docs: improve test suite documentation

[man4ish]

Summary

• Adds a file-level JSDoc header and a one-line comment above each it() across the component test suite (11 .test.tsx files), plus a short header on src/test-setup.ts.
• Coverage: 12/12 files documented, 65/65 it() blocks documented, attribution (Developer: Manish Kumar <manish@omnibioai.org>) on 12/12 files.
• This repo is TypeScript/Vitest rather than Python/pytest, so the approach differs from the org's Python test-docstring standard: JSDoc file headers + per-test line comments in place of module/test docstrings, and a TypeScript-compiler-API AST-equivalence check in place of Python's ast module.

Documentation only

• Executable AST differences vs main: 0 across all 12 files, verified with a script using the TypeScript compiler API (ts.createSourceFile) that strips all comments/trivia and compares the structural node stream. Validated first on a throwaway comment-only edit (0 diffs) and a throwaway real code edit (correctly flagged), before trusting it on the actual files.
• No component source, config, or build files changed. Only the 11 test files and test-setup.ts are touched (+138/−0, additions only).

Test plan

• tsc --noEmit: clean before and after
• vitest run: 65/65 passed before and after (identical)
• Boilerplate audit: caught and fixed one duplicate comment (reworded to distinguish Input's field label from StatusDot's status label); 0 duplicates, 0 generic phrases remaining

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