fix(emcn): resolve Calendar icon/component barrel collision and preserve prism side effects (#5261)

Two post-extraction regressions:

1. The barrel resolves the Calendar name-collision to the date-picker COMPONENT (symmetric with Table). Scheduled-tasks imported Calendar from the barrel but used it as an ICON, so its header rendered a date picker. Route the icon consumers (scheduled-tasks + loading) to @sim/emcn/icons, matching the 'icons come from the /icons subpath' convention.

2. The package's new sideEffects: ['**/*.css'] marked code/prism.ts as side-effect-free, but it registers prismjs languages on the global Prism (a real JS side effect). The bundler could drop/reorder its core init, causing 'Prism is not defined'. Add code/prism.ts to sideEffects so the bundler preserves it.

apps/sim/app/workspace/[workspaceId]/scheduled-tasks/loading.tsx

@@ -1,6 +1,6 @@
 'use client'
 
-import { Calendar, Plus } from '@sim/emcn'
+import { Calendar, Plus } from '@sim/emcn/icons'
 import {
   type ChromeActionSpec,
   ResourceChromeFallback,

apps/sim/app/workspace/[workspaceId]/scheduled-tasks/scheduled-tasks.tsx

@@ -1,7 +1,7 @@
 'use client'
 
 import { useCallback, useMemo, useState } from 'react'
-import { Calendar, Plus } from '@sim/emcn'
+import { Calendar, Plus } from '@sim/emcn/icons'
 import { useParams } from 'next/navigation'
 import type { ResourceAction } from '@/app/workspace/[workspaceId]/components'
 import { Resource } from '@/app/workspace/[workspaceId]/components'

packages/emcn/package.json

@@ -3,7 +3,8 @@
   "version": "0.1.0",
   "private": true,
   "sideEffects": [
-    "**/*.css"
+    "**/*.css",
+    "**/components/code/prism.ts"
   ],
   "type": "module",
   "license": "Apache-2.0",