feat: i18n — EN/MS/ZH translations with cookie-based locale switching, report form translated

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01FFDuBhMKvoWjrWT3ZnGmmr

messages/en.json

@@ -0,0 +1,36 @@
+{
+  "ReportForm": {
+    "title": "Report an Incident",
+    "incidentTypeLabel": "Incident type",
+    "incidentTypePlaceholder": "Select type…",
+    "descriptionLabel": "What happened?",
+    "descriptionPlaceholder": "Describe what happened, where, and any immediate actions taken…",
+    "injuryInvolved": "Person was injured",
+    "treatmentLevel": "Treatment level",
+    "treatmentPlaceholder": "Select treatment…",
+    "assetInvolved": "Equipment / asset was damaged",
+    "filesLabel": "Photos / Videos / Documents",
+    "submitButton": "Submit Incident Report",
+    "submitting": "Submitting…",
+    "submitAnyway": "Submit anyway",
+    "qualityScoreLabel": "Report quality — {score}/10",
+    "errorGeneric": "Something went wrong. Please try again.",
+    "savedOffline": "Report saved. It will be submitted automatically when you're back online.",
+    "offlineBanner": "You're offline. Your report will be saved and submitted when you reconnect."
+  },
+  "IncidentType": {
+    "injury": "Injury / Medical",
+    "near_miss": "Near Miss",
+    "hazard": "Hazard / Unsafe Condition",
+    "asset_damage": "Asset / Equipment Damage",
+    "environmental": "Environmental Incident",
+    "security": "Security Incident",
+    "fire": "Fire / Emergency"
+  },
+  "MedicalStatus": {
+    "none": "No treatment needed",
+    "first_aid": "First aid only",
+    "medical_treatment": "Medical treatment (non-LTI)",
+    "lti": "Lost Time Injury (LTI)"
+  }
+}