Test(dashboard): handle empty error fallbacks safely

[diksha78dev]

Description

Fixes #4199. Resolves a crash in the dashboard error boundary component when rendering null, undefined, empty, or malformed error objects by ensuring proper fallback checks.

Pillar

• 🎨 Pillar 1 — New Theme Design
• 📐 Pillar 2 — Geometric SVG Improvement
• 🕐 Pillar 3 — Timezone Logic Optimization
• 🛠️ Other (Bug fix, refactoring, docs) - Safeguards/Unit test coverage

Visual Preview

N/A — Logic and testing update only. No visual elements changed.

Checklist before requesting a review:

• I have read the CONTRIBUTING.md file.
• I have tested these changes locally (npx vitest run "app/(root)/dashboard/error.empty-fallback.test.tsx" "app/(root)/dashboard/error.test.tsx").
• 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 updated README.md if I added a new theme or URL parameter. (N/A — no theme or URL parameters added)
• I have starred the repo.
• I have made sure that i have only one commit to merge in this PR.
• The SVG output matches the CommitPulse "premium quality" aesthetic standard (no raw elements, smooth animations, correct fonts). (N/A — no SVG code modified)
• (Recommended) I joined the CommitPulse Discord community for contributor discussions, mentorship, and faster PR support.

[github-actions]

🚨 Hey @diksha78dev, the CI Pipeline is failing on this PR and it has been marked as status:blocked.

Please fix the issues before this can be reviewed. Here's how:

1. Run checks locally before pushing:

npm run format:check   # Check Prettier formatting
npm run lint           # Run ESLint
npm run typecheck      # TypeScript type check
npm run test           # Run unit tests (Vitest)
npm run build          # Verify production build passes

2. Auto-fix common issues:

npm run format         # Auto-fix formatting with Prettier
npm run lint -- --fix  # Auto-fix lint errors where possible

3. Check the full failure log here:
👉 View CI Run

Once you push a fix and the CI passes, the status:blocked label will be removed automatically. 💪

[github-actions]

🎉 Congratulations @diksha78dev! Your PR has been successfully merged. 🚀

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