test: add unit tests for repoAnalytics module

[bhavyanjain3004]

Description

This PR adds comprehensive unit tests for the repoAnalytics module (src/lib/repoAnalytics.ts) to validate the types, structures, and property assertions for RepoAnalyticsResponse and all related sub-interfaces.

Related Issue

Closes #1727

Proposed Changes

• Created a new test file: test/repoAnalytics.test.ts
• Added type validation and structure tests for the following exported interfaces:
  • ExplorerRepoCardData (both complete and minimal forms)
  • RepoContributorData
  • HeatmapPoint
  • RepoHealth
  • LanguageSlice
  • TimelinePoint
  • RepoAnalyticsResponse

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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

[github-actions]

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