feat: translate OpportunityPrioritizer component to English

Complete Spanish-to-English translation of the OpportunityPrioritizer component:

Translation Keys Added (en.json & es.json):
- opportunityPrioritizer.title: Prioritized Opportunities
- opportunityPrioritizer.subtitle: Initiative count with context
- opportunityPrioritizer.totalSavingsIdentified: Total Savings
- opportunityPrioritizer.quickWins/assistance/optimization: Tier labels
- opportunityPrioritizer.startHere: START HERE badge
- opportunityPrioritizer.priority1: Priority #1
- opportunityPrioritizer.nextSteps: Next Steps
- opportunityPrioritizer.annualSavings/volume/timeline/months
- opportunityPrioritizer.allOpportunities: Section title
- opportunityPrioritizer.valueEffort: Value / Effort
- opportunityPrioritizer.methodology: Methodology note
- opportunityPrioritizer.tierLabels.{automate,assist,augment}
- opportunityPrioritizer.timelines.{automate,assist,augment}

Component Changes (OpportunityPrioritizer.tsx):
- Added useTranslation import and hook usage
- Replaced all hardcoded Spanish strings with t() calls
- Dynamic translation of tier labels and timelines
- Proper i18n for month ranges (inMonths with interpolation)

This completes the translation of all visible Spanish text in the
Roadmap tab's opportunity prioritization section.

https://claude.ai/code/session_c61d4539-cc2e-4386-8191-ec167cef65a5

frontend/locales/en.json

@@ -1820,5 +1820,41 @@
         }
       }
     }
+  },
+  "opportunityPrioritizer": {
+    "title": "Prioritized Opportunities",
+    "subtitle": "{{count}} initiatives ordered by savings potential and feasibility",
+    "whereAreOpportunities": "Where are opportunities?",
+    "totalSavingsIdentified": "Total Savings Identified",
+    "annual": "annual",
+    "quickWins": "Quick Wins (AUTOMATE)",
+    "assistance": "Assistance (ASSIST)",
+    "optimization": "Optimization (AUGMENT)",
+    "inMonths": "in {{months}} months",
+    "startHere": "START HERE",
+    "priority1": "Priority #1",
+    "annualSavings": "Annual Savings",
+    "volume": "Volume",
+    "timeline": "Timeline",
+    "months": "months",
+    "nextSteps": "Next Steps",
+    "allOpportunities": "All Prioritized Opportunities",
+    "savings": "Savings",
+    "valueEffort": "Value / Effort",
+    "value": "Value",
+    "effort": "Effort",
+    "viewMore": "View {{count}} more opportunities",
+    "methodology": "Prioritization methodology:",
+    "methodologyDescription": "Opportunities are ordered by TCO savings potential (volume × containment rate × CPI differential). AUTOMATE/ASSIST/AUGMENT tier classification is based on Agentic Readiness Score considering predictability (CV AHT), resolvability (FCR + Transfer), volume, data quality and process simplicity.",
+    "tierLabels": {
+      "automate": "Automate",
+      "assist": "Assist",
+      "augment": "Augment"
+    },
+    "timelines": {
+      "automate": "3-6 months",
+      "assist": "6-9 months",
+      "augment": "9-12 months"
+    }
   }
 }