fix: restore desktop startup and align tool previews with SDK updates

Add reflect-metadata bootstrap so desktop sidecar no longer crashes on startup.
Update SDK v1.4 compatibility for model variant and diff payload handling.
Unify write/edit/apply patch expanded previews and hide write success output noise.

test-ui-verification.ts

@@ -0,0 +1,16 @@
+// Test file for UI verification
+// Created: 2026-04-12
+
+const testConfig = {
+  name: "OpenChamber UI Verification",
+  version: "2.0.0-beta",
+  features: {
+    chat: true,
+    terminal: true,
+    settings: true
+  },
+  debug: true,
+  environment: "development"
+};
+
+export default testConfig;