refactor: Remove reasoning message styling to streamline dark mode implementation

Author: devanshjainms

client/src/components/chat/HeadlessChat.tsx

@@ -49,9 +49,6 @@ function SapChatInner() {
           assistantMessage: {
             toolCallsView: "cpk-tool-calls-dark",
           },
-          reasoningMessage: {
-            className: "cpk-reasoning-expanded",
-          },
         }}
         labels={{
           modalHeaderTitle: "SAP Assistant",

client/src/index.css

@@ -29,17 +29,6 @@ html, body, #root {
 
 /* ── CopilotKit dark-mode overrides for hardcoded Tailwind whites ── */
 
-/* Reasoning / thinking section — expanded by default, VS Code style */
-.cpk-reasoning-expanded [data-state="closed"] {
-  display: block !important;
-}
-.cpk-reasoning-expanded [data-state="closed"] > [class*="content"],
-.cpk-reasoning-expanded [data-state="closed"] + div {
-  display: block !important;
-  max-height: none !important;
-  opacity: 1 !important;
-}
-
 /* Tool-call cards — override bg-white from CopilotKit defaults */
 .dark [data-copilotkit] [data-variant] {
   background-color: var(--card) !important;