feat: update chat layout and session management

- Added max-width to chat controls and session select for better layout.
- Increased CHAT_SESSIONS_ACTIVE_MINUTES from 10 to 120 for extended session duration.
- Changed brand logo source to a local favicon for improved asset management.

ui/src/styles/chat/layout.css

@@ -295,6 +295,7 @@
 
 .chat-controls__session {
   min-width: 140px;
+  max-width: 420px;
 }
 
 .chat-controls__thinking {
@@ -361,6 +362,9 @@
 .chat-controls__session select {
   padding: 6px 10px;
   font-size: 13px;
+  max-width: 420px;
+  overflow: hidden;
+  text-overflow: ellipsis;
 }
 
 .chat-controls__thinking {

ui/src/ui/app-chat.ts

@@ -24,7 +24,7 @@ type ChatHost = {
   refreshSessionsAfterChat: Set<string>;
 };
 
-export const CHAT_SESSIONS_ACTIVE_MINUTES = 10;
+export const CHAT_SESSIONS_ACTIVE_MINUTES = 120;
 
 export function isChatBusy(host: ChatHost) {
   return host.chatSending || Boolean(host.chatRunId);

ui/src/ui/app-render.ts

@@ -132,7 +132,7 @@ export function renderApp(state: AppViewState) {
           </button>
           <div class="brand">
             <div class="brand-logo">
-              <img src="https://mintcdn.com/clawhub/4rYvG-uuZrMK_URE/assets/pixel-lobster.svg?fit=max&auto=format&n=4rYvG-uuZrMK_URE&q=85&s=da2032e9eac3b5d9bfe7eb96ca6a8a26" alt="OpenClaw" />
+              <img src="/favicon.svg" alt="OpenClaw" />
             </div>
             <div class="brand-text">
               <div class="brand-title">OPENCLAW</div>