feat(clip): add Parts-format preset to Trim-Clip dialog

The Trim-Clip filename-format radio group only offered three presets
(simple, timestamp, custom template). Users who organise their archive
with the global filename_template_parts pattern (e.g.
08.05.2026_Part07.mp4) had to switch to "custom template" and retype
{date}_Part{part_padded}.mp4 every time.

New "parts" preset:
- index.html: 4th radio option, span#formatParts for the live preview
- types.ts + renderer-globals.d.ts: filenameFormat union extended
- main.ts: makeClipFilename branch produces ${dateStr}_Part${padded}.mp4;
  sanitizeCustomClip whitelists "parts" so persisted queue items with
  the new format survive a restart
- renderer.ts: getSelectedFilenameFormat returns "parts"; live preview
  via partNum.padStart(2, "0")
- DE/EN locales: clips.formatParts label

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

src/index.html

@@ -106,6 +106,11 @@
                         style="width: 18px; height: 18px; accent-color: #9146FF;">
                     <span id="formatTimestamp" style="color: #aaa;">01.02.2026_CLIP_00-00-00_1.mp4 (mit Zeitstempel)</span>
                 </label>
+                <label style="display: flex; align-items: center; gap: 10px; cursor: pointer; margin-bottom: 8px;">
+                    <input type="radio" name="filenameFormat" value="parts" onchange="updateFilenameExamples()"
+                        style="width: 18px; height: 18px; accent-color: #9146FF;">
+                    <span id="formatParts" style="color: #aaa;">01.02.2026_Part01.mp4 (Parts-Format)</span>
+                </label>
                 <label style="display: flex; align-items: center; gap: 10px; cursor: pointer; margin-bottom: 10px;">
                     <input type="radio" name="filenameFormat" value="template" onchange="updateFilenameExamples()"
                         style="width: 18px; height: 18px; accent-color: #9146FF;">

src/main.ts

@@ -364,7 +364,7 @@ function sanitizeCustomClip(raw: unknown): CustomClip | undefined {
     if (!Number.isFinite(startSec) || !Number.isFinite(durationSec) || durationSec <= 0 || !Number.isFinite(startPart)) return undefined;
 
     const filenameFormat = raw.filenameFormat;
-    if (filenameFormat !== 'simple' && filenameFormat !== 'timestamp' && filenameFormat !== 'template') return undefined;
+    if (filenameFormat !== 'simple' && filenameFormat !== 'timestamp' && filenameFormat !== 'template' && filenameFormat !== 'parts') return undefined;
 
     return {
         startSec: Math.max(0, startSec),
@@ -2666,9 +2666,15 @@ async function downloadVOD(
                 const s = Math.floor(startOffset % 60);
                 const timeStr = `${h.toString().padStart(2, '0')}-${m.toString().padStart(2, '0')}-${s.toString().padStart(2, '0')}`;
                 return path.join(folder, `${dateStr}_CLIP_${timeStr}_${partNum}.mp4`);
-            } else {
-                return path.join(folder, `${dateStr}_${partNum}.mp4`);
             }
+
+            if (clip.filenameFormat === 'parts') {
+                // Mirrors the global filename_template_parts default:
+                // `{date}_Part{part_padded}.mp4` -> e.g. 08.05.2026_Part07.mp4
+                return path.join(folder, `${dateStr}_Part${partNum.toString().padStart(2, '0')}.mp4`);
+            }
+
+            return path.join(folder, `${dateStr}_${partNum}.mp4`);
         };
 
         // If clip is longer than part duration, split into parts

src/renderer-globals.d.ts

@@ -34,7 +34,7 @@ interface CustomClip {
     startSec: number;
     durationSec: number;
     startPart: number;
-    filenameFormat: 'simple' | 'timestamp' | 'template';
+    filenameFormat: 'simple' | 'timestamp' | 'template' | 'parts';
     filenameTemplate?: string;
 }
 

src/renderer-locale-de.ts

@@ -189,6 +189,7 @@ const UI_TEXT_DE = {
         unknownError: 'Unbekannter Fehler',
         formatSimple: '(Standard)',
         formatTimestamp: '(mit Zeitstempel)',
+        formatParts: '(Parts-Format)',
         formatTemplate: '(benutzerdefiniert)',
         templateEmpty: 'Das Template darf im benutzerdefinierten Modus nicht leer sein.',
         templatePlaceholder: '{date}_{part}.mp4',

src/renderer-locale-en.ts

@@ -189,6 +189,7 @@ const UI_TEXT_EN = {
         unknownError: 'Unknown error',
         formatSimple: '(default)',
         formatTimestamp: '(with timestamp)',
+        formatParts: '(parts naming)',
         formatTemplate: '(custom template)',
         templateEmpty: 'Template cannot be empty in custom template mode.',
         templatePlaceholder: '{date}_{part}.mp4',

src/renderer.ts

@@ -535,9 +535,12 @@ function formatSecondsWithPattern(totalSeconds: number, pattern: string): string
         .replace(/\\(.)/g, '$1');
 }
 
-function getSelectedFilenameFormat(): 'simple' | 'timestamp' | 'template' {
+function getSelectedFilenameFormat(): 'simple' | 'timestamp' | 'template' | 'parts' {
     const selected = query<HTMLInputElement>('input[name="filenameFormat"]:checked').value;
-    return selected === 'template' ? 'template' : selected === 'timestamp' ? 'timestamp' : 'simple';
+    if (selected === 'template') return 'template';
+    if (selected === 'timestamp') return 'timestamp';
+    if (selected === 'parts') return 'parts';
+    return 'simple';
 }
 
 function updateFilenameTemplateVisibility(): void {
@@ -895,6 +898,7 @@ function updateFilenameExamples(): void {
 
     byId('formatSimple').textContent = `${dateStr}_${partNum}.mp4 ${UI_TEXT.clips.formatSimple}`;
     byId('formatTimestamp').textContent = `${dateStr}_CLIP_${timeStr}_${partNum}.mp4 ${UI_TEXT.clips.formatTimestamp}`;
+    byId('formatParts').textContent = `${dateStr}_Part${partNum.padStart(2, '0')}.mp4 ${UI_TEXT.clips.formatParts}`;
     byId('formatTemplate').textContent = `${buildTemplatePreview(template, {
         title: clipDialogData.title,
         date,

src/types.ts

@@ -2,7 +2,7 @@ export interface CustomClip {
     startSec: number;
     durationSec: number;
     startPart: number;
-    filenameFormat: 'simple' | 'timestamp' | 'template';
+    filenameFormat: 'simple' | 'timestamp' | 'template' | 'parts';
     filenameTemplate?: string;
 }