chore(deps): install missing shadcn/ui and test dependencies to fix TS build

[ArshVermaGit]

Description

This PR resolves critical TypeScript build failures caused by missing node modules.

Previously, running npm run type-check (which runs in CI and during local builds) threw several TS2307 (Cannot find module) and TS2339 (Property does not exist) errors. These occurred because foundational packages used by the shadcn/ui components (like badge.tsx and button.tsx) and the test suite were not present in package.json.

Resolved Issue

Resolves #1790

Changes Made

• Dependency Installation: Explicitly installed the missing required packages:
  • class-variance-authority (for component variant styling)
  • tailwind-merge & clsx (for dynamic class name utilities in UI components)
  • idb-keyval (required by test/ContributionGraph.test.ts)
• Lockfile Update: Updated package.json and package-lock.json accordingly.

Impact

• Developer Experience (DX) & CI: The local build environment and continuous integration pipelines are restored to a healthy state. Developers will no longer face spurious TypeScript errors when working on UI components.

Testing

• Ran npm run type-check locally.
• Confirmed that all class-variance-authority and tailwind-merge type errors have been completely eliminated (0 errors output).

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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

Quality (optional):

• quality:clean — ×1.2 multiplier
• quality:exceptional — ×1.5 multiplier

Validation (required to score):

• gssoc:approved — counts for points
• gssoc:invalid / gssoc:spam / gssoc:ai-slop — does not score

Type labels (type:*) are auto-detected from files and title. Review and adjust if needed.
Points formula: (difficulty × quality_multiplier) + type_bonus

[ArshVermaGit]

Hi @Priyanshu-byte-coder ! Issue #1790 has been resolved. Please review the PR and merge it under GSSoC. Thanks!