feat: code splitting optimization - reduce initial bundle by 36% (#8542)

## Summary

Reduces initial module preload from 12.94 MB to 8.24 MB (-4.7 MB, -36%).

## Changes

- Split vendor chunks for better cache isolation (firebase, sentry,
i18n, zod, etc.)
- Exclude heavy optional chunks from initial preload: THREE.js, xterm,
tiptap, chart.js, yjs
- Lazy load 16 dialog components in dialogService
- Add \endor-yjs\ chunk for CRDT library

## Metrics

| Metric | Before | After |
|--------|--------|-------|
| Initial preload | 12.94 MB | 8.24 MB |
| vendor-other | 4,006 KB | 2,156 KB |
| dialogService | 1,860 KB | 1,304 KB |

All excluded chunks still load on-demand when their features are used.

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-8542-feat-code-splitting-optimization-reduce-initial-bundle-by-36-2fb6d73d36508146aaf7fdaed3274033)
by [Unito](https://www.unito.io)

---------

Co-authored-by: Amp <amp@ampcode.com>
Co-authored-by: github-actions <github-actions@github.com>

src/workbench/extensions/manager/composables/useImportFailedDetection.ts

@@ -33,7 +33,7 @@ function createImportFailedDialog() {
     onClose?: () => void
   ) => {
     if (conflictedPackages && conflictedPackages.length > 0) {
-      showImportFailedNodeDialog({
+      void showImportFailedNodeDialog({
         conflictedPackages,
         dialogComponentProps: {
           onClose

src/workbench/extensions/manager/composables/useManagerState.ts

@@ -153,7 +153,7 @@ export function useManagerState() {
 
     switch (state) {
       case ManagerUIState.DISABLED:
-        dialogService.showSettingsDialog('extension')
+        void dialogService.showSettingsDialog('extension')
         break
 
       case ManagerUIState.LEGACY_UI: {
@@ -173,7 +173,7 @@ export function useManagerState() {
           }
           // Fallback to extensions panel if not showing toast
           if (options?.showToastOnLegacyError === false) {
-            dialogService.showSettingsDialog('extension')
+            void dialogService.showSettingsDialog('extension')
           }
         }
         break