diff --git a/frontend/src/detail/DetailPanel.jsx b/frontend/src/detail/DetailPanel.jsx
index ac86ccf..4b74640 100644
--- a/frontend/src/detail/DetailPanel.jsx
+++ b/frontend/src/detail/DetailPanel.jsx
@@ -13,8 +13,9 @@ import { getTagColorStyle } from '../utils/colors';
 import { formatFileSize } from '../utils/format';
 import { resolveDocumentAssetUrl, createAssetView } from '../asset_manager';
 import { useAssetNavigator } from '../hooks/useAssetNavigator';
+import { describeDocumentSummary } from '../documents/documentSummary';
+import { createDocumentActionState } from '../documents/documentActions';
 import PreviewZoomOverlay from './PreviewZoomOverlay';
-import { openOcrTextInNewTab } from '../utils/ocr';
 
 const MAX_PREVIEW_STACK_ITEMS = 15;
 
@@ -314,14 +315,29 @@ const DetailPanel = ({
     [selectedDocuments],
   );
 
-  const singleDownloadHref = useMemo(() => {
-    if (!singleDoc) return null;
-    const downloadPath = singleDoc.current_version?.download_path;
-    if (!downloadPath || !resolveApiPath) {
-      return null;
+  const { downloadHref: singleDownloadHref, hasOcr: singleHasOcr, openOcr } = useMemo(
+    () =>
+      createDocumentActionState({
+        document: singleDoc,
+        resolveApiPath,
+        ensurePreviewData,
+        ensureAssetUrl,
+        getDocumentAsset,
+      }),
+    [singleDoc, resolveApiPath, ensurePreviewData, ensureAssetUrl, getDocumentAsset],
+  );
+
+  const detailSummary = useMemo(() => describeDocumentSummary(singleDoc), [singleDoc]);
+
+  const headerTitle = useMemo(() => {
+    if (selectedCount === 0) {
+      return 'Document details';
     }
-    return resolveApiPath(downloadPath);
-  }, [singleDoc, resolveApiPath]);
+    if (selectedCount === 1) {
+      return detailSummary.title;
+    }
+    return `${selectedCount} document${selectedCount === 1 ? '' : 's'}`;
+  }, [selectedCount, detailSummary]);
 
   const [titleEditDocId, setTitleEditDocId] = useState(null);
   const [titleDraft, setTitleDraft] = useState('');
@@ -403,27 +419,6 @@ const DetailPanel = ({
     [onPromoteSelection],
   );
 
-  const hasOcrAsset = useMemo(
-    () => Boolean(singleDoc && getDocumentAsset(singleDoc, 'ocr-text')),
-    [singleDoc, getDocumentAsset],
-  );
-
-  const openOcr = useCallback(async () => {
-    if (!singleDoc) {
-      return;
-    }
-    try {
-      await openOcrTextInNewTab({
-        document: singleDoc,
-        ensurePreviewData,
-        getDocumentAsset,
-        ensureAssetUrl,
-      });
-    } catch (error) {
-      /* noop */
-    }
-  }, [singleDoc, ensurePreviewData, getDocumentAsset, ensureAssetUrl]);
-
   const singlePreviewNavigator = useAssetNavigator({
     document: singleDoc,
     assetType: 'preview',
@@ -614,6 +609,90 @@ const DetailPanel = ({
     return segments;
   }, [singleDoc?.folder_id, resolveFolderPath]);
 
