target.'cfg(target_os = "macos")'.dependencies]
+block2 = "0.6"
+objc2 = "0.6"
+objc2-app-kit = { version = "0.3.2", default-features = false, features = [
+    "NSAccessibility",
+    "NSAppearance",
+    "NSColor",
+    "NSColorSpace",
+    "NSWorkspace",
+    "block2",
+    "objc2-core-foundation",
+] }
+objc2-foundation = { version = "=0.3.2", default-features = false, features = [
+    "NSDistributedNotificationCenter",
+    "NSNotification",
+    "NSOperation",
+    "NSString",
+    "block2",
+    "std",
+] }