⚡ Consolidate User Profile Fetching

[Adamugy]

⚡ Performance Optimization: Consolidate User Profile Fetching

💡 What:

Consolidated two redundant useEffect hooks in src/App.tsx that both fetched user profile data from /api/auth/me. The merged logic now handles both the initial full profile fetch (when the user ID changes) and lighter synchronization from the local auth context (when the user ID remains the same).

🎯 Why:

The previous implementation resulted in redundant network requests on every app load and whenever the user object changed. Specifically:

1. AuthProvider fetched /api/auth/me on mount.
2. AppContent had two separate useEffect hooks that both fetched /api/auth/me again.
   This caused unnecessary load on the server and slowed down the initial application state synchronization.

📊 Measured Improvement:

• Baseline: 3 calls to /api/auth/me during initial render.
• After Optimization: 2 calls to /api/auth/me.
• Improvement: 33% reduction in initial profile-related network requests.
• Safety: The lastSyncedUserIdRef pattern ensures that we only perform a full fetch when necessary, while still keeping the local state in sync with updates from the authentication context.
• Type Safety: Updated PlanTier in src/types.ts to include missing tiers (researcher, lab) used in the application logic.

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PR created automatically by Jules for task 6974672999587511152 started by @Adamugy

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