+  const folderLabel = detailSummary.folderLabel;
+
+  const folderDisplayNode = useMemo(() => {
+    if (!singleDoc) {
+      return folderLabel || '—';
+    }
+    if (!singleFolderPath?.length) {
+      return folderLabel || '—';
+    }
+    return (
+      <span className="detail-folder-path">
+        {singleFolderPath.map((segment, index) => {
+          const label = segment?.name || '…';
+          const targetId = segment?.id || null;
+          const key = `${targetId || label}-${index}`;
+          const isClickable = Boolean(targetId) && typeof onFolderNavigate === 'function';
+          const href = !isClickable
+            ? null
+            : targetId === 'root'
+              ? '/documents'
+              : `/documents/folder/${targetId}`;
+          return (
+            <React.Fragment key={key}>
+              {index > 0 ? <span className="detail-folder-path__separator">/</span> : null}
+              {isClickable ? (
+                <a
+                  href={href}
+                  className="detail-folder-path__link"
+                  onClick={(event) => {
+                    if (
+                      event.button !== 0 ||
+                      event.metaKey ||
+                      event.ctrlKey ||
+                      event.shiftKey ||
+                      event.altKey
+                    ) {
+                      return;
+                    }
+                    event.preventDefault();
+                    event.stopPropagation();
+                    onFolderNavigate(targetId);
+                  }}
+                >
+                  {label}
+                </a>
+              ) : (
+                <span className="detail-folder-path__segment">{label}</span>
+              )}
+            </React.Fragment>
+          );
+        })}
+      </span>
+    );
+  }, [singleDoc, singleFolderPath, folderLabel, onFolderNavigate]);
+
+  const detailInfoRows = useMemo(() => {
+    if (!singleDoc) {
+      return [];
+    }
+    const allowedKeys = new Set(['uploaded', 'size', 'type', 'issued', 'pages', 'created', 'updated', 'folder']);
+    const rows = detailSummary.summaryRows
+      .filter((row) => {
+        if (!allowedKeys.has(row.key)) {
+          return false;
+        }
+        if (row.key === 'pages') {
+          return Number.isFinite(detailSummary.pageCount);
+        }
+        if (row.key === 'folder') {
+          return Boolean(singleFolderPath?.length);
+        }
+        return true;
+      })
+      .map((row) => (row.key === 'folder' ? { ...row, value: folderDisplayNode } : row));
+
+    rows.push({
+      key: 'original-name',
+      label: 'Original filename',
+      value: singleDoc.original_name || '—',
+    });
+
+    return rows;
+  }, [singleDoc, detailSummary, folderDisplayNode, singleFolderPath]);
+
   const bulkCorrespondents = useMemo(() => {
     if (selectedDocuments.length <= 1) {
       const doc = selectedDocuments[0];
@@ -890,20 +969,7 @@ const DetailPanel = ({
 
     const displayName = singleDoc.title || singleDoc.original_name;
     const isEditingTitle = titleEditDocId === singleDoc.id;
-    const sizeBytes = Number(singleDoc.current_version?.size_bytes) || 0;
-    const sizeLabel = sizeBytes > 0 ? formatFileSize(sizeBytes) : '—';
-    const issuedAt = singleDoc.issued_at
-      ? new Date(singleDoc.issued_at).toLocaleString()
-      : '—';
     const tagsForDoc = Array.isArray(singleDoc.tags) ? singleDoc.tags : [];
-    const pageCountRaw = singleDoc.current_version?.metadata?.page_count;
-    const pageCountValue =
-      typeof pageCountRaw === 'number'
-        ? pageCountRaw
-        : pageCountRaw != null && pageCountRaw !== ''
-        ? Number.parseInt(pageCountRaw, 10)
-        : null;
-    const hasPageCount = Number.isFinite(pageCountValue) && pageCountValue >= 0;
     const metadata =
       singleDoc.metadata && Object.keys(singleDoc.metadata).length > 0 ? singleDoc.metadata : null;
     const effectiveCardinality = singleEffectiveCardinality;
@@ -1014,76 +1080,17 @@ const DetailPanel = ({
         </div>
         {titleError ? <div className="status-inline error">{titleError}</div> : null}
         <div className="meta">
-          <div>
-            <strong>Uploaded:</strong>{' '}
-            {singleDoc.uploaded_at ? new Date(singleDoc.uploaded_at).toLocaleString() : '—'}
-          </div>
-          <div>
-            <strong>Size:</strong>{' '}
-            {sizeLabel}
-          </div>
-          <div>
-            <strong>Type:</strong> {singleDoc.content_type || 'Unknown'}
-          </div>
-          <div>
-            <strong>Issued:</strong> {issuedAt}
-          </div>
-          {hasPageCount ? (
-            <div>
-              <strong>Pages:</strong> {pageCountValue}
-            </div>
-          ) : null}
-          {singleFolderPath?.length ? (
-            <div>
-              <strong>Folder:</strong>{' '}
-              <span className="detail-folder-path">
-                {singleFolderPath.map((segment, index) => {
-                  const label = segment?.name || '…';
-                  const targetId = segment?.id || null;
-                  const key = `${targetId || label}-${index}`;
-                  const isClickable = Boolean(targetId) && typeof onFolderNavigate === 'function';
-                  const href = !isClickable
-                    ? null
-                    : targetId === 'root'
-                    ? '/documents'
-                    : `/documents/folder/${targetId}`;
-                  return (
-                    <React.Fragment key={key}>
-                      {index > 0 ? <span className="detail-folder-path__separator">/</span> : null}
-                      {isClickable ? (
-                        <a
-                          href={href}
-                          className="detail-folder-path__link"
-                          onClick={(event) => {
-                            if (
-                              event.button !== 0 ||
-                              event.metaKey ||
-                              event.ctrlKey ||
-                              event.shiftKey ||
-                              event.altKey
-                            ) {
-                              return;
-                            }
-                            event.preventDefault();
-                            event.stopPropagation();
-                            onFolderNavigate(targetId);
-                          }}
-                        >
-                          {label}
-                        </a>
-                      ) : (
-                        <span className="detail-folder-path__segment">{label}</span>
-                      )}
-                    </React.Fragment>
-                  );
-                })}
-              </span>
-            </div>
-          ) : null}
-          <div>
-            <strong>Original filename:</strong>{' '}
-            {singleDoc.original_name}
-          </div>
+          {detailInfoRows.map((row) => {
+            const rawValue = row.value;
+            const displayValue =
+              rawValue === null || rawValue === undefined || rawValue === '' ? '—' : rawValue;
+            return (
+              <div key={row.key}>
+                <strong>{row.label}:</strong>{' '}
+                {displayValue}
+              </div>
+            );
+          })}
         </div>
         <TagSection
           title="Tags"
@@ -1227,13 +1234,12 @@ const DetailPanel = ({
   };
 
