feat: Implement Gmail OAuth flow with token management and message re… #254
+151
−38
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🧩 Issue Reference
Related Issue: #235
🛠️ What Did You Implement?
Feature implementation
API / backend logic
UI changes
Refactor / cleanup
Documentation update
Demo / setup task
📁 Workspace Confirmation (MANDATORY)
All changes are inside
contributors/gaurav9479/
Base client/ and/or server/ files were copied from the main directory
No files outside my personal workspace were modified
🧪 Testing Performed
Backend server runs locally without errors
APIs tested with valid inputs
APIs tested with invalid / edge-case inputs
Token refresh flow tested
No console logs of sensitive data