Kill off agents pane now that we have FAB (#6613)

# Description of Changes
Kill off agents pane now that we have the FAB. Also fixes a bug with the
FAB where it would sometimes fail to render the chat, and fixes a
duplicated entry in the Vite config which was throwing a warning

frontend/editor/vite.config.ts

@@ -242,11 +242,6 @@ export default defineConfig(async ({ mode }) => {
         },
       },
     },
-    resolve: {
-      alias: {
-        "@shared": path.resolve(__dirname, "../shared"),
-      },
-    },
     optimizeDeps: {
       exclude: ["@embedpdf/pdfium"],
     },