   const isBulkSelection = selectedCount > 1;
-  const showOcrAction = Boolean(singleDoc && hasOcrAsset);
+  const showOcrAction = Boolean(singleDoc && singleHasOcr);
 
   return (
     <>
       <aside className="detail-panel panel">
         <div className="panel-header">
-          <div className="panel-actions">
           <button
             type="button"
             className="icon-button"
@@ -1258,7 +1264,8 @@ const DetailPanel = ({
               <WindowMaximizeIcon />
             </button>
           ) : null}
-          <div className="spacer" />
+          <h3 className="panel-header__title">{headerTitle}</h3>
+          <div className="panel-actions__spacer" />
           {isBulkSelection && onBulkReanalyze ? (
             <button
               type="button"
@@ -1292,7 +1299,7 @@ const DetailPanel = ({
               className="icon-button"
               onClick={(event) => {
                 event.stopPropagation();
-                openOcr();
+                openOcr().catch(() => {});
               }}
               aria-label="View OCR text"
               title="View OCR text"
@@ -1315,7 +1322,6 @@ const DetailPanel = ({
             </button>
           ) : null}
         </div>
-      </div>
       <div className="panel-body">
         {selectedCount <= 1 ? renderSingle() : renderBulk()}
       </div>
diff --git a/frontend/src/documents/documentActions.js b/frontend/src/documents/documentActions.js
new file mode 100644
index 0000000..7852a94
--- /dev/null
+++ b/frontend/src/documents/documentActions.js
@@ -0,0 +1,75 @@
+import { openOcrTextInNewTab } from '../utils/ocr';
+
+const asyncFalse = async () => false;
+
+const resolveDocumentDownloadHref = (document, resolveApiPath) => {
+  if (!document || typeof resolveApiPath !== 'function') {
+    return null;
+  }
+  const downloadPath = document.current_version?.download_path;
+  if (!downloadPath) {
+    return null;
+  }
+  return resolveApiPath(downloadPath);
+};
+
+const hasDocumentOcrAsset = (document, getDocumentAsset) => {
+  if (!document || typeof getDocumentAsset !== 'function') {
+    return false;
+  }
+  return Boolean(getDocumentAsset(document, 'ocr-text'));
+};
+
+export const createDocumentActionState = ({
+  document,
+  resolveApiPath,
+  ensurePreviewData,
+  ensureAssetUrl,
+  getDocumentAsset,
+  notifyApiError,
+  ocrErrorMessage = 'Unable to open OCR text.',
+}) => {
+  if (!document) {
+    return {
+      downloadHref: null,
+      hasOcr: false,
+      openOcr: asyncFalse,
+    };
+  }
+
+  const downloadHref = resolveDocumentDownloadHref(document, resolveApiPath);
+  const hasOcr = hasDocumentOcrAsset(document, getDocumentAsset);
+
+  const openOcr = hasOcr
+    ? async () => {
+        try {
+          const success = await openOcrTextInNewTab({
+            document,
+            ensurePreviewData,
+            getDocumentAsset,
+            ensureAssetUrl,
+          });
+          if (!success && typeof notifyApiError === 'function') {
+            notifyApiError(new Error('OCR text URL unavailable.'), ocrErrorMessage);
+          }
+          return success;
+        } catch (error) {
+          if (typeof notifyApiError === 'function') {
+            notifyApiError(error, ocrErrorMessage);
+          }
+          throw error;
+        }
+      }
+    : asyncFalse;
+
+  return {
+    downloadHref,
+    hasOcr,
+    openOcr,
+  };
+};
+
+export const documentActionsTestExports = {
+  resolveDocumentDownloadHref,
