Initial MVP skeleton with auth, chat persistence, UI and text LLM integration

frontend/app/globals.css

@@ -0,0 +1,36 @@
+@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600&display=swap');
+
+:root {
+  --bg-color: #f5f6f8;
+  --panel-bg: #ffffff;
+  --text-main: #333333;
+  --text-muted: #888888;
+  --border-color: #e5e7eb;
+  --primary: #4a76a8;
+  --primary-hover: #3d628f;
+  --sidebar-w: 260px;
+}
+
+body, html {
+  margin: 0;
+  padding: 0;
+  font-family: 'Inter', sans-serif;
+  background-color: var(--bg-color);
+  color: var(--text-main);
+  height: 100vh;
+  box-sizing: border-box;
+}
+
+* {
+  box-sizing: inherit;
+}
+
+a {
+  text-decoration: none;
+  color: inherit;
+}
+
+button {
+  cursor: pointer;
+  font-family: 'Inter', sans-serif;
+}