feat(templates): add collection modals for create/edit/restore

Add two new template components:

1. CollectionModal(collection CollectionData)
   - Reusable modal for both creating and editing collections
   - When collection.ID is empty: shows "Create Collection" form
   - When collection.ID is set: shows "Edit Collection" form with pre-filled data
   - Features:
     * Name and description fields
     * Icon picker with search input and emoji grid
       (grid populated dynamically by JavaScript)
       (supports typing emoji directly or searching by keywords)
     * Color selection buttons (blue/red/yellow/green/purple)
     * HTMX form submission (hx-post for create, hx-put for update)
     - HX-Redirect to /collections after successful submission

2. RestoreSystemCollectionModal()
   - Modal for restoring deleted system collections
   - Dropdown with options: Continue Reading, Recently Added,
     Recently Read, Not Started
   - HTMX form submission to /api/dashboard/restore-system-collection
   - HX-Redirect to /collections after restoration

Both modals:
- Use fixed inset-0 positioning with black/70 backdrop
- Inherit theme from parent page (no html/head/body tags)
- Include close button (✕) that calls closeCollectionModal()
- Follow existing card styling conventions
- Use CSS custom properties for theming (--bg-secondary, --text-primary, etc.)

templates/collection_modal.templ

@@ -0,0 +1,151 @@
+package templates
+
+templ CollectionModal(collection CollectionData) {
+	<div class="fixed inset-0 z-50 flex items-center justify-center bg-black/70">
+		<div class="card rounded-lg p-6 w-full max-w-md mx-4" style="background-color: var(--bg-secondary); border-color: var(--border);">
+			<div class="flex justify-between items-center mb-6">
+				if collection.ID != "" {
+					<h2 class="text-xl font-bold" style="color: var(--text-primary)">Edit Collection</h2>
+				} else {
+					<h2 class="text-xl font-bold" style="color: var(--text-primary)">Create Collection</h2>
+				}
+				<button type="button" onclick="closeCollectionModal()" class="p-2 hover:opacity-80 rounded" style="color: var(--text-primary)">✕</button>
+			</div>
+			if collection.ID != "" {
+				<form
+					hx-put={ "/api/collections/" + collection.ID }
+					hx-redirect="/collections"
+				>
+					<input type="hidden" name="id" value={ collection.ID }/>
+					<div class="mb-4">
+						<label class="block text-sm font-medium mb-2" style="color: var(--text-secondary)">Name</label>
+						<input
+							type="text"
+							name="name"
+							value={ collection.Name }
+							required
+							class="w-full px-4 py-2 border rounded-lg"
+							style="background-color: var(--bg-primary); color: var(--text-primary); border-color: var(--border);"
+							placeholder="My Reading List"
+						/>
+					</div>
+					<div class="mb-4">
+						<label class="block text-sm font-medium mb-2" style="color: var(--text-secondary)">Description</label>
+						<textarea
+							name="description"
+							class="w-full px-4 py-2 border rounded-lg"
+							style="background-color: var(--bg-primary); color: var(--text-primary); border-color: var(--border);"
+							placeholder="Optional description"
+							rows="3"
+						>{ collection.Description }</textarea>
+					</div>
+					<div class="mb-4">
+						<label class="block text-sm font-medium mb-2" style="color: var(--text-secondary)">Icon</label>
+						<!-- Search/Text Input -->
+						<input
+							type="text"
+							id="icon-search"
+							class="w-full px-4 py-2 border rounded-lg mb-2"
+							style="background-color: var(--bg-primary); color: var(--text-primary); border-color: var(--border);"
+							placeholder="🔍 Search or type emoji..."
+							maxlength="4"
+							oninput="filterIcons(this.value)"
+							onfocus="showAllIcons()"
+						/>
+						<!-- Hidden input for form submission -->
+						<input type="hidden" name="icon" id="collection-icon" value={ collection.Icon }/>
+						<!-- Emoji Grid -->
+						<div
+							id="icon-grid"
+							class="grid grid-cols-8 gap-1 max-h-32 overflow-y-auto p-2 border rounded-lg"
+							style="background-color: var(--bg-primary); border-color: var(--border);"
+						>
+							<!-- Populated dynamically by JavaScript -->
+						</div>
+					</div>
+					<div class="mb-6">
+						<label class="block text-sm font-medium mb-2" style="color: var(--text-secondary)">Color</label>
+						<div class="flex gap-2">
+							<button type="button" onclick="selectColor('blue')" class="w-8 h-8 rounded-full color-option bg-blue-500"></button>
+							<button type="button" onclick="selectColor('red')" class="w-8 h-8 rounded-full color-option bg-red-500"></button>
+							<button type="button" onclick="selectColor('yellow')" class="w-8 h-8 rounded-full color-option bg-yellow-500"></button>
+							<button type="button" onclick="selectColor('green')" class="w-8 h-8 rounded-full color-option bg-green-500"></button>
+							<button type="button" onclick="selectColor('purple')" class="w-8 h-8 rounded-full color-option bg-purple-500"></button>
+						</div>
+						<input type="hidden" name="color" id="collection-color" value={ collection.Color }/>
+					</div>
+					<div class="flex justify-end space-x-3">
+						<button type="button" onclick="closeCollectionModal()" class="btn-secondary px-4 py-2 rounded-lg">Cancel</button>
+						<button type="submit" class="btn-primary px-4 py-2 rounded-lg">Update Collection</button>
+					</div>
+				</form>
+			} else {
+				<form
+					hx-post="/api/collections"
+					hx-redirect="/collections"
+				>
+					<div class="mb-4">
+						<label class="block text-sm font-medium mb-2" style="color: var(--text-secondary)">Name</label>
+						<input
+							type="text"
+							name="name"
+							required
+							class="w-full px-4 py-2 border rounded-lg"
+							style="background-color: var(--bg-primary); color: var(--text-primary); border-color: var(--border);"
+							placeholder="My Reading List"
+						/>
+					</div>
+					<div class="mb-4">
+						<label class="block text-sm font-medium mb-2" style="color: var(--text-secondary)">Description</label>
+						<textarea
+							name="description"
+							class="w-full px-4 py-2 border rounded-lg"
+							style="background-color: var(--bg-primary); color: var(--text-primary); border-color: var(--border);"
+							placeholder="Optional description"
+							rows="3"
+						></textarea>
+					</div>
+					<div class="mb-4">
+						<label class="block text-sm font-medium mb-2" style="color: var(--text-secondary)">Icon</label>
+						<!-- Search/Text Input -->
+						<input
+							type="text"
+							id="icon-search"
+							class="w-full px-4 py-2 border rounded-lg mb-2"
+							style="background-color: var(--bg-primary); color: var(--text-primary); border-color: var(--border);"
+							placeholder="🔍 Search or type emoji..."
+							maxlength="4"
+							oninput="filterIcons(this.value)"
+							onfocus="showAllIcons()"
+						/>
+						<!-- Hidden input for form submission -->
+						<input type="hidden" name="icon" id="collection-icon" value={ collection.Icon }/>
+						<!-- Emoji Grid -->
+						<div
+							id="icon-grid"
+							class="grid grid-cols-8 gap-1 max-h-32 overflow-y-auto p-2 border rounded-lg"
+							style="background-color: var(--bg-primary); border-color: var(--border);"
+						>
+							<!-- Populated dynamically by JavaScript -->
+						</div>
+					</div>
+					<div class="mb-6">
+						<label class="block text-sm font-medium mb-2" style="color: var(--text-secondary)">Color</label>
+						<div class="flex gap-2">
+							<button type="button" onclick="selectColor('blue')" class="w-8 h-8 rounded-full color-option bg-blue-500"></button>
+							<button type="button" onclick="selectColor('red')" class="w-8 h-8 rounded-full color-option bg-red-500"></button>
+							<button type="button" onclick="selectColor('yellow')" class="w-8 h-8 rounded-full color-option bg-yellow-500"></button>
+							<button type="button" onclick="selectColor('green')" class="w-8 h-8 rounded-full color-option bg-green-500"></button>
+							<button type="button" onclick="selectColor('purple')" class="w-8 h-8 rounded-full color-option bg-purple-500"></button>
+						</div>
+						<input type="hidden" name="color" id="collection-color" value="blue"/>
+					</div>
+					<div class="flex justify-end space-x-3">
+						<button type="button" onclick="closeCollectionModal()" class="btn-secondary px-4 py-2 rounded-lg">Cancel</button>
+						<button type="submit" class="btn-primary px-4 py-2 rounded-lg">Create Collection</button>
+					</div>
+				</form>
+			}
+		</div>
+	</div>
+}