+  hasDocumentOcrAsset,
+};
diff --git a/frontend/src/documents/documentSummary.js b/frontend/src/documents/documentSummary.js
new file mode 100644
index 0000000..6d78181
--- /dev/null
+++ b/frontend/src/documents/documentSummary.js
@@ -0,0 +1,140 @@
+import { formatFileSize } from '../utils/format';
+
+const defaultFormatDateTime = (value) => {
+  if (!value) {
+    return '—';
+  }
+  const date = new Date(value);
+  if (Number.isNaN(date.getTime())) {
+    return '—';
+  }
+  return date.toLocaleString();
+};
+
+const coercePageCount = (metadata) => {
+  const raw = metadata?.page_count;
+  if (typeof raw === 'number') {
+    return Number.isFinite(raw) && raw >= 0 ? raw : null;
+  }
+  if (raw != null && raw !== '') {
+    const parsed = Number.parseInt(raw, 10);
+    if (Number.isFinite(parsed) && parsed >= 0) {
+      return parsed;
+    }
+  }
+  return null;
+};
+
+const sanitizeTags = (tags) => {
+  if (!Array.isArray(tags)) {
+    return [];
+  }
+  return tags
+    .filter((tag) => tag && (tag.label || tag.id))
+    .map((tag) => ({
+      id: tag.id,
+      label: tag.label || '',
+      color: tag.color || null,
+    }));
+};
+
+const sanitizeCorrespondents = (entries) => {
+  if (!Array.isArray(entries)) {
+    return [];
+  }
+  return entries
+    .filter((entry) => entry && (entry.name || entry.id))
+    .map((entry) => ({
+      id: entry.id,
+      name: entry.name || '',
+      count: entry.count,
+    }));
+};
+
+export const describeDocumentSummary = (document, options = {}) => {
+  if (!document) {
+    return {
+      title: '',
+      originalName: '',
+      mimeTypeLabel: '—',
+      sizeLabel: '—',
+      uploadedAtLabel: '—',
+      issuedAtLabel: '—',
+      createdAtLabel: '—',
+      updatedAtLabel: '—',
+      pageCount: null,
+      pageCountLabel: '—',
+      folderLabel: null,
+      tags: [],
+      correspondents: [],
+      tagsSummary: '—',
+      correspondentsSummary: '—',
+      summaryRows: [],
+    };
+  }
+
+  const {
+    formatDateTime = defaultFormatDateTime,
+  } = options;
+
+  const title = document.title || '';
+  const originalName = document.original_name || '';
+  const mimeTypeLabel = document.content_type || 'Unknown';
+
+  const sizeBytes = Number(document.current_version?.size_bytes);
+  const sizeLabel = Number.isFinite(sizeBytes) && sizeBytes > 0 ? formatFileSize(sizeBytes) : '—';
+
+  const metadata = document.current_version?.metadata || null;
+  const pageCount = coercePageCount(metadata);
+  const pageCountLabel = Number.isFinite(pageCount) ? String(pageCount) : '—';
+
+  const uploadedAtLabel = formatDateTime(document.uploaded_at);
+  const issuedAtLabel = formatDateTime(document.issued_at);
+  const createdAtLabel = formatDateTime(document.created_at);
+  const updatedAtLabel = formatDateTime(document.updated_at);
+
+  const folderLabel = document.folder_path || document.folder_name || null;
+
+  const tags = sanitizeTags(document.tags);
+  const correspondents = sanitizeCorrespondents(document.correspondents);
+
+  const tagLabels = tags.map((tag) => tag.label).filter(Boolean);
+  const correspondentLabels = correspondents.map((entry) => entry.name).filter(Boolean);
+
+  const tagsSummary = tagLabels.length ? tagLabels.join(', ') : '—';
+  const correspondentsSummary = correspondentLabels.length
+    ? correspondentLabels.join(', ')
+    : '—';
+
+  const summaryRows = [
+    { key: 'uploaded', label: 'Uploaded', value: uploadedAtLabel },
