Extract shared utilities into workspace package (#5843)

## Summary

Extracts shared formatting and network utilities into dedicated
workspace package.

## Changes

- **What**: Created `@comfyorg/shared-frontend-utils` package containing
formatUtil and networkUtil
- **Breaking**: None - utilities remain accessible via path aliases in
`tsconfig`

Split `createAnnotatedPath` and `electronMirrorCheck` out and left in
frontend, due to their tightly-coupled nature. See [discussion on this
PR](https://github.com/Comfy-Org/ComfyUI_frontend/pull/5843#issuecomment-3344724727).

src/utils/createAnnotatedPath.ts

@@ -0,0 +1,23 @@
+import type { ResultItem } from '@/schemas/apiSchema'
+
+const hasAnnotation = (filepath: string): boolean =>
+  /\[(input|output|temp)\]/i.test(filepath)
+
+const createAnnotation = (filepath: string, rootFolder = 'input'): string =>
+  !hasAnnotation(filepath) && rootFolder !== 'input' ? ` [${rootFolder}]` : ''
+
+const createPath = (filename: string, subfolder = ''): string =>
+  subfolder ? `${subfolder}/${filename}` : filename
+
+/** Creates annotated filepath in format used by folder_paths.py */
+export function createAnnotatedPath(
+  item: string | ResultItem,
+  options: { rootFolder?: string; subfolder?: string } = {}
+): string {
+  const { rootFolder = 'input', subfolder } = options
+  if (typeof item === 'string')
+    return `${createPath(item, subfolder)}${createAnnotation(item, rootFolder)}`
+  return `${createPath(item.filename ?? '', item.subfolder)}${
+    item.type ? createAnnotation(item.type, rootFolder) : ''
+  }`
+}