feat: improve chat streaming UX and add Mermaid diagram rendering (#438)

* feat: show current branch in empty chat state

* fix: display current git branch for worktrees and update them with branch change

* refactor: improve read tool output parsing with structured data

* feat: add support for message part delta events

* fix(chat): improve streaming rendering, scroll behavior, and assistant action visibility

* feat: Add mermaid diagram support to chat markdown rendering

* fix: update table download functionality to include success notification and remove unused MarkdownRenderer import

* refactor: streamline Streamdown component props for improved readability

* fix: preserve Streamdown code-block markers and use native Tauri cache clearing

* feat: add context overview panel to view conversation details

packages/ui/src/components/chat/ChatContainer.tsx

@@ -341,10 +341,10 @@ export const ChatContainer: React.FC = () => {
 
                 if (!shouldSkipScroll) {
                     if (typeof window === 'undefined') {
-                        scrollToBottom();
+                        scrollToBottom({ instant: true });
                     } else {
                         window.requestAnimationFrame(() => {
-                            scrollToBottom();
+                            scrollToBottom({ instant: true });
                         });
                     }
                 }
@@ -372,7 +372,7 @@ export const ChatContainer: React.FC = () => {
                 style={isMobile ? { paddingBottom: 'var(--oc-keyboard-inset, 0px)' } : undefined}
             >
                 <div className="flex-1 flex items-center justify-center">
-                    <ChatEmptyState />
+                    <ChatEmptyState showDraftContext />
                 </div>
                 <div className="relative bg-background/95 backdrop-blur supports-[backdrop-filter]:bg-background/80 z-10">
                     <ChatInput scrollToBottom={scrollToBottom} />