fix(ui): hide Comic/Manga editor section for non-comics media

The metadata editor's Comic/Manga section (Manga Type, Reading
Direction, Age Rating, Story Arc, Imprint, Scan Info, Metadata
Notes, B&W) rendered for every item — an audiobook showed a manga
dropdown, which is nonsense.

MediaDetail now carries LibraryTypeName (resolved via
GetLibraryType in the /media/:uuid handler) and a
ShowComicMetadata() gate: comics and manga libraries always show the
section; other media only when the scanner recorded comic-style
values (fixed-layout manga-style EPUBs get those scanner defaults
deliberately — when present they stay editable).

templates/book_detail_modals.templ

@@ -543,16 +543,17 @@ templ MetadataEditorModal(book handlers.MediaDetail) {
 							</div>
 						</div>
 					}
-					<div class="rounded-xl border overflow-hidden" style="border-color: var(--border);">
-						<button type="button" class="w-full px-4 py-3 flex justify-between items-center hover:bg-surface-hover"
-							style="color: var(--text-primary);"
-							@click="toggleSection('comic')">
-							<span class="font-semibold">Comic/Manga</span>
-							<span class="inline-flex">
-								<span x-show="openSections.comic">@Icon("chevron-down", "h-4 w-4")</span>
-								<span x-show="!openSections.comic" x-cloak>@Icon("chevron-right", "h-4 w-4")</span>
-							</span>
-						</button>
+					if book.ShowComicMetadata() {
+						<div class="rounded-xl border overflow-hidden" style="border-color: var(--border);">
+							<button type="button" class="w-full px-4 py-3 flex justify-between items-center hover:bg-surface-hover"
+								style="color: var(--text-primary);"
+								@click="toggleSection('comic')">
+								<span class="font-semibold">Comic/Manga</span>
+								<span class="inline-flex">
+									<span x-show="openSections.comic">@Icon("chevron-down", "h-4 w-4")</span>
+									<span x-show="!openSections.comic" x-cloak>@Icon("chevron-right", "h-4 w-4")</span>
+								</span>
+							</button>
 						<div x-show="openSections.comic" x-transition class="p-4 space-y-3 border-t" style="border-color: var(--border);">
 							<div>
 								<label for="manga_type" class="block text-xs font-semibold uppercase tracking-wide mb-1" style="color: var(--text-secondary);">Manga Type</label>
@@ -601,6 +602,7 @@ templ MetadataEditorModal(book handlers.MediaDetail) {
 							</div>
 						</div>
 					</div>
+					}
 					<div class="rounded-xl border overflow-hidden" style="border-color: var(--border);">
 						<button type="button" class="w-full px-4 py-3 flex justify-between items-center hover:bg-surface-hover"
 							style="color: var(--text-primary);"