[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>

tests-ui/tests/composables/useUpdateAvailableNodes.test.ts

@@ -1,10 +1,9 @@
+import { compare, valid } from 'semver'
 import { beforeEach, describe, expect, it, vi } from 'vitest'
 import { nextTick, ref } from 'vue'
 
 import { useInstalledPacks } from '@/composables/nodePack/useInstalledPacks'
 import { useUpdateAvailableNodes } from '@/composables/nodePack/useUpdateAvailableNodes'
-// Import mocked utils
-import { compareVersions, isSemVer } from '@/utils/formatUtil'
 import { useComfyManagerStore } from '@/workbench/extensions/manager/stores/comfyManagerStore'
 
 // Mock Vue's onMounted to execute immediately for testing
@@ -25,16 +24,16 @@ vi.mock('@/workbench/extensions/manager/stores/comfyManagerStore', () => ({
   useComfyManagerStore: vi.fn()
 }))
 
-vi.mock('@/utils/formatUtil', () => ({
-  compareVersions: vi.fn(),
-  isSemVer: vi.fn()
+vi.mock('semver', () => ({
+  compare: vi.fn(),
+  valid: vi.fn()
 }))
 
 const mockUseInstalledPacks = vi.mocked(useInstalledPacks)
 const mockUseComfyManagerStore = vi.mocked(useComfyManagerStore)
 
-const mockCompareVersions = vi.mocked(compareVersions)
-const mockIsSemVer = vi.mocked(isSemVer)
+const mockSemverCompare = vi.mocked(compare)
+const mockSemverValid = vi.mocked(valid)
 
 describe('useUpdateAvailableNodes', () => {
   const mockInstalledPacks = [
@@ -86,19 +85,19 @@ describe('useUpdateAvailableNodes', () => {
       }
     })
 
-    mockIsSemVer.mockImplementation(
-      (version: string): version is `${number}.${number}.${number}` => {
-        return !version.includes('nightly')
-      }
-    )
+    mockSemverValid.mockImplementation((version) => {
+      return version &&
+        typeof version === 'string' &&
+        !version.includes('nightly')
+        ? version
+        : null
+    })
 
-    mockCompareVersions.mockImplementation(
-      (latest: string | undefined, installed: string | undefined) => {
-        if (latest === '2.0.0' && installed === '1.0.0') return 1 // outdated
-        if (latest === '1.0.0' && installed === '1.0.0') return 0 // up to date
-        return 0
-      }
-    )
+    mockSemverCompare.mockImplementation((latest, installed) => {
+      if (latest === '2.0.0' && installed === '1.0.0') return 1 // outdated
+      if (latest === '1.0.0' && installed === '1.0.0') return 0 // up to date
+      return 0
+    })
 
     mockUseComfyManagerStore.mockReturnValue({
       isPackInstalled: mockIsPackInstalled,
@@ -322,10 +321,10 @@ describe('useUpdateAvailableNodes', () => {
       // Access the computed to trigger the logic
       expect(updateAvailableNodePacks.value).toBeDefined()
 
-      expect(mockCompareVersions).toHaveBeenCalledWith('2.0.0', '1.0.0')
+      expect(mockSemverCompare).toHaveBeenCalledWith('2.0.0', '1.0.0')
     })
 
-    it('calls isSemVer to check nightly versions', () => {
+    it('calls semver.valid to check nightly versions', () => {
       mockUseInstalledPacks.mockReturnValue({
         installedPacks: ref([mockInstalledPacks[2]]), // pack-3: nightly
         isLoading: ref(false),
@@ -338,7 +337,7 @@ describe('useUpdateAvailableNodes', () => {
       // Access the computed to trigger the logic
       expect(updateAvailableNodePacks.value).toBeDefined()
 
-      expect(mockIsSemVer).toHaveBeenCalledWith('nightly-abc123')
+      expect(mockSemverValid).toHaveBeenCalledWith('nightly-abc123')
     })
 
     it('calls isPackInstalled for each pack', () => {