Fix CI build failures by resolving linting errors

[Copilot]

The build was failing in CI due to linting errors when CI=true is set (standard in CI environments). No Vercel dependencies were present in the project.

Changes

• Accessibility fixes

  • Replaced <a onClick> with <button> in Download.js for keyboard accessibility
  • Changed Navbar home link from href="#" to href="#home"

• React Hooks compliance

  • Removed unused imports (useState, tf) from ProjectsExtended.js
  • Moved runCoco and detect functions inside useEffect to resolve dependency warnings
  • Added cleanup function to clear setInterval on unmount, preventing memory leak

// Before: setInterval without cleanup
useEffect(() => {
  runCoco();  // Causes dependency warning
}, [runCoco]);

// After: proper cleanup
useEffect(() => {
  const runCoco = async () => {
    const intervalId = setInterval(() => detect(net), 10);
    return intervalId;
  };
  
  let intervalId;
  runCoco().then(id => { intervalId = id; });
  
  return () => { if (intervalId) clearInterval(intervalId); };
}, []);

Build now completes successfully with npm run build.

Original prompt

remove vercel dependency and to build without it.

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