test(GrowthTrendChart-empty-fallback): verify Edge Cases & Empty/Missing Inputs Verification (Variation 1)

[Thacker-Meet]

Description

Fixes #2543

Added empty and missing input test coverage for GrowthTrendChart.

Pillar

• 🛠️ Other (Bug fix, refactoring, docs)

Visual Preview

• N/A (test-only change)

Checklist before requesting a review:

• I have read the CONTRIBUTING.md file.
• I have run npm run format and npm run lint locally and resolved all errors (CI will fail otherwise).
• My commits follow the Conventional Commits format (e.g., feat(themes): ..., fix(calculate): ...).
• I have starred the repo.
• I have made sure that I have only one commit to merge in this PR.

Changes Made

• Created components/dashboard/GrowthTrendChart.empty-fallback.test.tsx
• Added coverage for empty activity arrays
• Verified chart renders safely with missing contribution data
• Verified timeline markers render correctly in fallback state
• Verified key SVG structures remain available in empty layouts
• Verified labels and timeline sections remain visible with empty inputs

Result

• Improves resilience coverage for GrowthTrendChart
• Verifies empty and missing data scenarios render safely
• Helps prevent regressions when contribution datasets are unavailable
• Confirms chart structure remains stable in fallback states
• All newly added tests pass successfully