feat: redesign Exams List page to show submitted custom exams

- Added Custom Exams tab showing all exams from Generation page
- Displays title, module badges, duration, and status
- Added Create Exam button
- Kept Exam Sessions tab for institutional sessions
- Search filters across exams

Made-with: Cursor

node_modules/react-style-singleton/README.md

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+react-style-singleton
+====
+
+__300b__ with all dependencies, minified and gzipped
+
+
+Creates a style component with internal _tracker_.
+- Adds styles to the browser on the __first__ instance mount.
+- Removes after the __last__ instance unmount.
+- Thus helps you deliver styles you need to the customer, and clean up later.
+- Is not server-side rendering compatible!
+
+
+# API
+
+## Component
+
+```js
+import {styleSingleton} from 'react-style-singleton'
+
+const Style = styleSingleton();
+
+export const App = () => (
+  <Style styles={'body {color:red}'} />
+);
+```
+
+## Hook
+
+```js
+import {styleHookSingleton} from 'react-style-singleton';
+
+const useStyle = styleHookSingleton();
+const useAnotherStyle = styleHookSingleton();
+
+export const App = () => {
+  useStyle('div {color:red}');
+  useAnotherStyle('body { background-color:red }');
+  return (<div />);
+}
+```
+
+# License
+
+MIT