chore: enable vitest and jsx-a11y lint plugins, add utility scripts

- Enable vitest and jsx-a11y plugins in oxlint config for better test
  and accessibility linting
- Add fmt:check script for CI format verification
- Add cache:clean script for clearing stale vite task cache
- Fix accessibility issues caught by jsx-a11y: replace div[role=button]
  with semantic button elements in PackageCard and Sidebar overlay

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: Boshen

.oxlintrc.json

@@ -3,7 +3,9 @@
     "unicorn",
     "typescript",
     "oxc",
-    "react"
+    "react",
+    "vitest",
+    "jsx-a11y"
   ],
   "jsPlugins": [
     "./plugins/debugger.js"

apps/dashboard/src/components/layout/Sidebar.tsx

@@ -78,9 +78,11 @@ export function Sidebar() {
 
       {/* Mobile Overlay */}
       {mobileOpen && (
-        <div
+        <button
+          type="button"
           className="lg:hidden fixed inset-0 bg-black/40 backdrop-blur-sm z-40"
           onClick={() => setMobileOpen(false)}
+          aria-label="Close menu"
         />
       )}
 

apps/dashboard/src/components/npm/PackageCard.tsx

@@ -154,17 +154,10 @@ export function PackageCard({ packageName }: PackageCardProps) {
   ];
 
   return (
-    <div
-      className="rounded-lg border border-[var(--color-border)] bg-[var(--color-bg-elevated)] transition-all cursor-pointer group hover:border-[var(--color-border-strong)]"
+    <button
+      type="button"
+      className="rounded-lg border border-[var(--color-border)] bg-[var(--color-bg-elevated)] transition-all cursor-pointer group hover:border-[var(--color-border-strong)] text-left w-full"
       onClick={handleClick}
-      onKeyDown={(e) => {
-        if (e.key === "Enter" || e.key === " ") {
-          e.preventDefault();
-          handleClick();
-        }
-      }}
-      role="button"
-      tabIndex={0}
     >
       {/* Header */}
       <div className="px-4 py-3 border-b border-[var(--color-border)] flex items-center justify-between">
@@ -195,6 +188,6 @@ export function PackageCard({ packageName }: PackageCardProps) {
           </div>
         ))}
       </div>
-    </div>
+    </button>
   );
 }

package.json

@@ -12,6 +12,8 @@
     "lint": "vite lint --type-aware --type-check",
     "test": "vite test",
     "fmt": "vite fmt",
+    "fmt:check": "vite fmt --check",
+    "cache:clean": "vite cache clean",
     "generate": "node tools/override-rolldown.mjs --stats"
   },
   "devDependencies": {