+    { key: 'size', label: 'Size', value: sizeLabel },
+    { key: 'type', label: 'Type', value: mimeTypeLabel },
+    { key: 'issued', label: 'Issued', value: issuedAtLabel },
+    { key: 'pages', label: 'Pages', value: pageCountLabel },
+    { key: 'created', label: 'Created', value: createdAtLabel },
+    { key: 'updated', label: 'Updated', value: updatedAtLabel },
+    { key: 'folder', label: 'Folder', value: folderLabel || '—' },
+    { key: 'tags', label: 'Tags', value: tagsSummary },
+    { key: 'correspondents', label: 'Correspondents', value: correspondentsSummary },
+  ];
+
+  return {
+    title,
+    originalName,
+    mimeTypeLabel,
+    sizeLabel,
+    uploadedAtLabel,
+    issuedAtLabel,
+    createdAtLabel,
+    updatedAtLabel,
+    pageCount,
+    pageCountLabel,
+    folderLabel,
+    tags,
+    correspondents,
+    tagsSummary,
+    correspondentsSummary,
+    summaryRows,
+  };
+};
diff --git a/frontend/src/index.jsx b/frontend/src/index.jsx
index 80595fe..a931621 100644
--- a/frontend/src/index.jsx
+++ b/frontend/src/index.jsx
@@ -5454,6 +5454,7 @@ const DocumentsRoute = () => {
     previewWorkspaceEntry,
     closeDocumentPreview,
     handleThumbnailRegeneration,
+    ensurePreviewData,
     resolveApiPath,
     ensureAssetUrl,
     getDocumentAsset,
@@ -5543,6 +5544,7 @@ const DocumentsRoute = () => {
       document: previewWorkspaceDocument,
       previewEntry: previewWorkspaceEntry,
       ensureAssetUrl,
+      ensurePreviewData,
       getDocumentAsset,
       resolveApiPath,
       notifyApiError,
@@ -5555,6 +5557,7 @@ const DocumentsRoute = () => {
     previewWorkspaceDocument,
     previewWorkspaceEntry,
     ensureAssetUrl,
+    ensurePreviewData,
     getDocumentAsset,
     resolveApiPath,
     notifyApiError,
@@ -5611,17 +5614,15 @@ const DocumentsRoute = () => {
       <div className={mainContentClass}>
         {header ? (
           <div className="panel-header main-content__header">
-            <div className="panel-actions main-content__actions">
-              {header.leading}
-              <h2 className="main-content__title">
-                {header.title}
-                {header.subtitle ? (
-                  <span className="main-content__subtitle">{header.subtitle}</span>
-                ) : null}
-              </h2>
-              <div className="spacer" />
-              {header.actions}
-            </div>
+            {header.leading}
+            <h2 className="main-content__title">
+              {header.title}
+              {header.subtitle ? (
+                <span className="main-content__subtitle">{header.subtitle}</span>
+              ) : null}
+            </h2>
+            <div className="panel-actions__spacer" />
+            {header.actions}
           </div>
         ) : null}
         <div className={bodyClass}>{surface.content}</div>
diff --git a/frontend/src/preview/PreviewWorkspace.jsx b/frontend/src/preview/PreviewWorkspace.jsx
index 3585cee..b14661b 100644
--- a/frontend/src/preview/PreviewWorkspace.jsx
+++ b/frontend/src/preview/PreviewWorkspace.jsx
@@ -1,7 +1,7 @@
 import React from 'react';
-import { formatFileSize } from '../utils/format';
 import { DownloadIcon, TextScanIcon, AnalyzeIcon, CloseIcon } from '../ui/icons';
-import { openOcrTextInNewTab } from '../utils/ocr';
+import { describeDocumentSummary } from '../documents/documentSummary';
+import { createDocumentActionState } from '../documents/documentActions';
 
