feat: implement full context-scoped AI chat UI in AIChatPanel

- Added AIChatPanel component with context header, user and AI message handling.
- Integrated streaming responses via IPC and error handling for chat mutations.
- Enhanced user experience with input handling and auto-scrolling features.
- Updated AppShell to derive AI chat context from the current route.
- Introduced ScrollArea component for better scrolling behavior in various dialogs.
- Added support for Tailwind typography and improved global styles.
- Updated project and task dialogs to utilize ScrollArea for better UX.

src/renderer/globals.css

@@ -5,6 +5,7 @@
 @import "tailwindcss";
 @import "tw-animate-css";
 @import "shadcn/tailwind.css";
+@plugin "@tailwindcss/typography";
 
 @custom-variant dark (&:is(.dark *));
 
@@ -128,7 +129,7 @@
 }
 
 body {
-  font-family: 'Geist', 'Inter', system-ui, sans-serif;
+  font-family: 'Geist', 'Inter', system-ui, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', 'Noto Color Emoji';
   -webkit-font-smoothing: antialiased;
   margin: 0;
   overflow: hidden; /* Electron: no OS scrollbars */