fix(templates): use expression attributes and fix indentation

Convert string-interpolation attributes (value="{ x }") to templ
expression attributes (value={ x }) for IDs, paths, and titles, and
fix indentation in header.templ and progress.templ.

templates/collection_rules.templ

@@ -38,7 +38,7 @@ templ CollectionRules(user User, collection CollectionData) {
 				<div class="mb-8">
 					<h2 class="text-2xl font-bold mb-4" style="color: var(--text-primary)">Create New Rule</h2>
 					<form id="rule-form" @submit="handleCreateRule($event)">
-						<input type="hidden" id="collection-id" value="{ collection.ID }"/>
+						<input type="hidden" id="collection-id" value={ collection.ID }/>
 						<div class="grid grid-cols-1 md:grid-cols-2 gap-6 mb-6">
 							<div>
 								<label class="block text-sm font-medium mb-2" style="color: var(--text-secondary)">Field</label>