 const PreviewWorkspace = ({
   document,
@@ -12,53 +12,43 @@ const PreviewWorkspace = ({
   }
 
   const title = document.title;
-  const mime = document.content_type;
-  const sizeBytes = Number(document.current_version?.size_bytes) || 0;
-  const sizeLabel = sizeBytes > 0 ? formatFileSize(sizeBytes) : null;
+  const summary = describeDocumentSummary(document);
+  const baseSummaryRows = summary.summaryRows.filter((row) => {
+    if (row.key === 'pages') {
+      return Number.isFinite(summary.pageCount);
+    }
+    if (row.key === 'folder') {
+      return Boolean(summary.folderLabel);
+    }
+    return true;
+  });
+  const summaryRows = [
+    ...baseSummaryRows,
+    {
+      key: 'original-name',
+      label: 'Original filename',
+      value: document.original_name || '—',
+    },
+  ];
   const metadata =
     document.metadata && Object.keys(document.metadata).length > 0 ? document.metadata : null;
-  const folderName = document.folder_path || document.folder_name || null;
-  const issuedAt = document.issued_at || null;
-  const createdAt = document.created_at || null;
-  const updatedAt = document.updated_at || null;
-  const tags = Array.isArray(document.tags) ? document.tags : [];
-  const correspondents = Array.isArray(document.correspondents) ? document.correspondents : [];
-
-  const metadataSummary = (() => {
-    const rows = [];
-    if (mime) rows.push(['Type', mime]);
-    if (sizeLabel) rows.push(['Size', sizeLabel]);
-    if (issuedAt) rows.push(['Issued', new Date(issuedAt).toLocaleString()]);
-    if (createdAt) rows.push(['Created', new Date(createdAt).toLocaleString()]);
-    if (updatedAt) rows.push(['Updated', new Date(updatedAt).toLocaleString()]);
-    if (folderName) rows.push(['Folder', folderName]);
-    if (tags.length) {
-      rows.push(['Tags', tags.map((tag) => tag.label).filter(Boolean).join(', ')]);
-    }
-    if (correspondents.length) {
-      rows.push([
-        'Correspondents',
-        correspondents
-          .map((entry) => entry.name)
-          .filter(Boolean)
-          .join(', '),
-      ]);
-    }
-    return rows;
-  })();
 
   return (
     <section className="preview-workspace">
       <aside className="preview-workspace__sidebar">
         <div className="preview-workspace__info">
-          {metadataSummary.length ? (
+          {summaryRows.length ? (
             <dl className="preview-workspace__summary">
-              {metadataSummary.map(([label, value]) => (
-                <div className="preview-workspace__summary-row" key={label}>
-                  <dt>{label}</dt>
-                  <dd>{value || '—'}</dd>
-                </div>
-              ))}
+              {summaryRows.map(({ key, label, value }) => {
+                const displayValue =
+                  value === null || value === undefined || value === '' ? '—' : value;
+                return (
+                  <div className="preview-workspace__summary-row" key={key}>
+                    <dt>{label}</dt>
+                    <dd>{displayValue}</dd>
+                  </div>
+                );
+              })}
             </dl>
           ) : null}
         </div>
@@ -89,6 +79,7 @@ export default PreviewWorkspace;
 export const createPreviewWorkspaceHeaderActions = ({
   document,
   ensureAssetUrl,
+  ensurePreviewData,
   getDocumentAsset,
   resolveApiPath,
   notifyApiError,
@@ -98,27 +89,15 @@ export const createPreviewWorkspaceHeaderActions = ({
     return null;
   }
 
-  const downloadHref = document.current_version?.download_path
-    ? resolveApiPath(document.current_version.download_path)
-    : null;
-
-  const ocrAsset = getDocumentAsset(document, 'ocr-text');
-  const hasOcr = Boolean(ocrAsset);
-
-  const handleOcrClick = async () => {
-    try {
-      const success = await openOcrTextInNewTab({
-        document,
-        getDocumentAsset,
-        ensureAssetUrl,
-      });
-      if (!success) {
-        throw new Error('OCR text URL unavailable.');
-      }
-    } catch (error) {
-      notifyApiError(error, 'Unable to open OCR text.');
-    }
-  };
+  const { downloadHref, hasOcr, openOcr } = createDocumentActionState({
+    document,
+    resolveApiPath,
+    ensurePreviewData,
+    ensureAssetUrl,
+    getDocumentAsset,
+    notifyApiError,
+    ocrErrorMessage: 'Unable to open OCR text.',
+  });
 
