Fix modal close button on samples page

[aaronpowell]

Problem

The modal dialog on the samples page cannot be dismissed — the close button, Escape key, and backdrop click all fail to close it.

Root cause

The samples page (samples.ts) dynamically imports openFileModal to display recipe content, but never calls setupModal(). This function registers all the event handlers for closing the modal (close button click, Escape key, backdrop click). Every other page that uses the modal calls setupModal() during initialization.

Fix

Add the missing setupModal() call to initSamplesPage(), matching the pattern used by all other pages (agents, prompts, instructions, collections, hooks, skills, index).

Testing

Verified with Playwright:

1. Open samples page → click "View Recipe" → modal opens ✅
2. Click close button → modal dismisses, URL hash cleared ✅
3. Open modal → press Escape → modal dismisses ✅

[Copilot]

Pull request overview

This PR fixes a bug where the modal dialog on the samples page could not be dismissed. The root cause was a missing setupModal() call during page initialization, which prevented event handlers for the close button, Escape key, and backdrop click from being registered.

Changes:

• Added setupModal import from ../modal module
• Added setupModal() call in initSamplesPage() to register modal event handlers