fix: Enable Next.js React Strict Mode

[gowthamrdyy]

Closes #1853

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[github-actions]

GSSoC Label Checklist 🏷️

@Priyanshu-byte-coder — please apply the appropriate labels before merging:

Difficulty (pick one):

• level:beginner — 20 pts
• level:intermediate — 35 pts
• level:advanced — 55 pts
• level:critical — 80 pts

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• quality:exceptional — ×1.5 multiplier

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Points formula: (difficulty × quality_multiplier) + type_bonus

[Copilot]

Pull request overview

Note

Copilot was unable to run its full agentic suite in this review.

Enables React Strict Mode in the Next.js configuration.

Changes:

• Adds reactStrictMode: true to nextConfig.

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