feat: complete Spanish-to-English translation for AgenticReadinessTab

Added remaining translation keys and updated all hardcoded Spanish strings:
- Added new translation keys to en.json and es.json (emptyStates, sections subsections)
- Updated table headers (skill classification, tier sections, queue details)
- Converted TIER_SECTION_CONFIG to getTierSectionConfig(t) function
- Updated TierQueueSection and HumanOnlyByReasonSection components to use translations
- Translated section titles, summary text, and inline labels
- Build verified successfully

https://claude.ai/code/session_03272424-c661-4002-a75e-2f81579fdd6e

frontend/locales/en.json

@@ -1186,6 +1186,53 @@
         "notRecommended": "Not recommended for automation at this time",
         "bronzeAnalysis": "Bronze analysis does not include Agentic Readiness Score"
       }
+    },
+    "table": {
+      "queueId": "Queue (original_queue_id)",
+      "volume": "Volume",
+      "aht": "AHT",
+      "cv": "CV",
+      "transfer": "Transfer",
+      "fcr": "FCR",
+      "score": "Score",
+      "tier": "Tier",
+      "redFlags": "Red Flags",
+      "savingsPerMonth": "Savings/mo",
+      "total": "TOTAL",
+      "skill": "Skill",
+      "queues": "Queues",
+      "avgAht": "Avg AHT",
+      "avgCv": "Avg CV",
+      "potentialSavings": "Potential Savings",
+      "dominantTier": "Dominant Tier",
+      "perYear": "/year"
+    },
+    "summary": {
+      "queuesAnalyzed": "queues analyzed",
+      "volumeInIndividualQueues": "of volume is in individual queues",
+      "balancedDistribution": "Balanced distribution across tiers. Review individual queues for prioritization.",
+      "clickToExpand": "Click on a skill to see individual queue details"
+    },
+    "emptyStates": {
+      "noQueuesClassifiedAs": "No queues classified as {{tier}}",
+      "noQueuesMatchFilters": "No queues match the selected filters"
+    },
+    "sections": {
+      "classificationBySkill": "CLASSIFICATION BY SKILL",
+      "classificationByTier": "CLASSIFICATION BY AUTOMATION TIER",
+      "queuesAutomate": "Queues AUTOMATE",
+      "readyForFullAutomation": "Ready for full automation with virtual agent (Score ≥7.5)",
+      "queuesAssist": "Queues ASSIST",
+      "candidatesForCopilot": "Candidates for Copilot - AI assists human agent (Score 5.5-7.5)",
+      "queuesAugment": "Queues AUGMENT",
+      "requireOptimization": "Require prior optimization: standardize processes, reduce variability (Score 3.5-5.5)",
+      "queuesHumanOnly": "Queues HUMAN-ONLY",
+      "notSuitableForAutomation": "Not suitable for automation: insufficient volume, low data quality, or extreme complexity",
+      "queuesIn": "queues in {{count}} skills",
+      "costPerYear": "/year",
+      "volumeColon": "Volume:",
+      "costColon": "Cost:",
+      "potentialSavingsColon": "Potential savings:"
     }
   },
   "economicModel": {