feat: migrate to OpenCode SDK v2

Update all import statements to use @opencode-ai/sdk/v2
Modify Vite configurations to alias new SDK path
Update API client method signatures for SDK v2 compatibility

packages/ui/src/components/session/DirectoryTree.tsx

@@ -400,10 +400,8 @@ export const DirectoryTree: React.FC<DirectoryTreeProps> = ({
 
         const tempClient = opencodeClient.getApiClient();
         const response = await tempClient.file.list({
-          query: {
-            path: '.',
-            directory: path
-          }
+          path: '.',
+          directory: path
         });
 
         if (!response.data) {