Standardize tooling versions and lock critical dependencies

[rohilsurana]

Summary

• Added pnpm version specification to package.json (packageManager field)
• Added engine constraints to ensure consistency across local and CI environments
• Locked critical packages to exact versions (build tools, TypeScript, linters, etc.)
• Added preview script for local testing with production builds

Changes

• Set pnpm to 9.3.0 (matching CI workflow)
• Set node engine to >=20.6.1
• Removed caret (^) from critical dependencies for version stability
• Added turbo preview task for running production builds locally

[vercel]

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Project	Deployment	Actions	Updated (UTC)
frontier	Ready	Preview, Comment	Mar 5, 2026 10:55am

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[coveralls]

Pull Request Test Coverage Report for Build 22714589385

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 39.873%

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Totals
Change from base Build 22710174172:	0.0%
Covered Lines:	13605
Relevant Lines:	34121

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💛 - Coveralls