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/tailwindcss/prettier.config.js

@@ -0,0 +1,19 @@
+module.exports = {
+  // These settings are duplicated in .editorconfig:
+  tabWidth: 2, // indent_size = 2
+  useTabs: false, // indent_style = space
+  endOfLine: 'lf', // end_of_line = lf
+  semi: false, // default: true
+  singleQuote: true, // default: false
+  printWidth: 100, // default: 80
+  trailingComma: 'es5',
+  bracketSpacing: true,
+  overrides: [
+    {
+      files: '*.js',
+      options: {
+        parser: 'flow',
+      },
+    },
+  ],
+}