[refactor] Replace manual semantic version utilities/functions with semver package (#5653)

## Summary
- Replace custom `compareVersions()` with `semver.compare()`
- Replace custom `isSemVer()` with `semver.valid()`  
- Remove deprecated version comparison functions from `formatUtil.ts`
- Update all version comparison logic across components and stores
- Fix tests to use semver mocking instead of formatUtil mocking

## Benefits
- **Industry standard**: Uses well-maintained, battle-tested `semver`
package
- **Better reliability**: Handles edge cases more robustly than custom
implementation
- **Consistent behavior**: All version comparisons now use the same
underlying logic
- **Type safety**: Better TypeScript support with proper semver types


Fixes #4787

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-5653-refactor-Replace-manual-semantic-version-utilities-functions-with-semver-package-2736d73d365081fb8498ee11cbcc10e2)
by [Unito](https://www.unito.io)

---------

Co-authored-by: DrJKL <DrJKL@users.noreply.github.com>
Co-authored-by: Claude <noreply@anthropic.com>

src/composables/nodePack/usePackUpdateStatus.ts

@@ -1,7 +1,7 @@
+import { compare, valid } from 'semver'
 import { computed } from 'vue'
 
 import type { components } from '@/types/comfyRegistryTypes'
-import { compareVersions, isSemVer } from '@/utils/formatUtil'
 import { useComfyManagerStore } from '@/workbench/extensions/manager/stores/comfyManagerStore'
 
 export const usePackUpdateStatus = (
@@ -16,14 +16,14 @@ export const usePackUpdateStatus = (
   const latestVersion = computed(() => nodePack.latest_version?.version)
 
   const isNightlyPack = computed(
-    () => !!installedVersion.value && !isSemVer(installedVersion.value)
+    () => !!installedVersion.value && !valid(installedVersion.value)
   )
 
   const isUpdateAvailable = computed(() => {
     if (!isInstalled.value || isNightlyPack.value || !latestVersion.value) {
       return false
     }
-    return compareVersions(latestVersion.value, installedVersion.value) > 0
+    return compare(latestVersion.value, installedVersion.value) > 0
   })
 
   return {

src/composables/nodePack/useUpdateAvailableNodes.ts

@@ -1,8 +1,8 @@
+import { compare, valid } from 'semver'
 import { computed, onMounted } from 'vue'
 
 import { useInstalledPacks } from '@/composables/nodePack/useInstalledPacks'
 import type { components } from '@/types/comfyRegistryTypes'
-import { compareVersions, isSemVer } from '@/utils/formatUtil'
 import { useComfyManagerStore } from '@/workbench/extensions/manager/stores/comfyManagerStore'
 
 /**
@@ -25,13 +25,13 @@ export const useUpdateAvailableNodes = () => {
     )
     const latestVersion = pack.latest_version?.version
 
-    const isNightlyPack = !!installedVersion && !isSemVer(installedVersion)
+    const isNightlyPack = !!installedVersion && !valid(installedVersion)
 
     if (isNightlyPack || !latestVersion) {
       return false
     }
 
-    return compareVersions(latestVersion, installedVersion) > 0
+    return compare(latestVersion, installedVersion) > 0
   }
 
   // Same filtering logic as ManagerDialogContent.vue