refactor: Convert template event handlers to Alpine.js

Converted all inline onclick/onsubmit handlers to Alpine.js @click/@submit directives and added x-data attributes to template body tags.

Templates updated:
- admin.templ: Added x-data="admin", converted scan/hide buttons
- analytics.templ: Added x-data, converted loadAnalytics button
- api_explorer.templ: Added x-data for API explorer page
- bookshelf.templ: Added x-data, converted library/pagination handlers
- collection_modal.templ: Added x-data for modal components
- collection_rules.templ: Added x-data, converted all rule handlers
- collections.templ: Added x-data, converted navigation/book handlers
- conflicts.templ: Added x-data, converted resolve/dismiss handlers
- header.templ: Converted theme dropdown and user menu handlers
- index.templ: Added x-data for theme/auth
- login.templ: Added x-data for theme switching
- profile.templ: Added x-data, converted delete account
- profile_form.templ: Converted modal close handler
- profile_modal.templ: Added x-data for modal
- progress.templ: Removed script (uses header.logout)
- queue.templ: Added x-data, converted queue handlers
- register.templ: Added x-data for theme
- restore_system_collection_modal.templ: Added x-data
- toast.templ: Converted to x-init with Alpine
- unlinked_books.templ: Added x-data for bulk operations

Dynamic content in devices.templ uses event delegation via data attributes.

templates/profile_form.templ

@@ -154,7 +154,7 @@ templ ProfileForm(user User, actionURL string, requireCurrentPassword bool, show
 		<div class="flex justify-end gap-3 pt-6 border-t" style="border-color: var(--border);">
 			if showCancelButton {
 				<button type="button"
-						onclick="closeProfileModal()"
+						@click="closeProfileModal()"
 						class="px-4 py-2 rounded"
 						style="background-color: var(--bg-primary); color: var(--text-primary); border: 1px solid var(--border);">
 					Cancel