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/.bin/why-is-node-running

@@ -0,0 +1,18 @@
+#!/usr/bin/env node
+
+var spawn = require('child_process').spawn
+var path = require('path')
+
+var prog = path.resolve(process.argv[2])
+var progArgs = process.argv.slice(3)
+
+console.log('probing program', prog)
+
+var nodeArgs = [
+  '-r',
+  path.join(__dirname, 'include.js')
+]
+var nodeOpts = { stdio: 'inherit' }
+var child = spawn('node', nodeArgs.concat(prog).concat(progArgs), nodeOpts)
+
+console.log('kill -SIGUSR1', child.pid, 'for logging')