fix(reader): remove Comic Sans test font (system font not available on Linux)

Comic Sans MS is a system font not available on Linux. The cursive
fallback rendered as a script font, giving false negatives. All 8
loaded reading fonts are serif fonts loaded via @font-face, so they
intentionally look similar — font switching is confirmed working.

templates/reader.templ

@@ -259,7 +259,6 @@ templ ReaderSettingsPanel() {
 						<option value="noto-serif">Noto Serif</option>
 						<option value="charis-sil">Charis SIL</option>
 						<option value="ibm-plex">IBM Plex Serif</option>
-						<option value="comic-sans">Comic Sans MS (Test)</option>
 					</select>
 				</label>
 				<label class="block mb-2">