fix: preview video on new tab (#933)

src/components/code-editor/view/CodeEditor.tsx

@@ -1,8 +1,9 @@
 import { EditorView } from '@codemirror/view';
 import { unifiedMergeView } from '@codemirror/merge';
 import type { Extension } from '@codemirror/state';
-import { useMemo, useState } from 'react';
+import { useCallback, useMemo, useState } from 'react';
 import { useTranslation } from 'react-i18next';
+
 import { usePaletteOps } from '../../../contexts/PaletteOpsContext';
 import { useCodeEditorDocument } from '../hooks/useCodeEditorDocument';
 import { useCodeEditorSettings } from '../hooks/useCodeEditorSettings';
@@ -11,11 +12,13 @@ import type { CodeEditorFile } from '../types/types';
 import { createMinimapExtension, createScrollToFirstChunkExtension, getLanguageExtensions } from '../utils/editorExtensions';
 import { getEditorStyles } from '../utils/editorStyles';
 import { createEditorToolbarPanelExtension } from '../utils/editorToolbarPanel';
+
 import CodeEditorFooter from './subcomponents/CodeEditorFooter';
 import CodeEditorHeader from './subcomponents/CodeEditorHeader';
 import CodeEditorLoadingState from './subcomponents/CodeEditorLoadingState';
 import CodeEditorSurface from './subcomponents/CodeEditorSurface';
 import CodeEditorBinaryFile from './subcomponents/CodeEditorBinaryFile';
+import CodeEditorMediaPreview from './subcomponents/CodeEditorMediaPreview';
 
 type CodeEditorProps = {
   file: CodeEditorFile;
@@ -58,6 +61,8 @@ export default function CodeEditor({
     saveSuccess,
     saveError,
     isBinary,
+    previewKind,
+    fileProjectId,
     handleSave,
     handleDownload,
   } = useCodeEditorDocument({
@@ -70,6 +75,29 @@ export default function CodeEditor({
     return extension === 'md' || extension === 'markdown';
   }, [file.name]);
 
+  const isHtmlPreviewFile = useMemo(() => {
+    const extension = file.name.split('.').pop()?.toLowerCase();
+    return extension === 'html' || extension === 'htm';
+  }, [file.name]);
+
+  const openHtmlPreview = useCallback(() => {
+    const previewWindow = window.open('', '_blank');
+    if (!previewWindow) return;
+
+    previewWindow.opener = null;
+    previewWindow.document.title = file.name;
+    previewWindow.document.body.style.margin = '0';
+
+    const iframe = previewWindow.document.createElement('iframe');
+    iframe.title = file.name;
+    iframe.sandbox.add('allow-forms', 'allow-modals', 'allow-popups', 'allow-scripts');
+    iframe.style.cssText = 'position:fixed;inset:0;width:100%;height:100%;border:0;background:white';
+
+    iframe.srcdoc = content;
+
+    previewWindow.document.body.appendChild(iframe);
+  }, [content, file.name]);
+
   const minimapExtension = useMemo(
     () => (
       createMinimapExtension({
@@ -162,6 +190,30 @@ export default function CodeEditor({
     );
   }
 
+  // Natively previewable media (image/pdf/audio/video) is rendered inline
+  // instead of showing the generic "cannot be displayed" placeholder.
+  if (previewKind) {
+    return (
+      <CodeEditorMediaPreview
+        file={file}
+        kind={previewKind}
+        projectId={fileProjectId}
+        isSidebar={isSidebar}
+        isFullscreen={isFullscreen}
+        onClose={onClose}
+        onToggleFullscreen={() => setIsFullscreen((previous) => !previous)}
+        labels={{
+          loading: t('filePreview.loading', 'Loading preview...'),
+          error: t('filePreview.error', 'Unable to display this file.'),
+          openInNewTab: t('filePreview.openInNewTab', 'Open in new tab'),
+          fullscreen: t('actions.fullscreen', 'Fullscreen'),
+          exitFullscreen: t('actions.exitFullscreen', 'Exit fullscreen'),
+          close: t('actions.close', 'Close'),
+        }}
+      />
+    );
+  }
+
   // Binary file display
   if (isBinary) {
     return (
@@ -197,10 +249,12 @@ export default function CodeEditor({
             isSidebar={isSidebar}
             isFullscreen={isFullscreen}
             isMarkdownFile={isMarkdownFile}
+            isHtmlPreviewFile={isHtmlPreviewFile}
             markdownPreview={markdownPreview}
             saving={saving}
             saveSuccess={saveSuccess}
             onToggleMarkdownPreview={() => setMarkdownPreview((previous) => !previous)}
+            onOpenHtmlPreview={openHtmlPreview}
             onOpenSettings={() => paletteOps.openSettings('appearance')}
             onDownload={handleDownload}
             onSave={handleSave}
@@ -210,6 +264,7 @@ export default function CodeEditor({
               showingChanges: t('header.showingChanges'),
               editMarkdown: t('actions.editMarkdown'),
               previewMarkdown: t('actions.previewMarkdown'),
+              previewHtml: t('actions.previewHtml', 'Open HTML preview in new tab'),
               settings: t('toolbar.settings'),
               download: t('actions.download'),
               save: t('actions.save'),