refactor(desktop): 라이선스 UI 빅뱅 — 키 입력 제거, 구독 기반 전환

- LicenseTab/LicenseModal: LemonSqueezy 키 입력 삭제, Payple 구독 UI로 전환
- useLicenseState 훅: 라이선스+클라우드 인증 공용 상태 관리 추출
- PREMIUM_MODEL_LIMITS: 3곳 중복 → @d3ro/core/constants 단일 소스
- i18n: LemonSqueezy 전용 키 18개 삭제, 구독 관련 키 13개 추가 (12 locale)
- DashboardPage: dashboard.model* → license.model* 키 통일

packages/i18n/src/locales/en.json

@@ -39,12 +39,6 @@
   "dashboard.backendLocal": "Local (Ollama)",
   "dashboard.backendPremium": "Premium (Claude)",
   "dashboard.loginRequired": "Login Required",
-  "dashboard.premiumQuota": "Premium Quota",
-  "dashboard.modelHaiku": "Haiku",
-  "dashboard.modelSonnet": "Sonnet",
-  "dashboard.modelOpus": "Opus",
-  "dashboard.quotaWeekly": "Weekly",
-  "dashboard.quotaDaily": "Daily",
   "history.title": "Transcription History",
   "history.search": "Search...",
   "history.entries": "{{count}} entries",
@@ -283,24 +277,11 @@
   "license.free": "FREE",
   "license.pro": "PRO",
   "license.proPlus": "PRO+",
-  "license.activate": "Activate License",
-  "license.deactivate": "Deactivate",
-  "license.keyPlaceholder": "Enter license key...",
-  "license.activating": "Activating...",
-  "license.activated": "Activated",
-  "license.activateError": "Activation failed: {{message}}",
-  "license.deactivated": "Deactivated",
-  "license.machineId": "Machine ID",
-  "license.activatedAt": "Activated At",
-  "license.manageLicense": "Manage License",
   "license.subscribe": "Subscribe",
   "license.upgrade": "Upgrade",
   "license.currentPlan": "Current Plan",
   "license.proPlan": "Pro — ₩9,900/mo",
   "license.proPlusPlan": "Pro+ — ₩29,900/mo",
-  "license.paymentPending": "Payment integration coming soon (Payple)",
-  "license.upgradeTitle": "Upgrade to Pro",
-  "license.upgradeDesc": "Unlock all features",
   "license.quotaUsed": "{{used}}/{{limit}} used",
   "license.quotaUnlimited": "Unlimited",
   "license.tierComparison": "Tier Comparison",
@@ -340,7 +321,6 @@
   "license.proPlus.required": "PRO+ Required",
   "license.included": "Included",
   "license.notIncluded": "Not included",
-  "license.keyLabel": "License Key",
   "license.quotaExceeded.title": "You've used all your daily {{feature}}",
   "license.quotaExceeded.desc": "Upgrade to Pro for unlimited usage",
   "license.tierRequired.title": "{{feature}} is a {{tier}} feature",
@@ -360,6 +340,19 @@
   "license.unlimited": "Unlimited",
   "license.locked": "Locked",
   "license.nav": "License",
+  "license.signInRequired": "Sign in to manage your subscription",
+  "license.signInToUpgrade": "Sign in to upgrade",
+  "license.subscriptionActive": "Subscription active",
+  "license.subscriptionManage": "Manage subscription",
+  "license.upgradeToProDesc": "Unlock Premium AI models, cloud sync, and more",
+  "license.currentPlanActive": "Your current plan",
+  "license.openBillingPage": "Open billing page",
+  "license.premiumQuota": "Premium Quota",
+  "license.modelHaiku": "Haiku",
+  "license.modelSonnet": "Sonnet",
+  "license.modelOpus": "Opus",
+  "license.quotaWeekly": "weekly",
+  "license.quotaDaily": "daily",
   "fileTranscription.title": "File Transcription",
   "fileTranscription.dropZone": "Drop audio/video file here",
   "fileTranscription.dropZoneHint": "Supports MP3, WAV, M4A, MP4, MKV, WEBM",