feat: add ENTERPRISE tier label mapping

Adds ENTERPRISE to the workspace tier-label lookup so an enterprise
subscription renders its display name instead of a blank string
(tierKeyMap is a loose Record<string, string> that silently returns
'' for unmapped keys, so this gap wasn't caught by types).

- src/platform/workspace/composables/useWorkspaceTierLabel.ts: add
  ENTERPRISE -> enterprise mapping
- src/locales/en/main.json: add subscription.tiers.enterprise.name
- useWorkspaceTierLabel.test.ts: cover the new mapping directly and
  via the plan-slug fallback; the prior "unknown tier" fallback test
  used ENTERPRISE_CUSTOM as its example, which now matches, so it was
  swapped for an example that stays unmapped

Author: wei-hai

src/locales/en/main.json

@@ -2878,6 +2878,9 @@
       "pro": {
         "name": "Pro",
         "feature1": "Longer workflow runtime (up to 1 hr)"
+      },
+      "enterprise": {
+        "name": "Enterprise"
       }
     },
     "required": {

src/platform/workspace/composables/useWorkspaceTierLabel.test.ts

@@ -12,7 +12,8 @@ vi.mock('vue-i18n', () => ({
         'subscription.tiers.standard.name': 'Standard',
         'subscription.tiers.creator.name': 'Creator',
         'subscription.tiers.pro.name': 'Pro',
-        'subscription.tiers.founder.name': "Founder's Edition"
+        'subscription.tiers.founder.name': "Founder's Edition",
+        'subscription.tiers.enterprise.name': 'Enterprise'
       }
       return tierNames[key] ?? key
     })
@@ -52,6 +53,10 @@ describe('useWorkspaceTierLabel', () => {
       )
     })
 
+    it('maps ENTERPRISE to enterprise label', () => {
+      expect(formatTierName('ENTERPRISE', false)).toBe('Enterprise')
+    })
+
     it('falls back to standard for unknown tier', () => {
       expect(formatTierName('UNKNOWN_TIER', false)).toBe('')
     })
@@ -106,12 +111,21 @@ describe('useWorkspaceTierLabel', () => {
     it('returns null when plan slug does not match any known tier', () => {
       const result = getTierLabel({
         isSubscribed: true,
-        subscriptionPlan: 'ENTERPRISE_CUSTOM',
+        subscriptionPlan: 'UNKNOWN_CUSTOM',
         subscriptionTier: null
       })
       expect(result).toBeNull()
     })
 
+    it('parses ENTERPRISE from plan slug fallback', () => {
+      const result = getTierLabel({
+        isSubscribed: true,
+        subscriptionPlan: 'ENTERPRISE_MONTHLY',
+        subscriptionTier: null
+      })
+      expect(result).toBe('Enterprise')
+    })
+
     it('handles FOUNDERS_EDITION tier', () => {
       const result = getTierLabel({
         isSubscribed: true,

src/platform/workspace/composables/useWorkspaceTierLabel.ts

@@ -8,7 +8,8 @@ const tierKeyMap: Record<string, string> = {
   CREATOR: 'creator',
   PRO: 'pro',
   FOUNDER: 'founder',
-  FOUNDERS_EDITION: 'founder'
+  FOUNDERS_EDITION: 'founder',
+  ENTERPRISE: 'enterprise'
 }
 
 interface WorkspaceSubscriptionInfo {