add sectional instruction files for code review

[thostetler]

No description provided.

[Copilot]

Pull request overview

Adds repository-wide and scoped Copilot instruction files to standardize code review focus areas for this Next.js + TypeScript codebase (frontend, API/data, and tests/mocks).

Changes:

• Added repository-wide Copilot review guidance in .github/copilot-instructions.md.
• Added scoped instruction files under .github/instructions/ for frontend, API/data, and testing/mocks.
• Defined applyTo globs so each instruction set targets the relevant parts of the repo.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
.github/copilot-instructions.md	Defines global Copilot review priorities, output style, and project baselines.
.github/instructions/frontend-review.instructions.md	Scoped React/Next.js + Chakra UI review checklist for components/pages/styles.
.github/instructions/api-and-data.instructions.md	Scoped guidance for API/data/middleware, focusing on contracts, state/cache, and security.
.github/instructions/testing-and-mocks.instructions.md	Scoped guidance for test quality plus Vitest/Testing Library and MSW/mocks.

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💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 61.9%. Comparing base (6fde1a2) to head (12c059d).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff            @@
##           master    #816     +/-   ##
========================================
- Coverage    62.0%   61.9%   -0.0%     
========================================
  Files         317     317             
  Lines       36521   36521             
  Branches     1642    1642             
========================================
- Hits        22607   22605      -2     
- Misses      13877   13879      +2     
  Partials       37      37             

see 1 file with indirect coverage changes

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