cleanup: .clip-template-wrap.shown modifier — kills inline display:none + style.display toggle

The clip-cutter modal's custom-template wrap (.clip-template-wrap) was hidden by default via inline style="display:none;" in HTML and shown/hidden by updateFilenameTemplateVisibility() via wrap.style.display = 'block' / 'none' based on the selected filename format.

Moved both into CSS: the base rule now sets display:none, and a .shown modifier flips to display:block. The renderer toggles the class via classList.toggle('shown', ...) instead of poking at .style.display, and the HTML drops its inline style attribute.

Same pattern as 4.6.126 (.queue-details.expanded). Two inline style references gone.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/index.html

@@ -99,7 +99,7 @@
                     <span id="formatTemplate" class="clip-radio-label">{date}_{part}.mp4 (benutzerdefiniert)</span>
                 </label>
 
-                <div id="clipFilenameTemplateWrap" class="clip-template-wrap" style="display:none;">
+                <div id="clipFilenameTemplateWrap" class="clip-template-wrap">
                     <input type="text" id="clipFilenameTemplate" value="{date}_{part}.mp4" placeholder="{date}_{part}.mp4" class="clip-modal-template-input" oninput="updateFilenameExamples()">
                     <div id="clipTemplateHelp" class="clip-modal-hint">Platzhalter: {title} {id} {channel} {date} {part} {trim_start} {trim_end} {trim_length} {date_custom="yyyy-MM-dd"}</div>
                     <div id="clipTemplateLint" class="template-lint ok">Template-Check: OK</div>