templates/restore_system_collection_modal.templ

@@ -0,0 +1,31 @@
+package templates
+
+templ RestoreSystemCollectionModal() {
+	<div class="fixed inset-0 z-50 flex items-center justify-center bg-black/70">
+		<div class="card rounded-lg p-6 w-full max-w-md mx-4" style="background-color: var(--bg-secondary); border-color: var(--border);">
+			<div class="flex justify-between items-center mb-6">
+				<h2 class="text-xl font-bold" style="color: var(--text-primary)">Restore System Collection</h2>
+				<button type="button" onclick="closeCollectionModal()" class="p-2 hover:opacity-80 rounded" style="color: var(--text-primary)">✕</button>
+			</div>
+			<div class="mb-4">
+				<p class="mb-4" style="color: var(--text-secondary)">Select a system collection to restore:</p>
+				<form
+					hx-post="/api/dashboard/restore-system-collection"
+					hx-redirect="/collections"
+				>
+					<select name="collection_name" class="w-full px-4 py-2 border rounded-lg" style="background-color: var(--bg-primary); color: var(--text-primary); border-color: var(--border);">
+						<option value="">Select collection...</option>
+						<option value="continue-reading">Continue Reading</option>
+						<option value="recently-added">Recently Added</option>
+						<option value="recently-read">Recently Read</option>
+						<option value="not-started">Not Started</option>
+					</select>
+					<div class="flex justify-end space-x-3 mt-6">
+						<button type="button" onclick="closeCollectionModal()" class="btn-secondary px-4 py-2 rounded-lg">Cancel</button>
+						<button type="submit" class="btn-primary px-4 py-2 rounded-lg">Restore</button>
+					</div>
+				</form>
+			</div>
+		</div>
+	</div>
+}