feat(terminal) refactoring and stability improvements (#98)

* feat(terminal): replace xterm with ghostty-web

Replace xterm.js terminal with ghostty-web implementation
Add terminal serialization support for state restoration
Apply custom patches to ghostty-web for enhancements

* feat(terminal): add bun-pty backend support

Switch terminal to ghostty-web with bun-pty backend for better performance
Auto-detect and prefer Bun runtime when available for terminal sessions
Update terminal viewport write queue handling for improved reliability

* fix(terminal): prevent unnecessary resize events

Only report terminal resize when dimensions actually change
Simplify chunk processing state tracking
Disable terminal transparency for consistent rendering

* feat(terminal): increase scrollback and buffer limits

Increase terminal scrollback buffer from 10k to 50k lines
Increase terminal buffer limit from 256k to 1M bytes
Add rate limiting and improve output handling for terminal streams

vite.config.ts

@@ -17,6 +17,9 @@ export default defineConfig({
       '@opencode-ai/sdk': path.resolve(__dirname, './node_modules/@opencode-ai/sdk/dist/client.js'),
     },
   },
+  worker: {
+    format: 'es',
+  },
   define: {
     'process.env': {},
     global: 'globalThis',