Update period headers to show explicit date ranges

- "Primeval History (c. 4000 – c. 2100 BC)" instead of "(Creation – c. 2100 BC)"
- "The Patriarchal Period (c. 2100 – c. 1700 BC)" updated end date
- "Egypt and the Exodus (c. 1700 – 1406 BC)" updated to match event dates
- "The Life of Christ (5 BC – AD 30)" removed unnecessary "c." prefix
- Makes chronology clearer by showing actual date ranges throughout

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

kjvstudy_org/data/biblical_timeline.json

@@ -12,7 +12,7 @@
   ],
   "conclusion": "The biblical timeline does not end with the Apostles but extends to Christ's promised return. The church age—spanning now two millennia—represents the 'times of the Gentiles' (Luke 21:24) and the period of gospel proclamation to all nations (Matthew 24:14). Scripture anticipates Christ's second coming in glory to judge the living and dead, the resurrection of believers, the final judgment of the wicked, and the establishment of new heavens and new earth wherein dwelleth righteousness (2 Peter 3:13). Every event recorded in biblical history points forward to this consummation, when God will be 'all in all' (1 Corinthians 15:28) and His redemptive purposes fully realized.",
   "timeline_events": {
-    "Primeval History (Creation – c. 2100 BC)": [
+    "Primeval History (c. 4000 – c. 2100 BC)": [
       {
         "title": "Creation of the World",
         "date": "c. 4000 BC",
@@ -63,7 +63,7 @@
         ]
       }
     ],
-    "The Patriarchal Period (c. 2100 – 1800 BC)": [
+    "The Patriarchal Period (c. 2100 – c. 1700 BC)": [
       {
         "title": "Call of Abraham",
         "date": "c. 2091 BC",
@@ -103,7 +103,7 @@
         ]
       }
     ],
-    "Egypt and the Exodus (c. 1800 – 1400 BC)": [
+    "Egypt and the Exodus (c. 1700 – 1406 BC)": [
       {
         "title": "Israelites in Egyptian Bondage",
         "date": "c. 1706–1446 BC",
@@ -394,7 +394,7 @@
         ]
       }
     ],
-    "The Life of Christ (c. 5 BC – AD 30)": [
+    "The Life of Christ (5 BC – AD 30)": [
       {
         "title": "Birth of Jesus Christ",
         "date": "5–4 BC",