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/strip-indent/index.d.ts

@@ -0,0 +1,21 @@
+/**
+Strip leading whitespace from each line in a string.
+
+The line with the least number of leading whitespace, ignoring empty lines, determines the number to remove.
+
+@example
+```
+import stripIndent = require('strip-indent');
+
+const string = '\tunicorn\n\t\tcake';
+//	unicorn
+//		cake
+
+stripIndent(string);
+//unicorn
+//	cake
+```
+*/
+declare function stripIndent(string: string): string;
+
+export = stripIndent;