Add tests and coverage report, update modules (#18)

Add a comprehensive test suite and coverage output (coverage.json); update pytest.ini and include many new test files under tests/. Update docs components (docs/app/components/ThemeToggle.tsx and docs/app/page.tsx). Modify multiple metbit modules and include regenerated __pycache__ (.pyc) artifacts. Update .gitignore to ignore metbit/__pycache__.

Author: aeiwz

.gitignore

@@ -18,3 +18,7 @@ reports/
 .pytest_cache/
 htmlcov/
 .mypy_cache/
+/metbit/__pycache__
+/metbit/__pycache__
+*.pyc
+*.pyc

coverage.json

@@ -49,6 +49,7 @@ export default function ThemeToggle() {
     <div className="themeToggle" aria-label="Theme">
       <div className="seg" role="group" aria-label="Theme toggle">
         <button
+          type="button"
           className={mode==='light' ? 'active' : ''}
           onClick={() => choose('light')}
           aria-pressed={mode==='light'}
@@ -57,6 +58,7 @@ export default function ThemeToggle() {
           <FiSun aria-hidden /> Light
         </button>
         <button
+          type="button"
           className={mode==='system' ? 'active' : ''}
           onClick={() => choose('system')}
           aria-pressed={mode==='system'}
@@ -65,6 +67,7 @@ export default function ThemeToggle() {
           <FiMonitor aria-hidden /> System
         </button>
         <button
+          type="button"
           className={mode==='dark' ? 'active' : ''}
           onClick={() => choose('dark')}
           aria-pressed={mode==='dark'}

docs/app/components/ThemeToggle.tsx

@@ -13,9 +13,9 @@ export default function HomePage() {
         <h2>Welcome</h2>
         <p>Install from PyPI and jump into processing, modeling, and visualization.</p>
         <p style={{marginTop:12}}>
-          <a className="btn" href="/docs/getting-started"><FiPackage aria-hidden /> Install & Quick Start</a>
+          <Link className="btn" href="/docs/getting-started"><FiPackage aria-hidden /> Install &amp; Quick Start</Link>
           <span style={{ marginLeft: 8 }} />
-          <a className="btn secondary" href="/docs/api">Browse API</a>
+          <Link className="btn secondary" href="/docs/api">Browse API</Link>
         </p>
         <div className="grid">
           <div className="card">