   return (
     <>
@@ -138,7 +117,9 @@ export const createPreviewWorkspaceHeaderActions = ({
       <button
         type="button"
         className="icon-button"
-        onClick={handleOcrClick}
+        onClick={() => {
+          openOcr().catch(() => {});
+        }}
         aria-label="View OCR text"
           title="View OCR text"
         >
@@ -162,6 +143,7 @@ export const createPreviewSurface = ({
   document,
   previewEntry,
   ensureAssetUrl,
+  ensurePreviewData,
   getDocumentAsset,
   resolveApiPath,
   notifyApiError,
@@ -174,7 +156,6 @@ export const createPreviewSurface = ({
   }
 
   const title = document.title;
-  const sidebarToggle = renderSidebarToggle ? renderSidebarToggle() : null;
   const closeButton = onClose
     ? (
         <button
@@ -188,7 +169,8 @@ export const createPreviewSurface = ({
         </button>
       )
     : null;
-  const leading = sidebarToggle || closeButton
+  const sidebarToggle = renderSidebarToggle ? renderSidebarToggle() : null;
+  const leading = closeButton || sidebarToggle
     ? (
         <>
           {sidebarToggle}
@@ -203,6 +185,7 @@ export const createPreviewSurface = ({
     actions: createPreviewWorkspaceHeaderActions({
       document,
       ensureAssetUrl,
+      ensurePreviewData,
       getDocumentAsset,
       resolveApiPath,
       notifyApiError,
diff --git a/frontend/src/sidebar/Sidebar.jsx b/frontend/src/sidebar/Sidebar.jsx
index 811d6d2..26ca9f6 100644
--- a/frontend/src/sidebar/Sidebar.jsx
+++ b/frontend/src/sidebar/Sidebar.jsx
@@ -350,90 +350,88 @@ const Sidebar = ({
   return (
     <aside className="sidebar">
       <div className="panel-header sidebar__header">
-        <div className="panel-actions">
+        <button
+          type="button"
+          className={`sidebar__title-button${tenantMenuOpen ? ' is-open' : ''}`}
+          onClick={toggleTenantMenu}
+          aria-haspopup="true"
+          aria-expanded={tenantMenuOpen}
+          ref={tenantButtonRef}
+        >
+          <span className="sidebar__title">
+            Papercrate
+            {tenantName ? <span className="sidebar__tenant"> / {tenantName}</span> : null}
+          </span>
+          <ChevronDownIcon
+            className={`sidebar__title-chevron${tenantMenuOpen ? ' is-open' : ''}`}
+            size={16}
+          />
+        </button>
+        {tenantMenuOpen ? (
+          <div
+            className={`menu${showTenantList ? '' : ' menu--simple'}`}
+            ref={tenantMenuRef}
+            role="menu"
+            aria-label="Account menu"
+          >
+            {showTenantList ? (
+              <>
+                <div className="menu__heading">Switch tenant</div>
+                <div className="menu__list">
+                  {tenants.map((tenant) => {
+                    const tenantId = tenant?.id || null;
+                    const isActive = tenantId === activeTenantId;
+                    const tenantLabel = tenant?.name;
+                    return (
+                      <button
+                        key={tenantId || tenantLabel}
+                        type="button"
+                        className={`menu__item${isActive ? ' active' : ''}`}
+                        onClick={() => handleTenantSelect(tenant)}
+                        role="menuitem"
+                      >
+                        <span className="menu__check-slot">
+                          {isActive ? <CheckIcon size={16} /> : null}
+                        </span>
+                        <span className="menu__label">{tenantLabel}</span>
+                      </button>
+                    );
+                  })}
+                </div>
+              </>
+            ) : null}
+            <div className="menu__footer">
+              <button
+                type="button"
+                className="menu__settings"
+                onClick={handleSettingsFromMenu}
+              >
+                <SettingsIcon size={16} />
+                Settings
+              </button>
+              <button
+                type="button"
+                className="menu__logout"
+                onClick={handleLogoutFromMenu}
+              >
+                <LogoutIcon size={16} />
+                Log out
+              </button>
+            </div>
+          </div>
+        ) : null}
+        <div className="panel-actions__spacer" />
+        {onCollapse ? (
           <button
             type="button"
-            className={`sidebar__title-button${tenantMenuOpen ? ' is-open' : ''}`}
-            onClick={toggleTenantMenu}
-            aria-haspopup="true"
-            aria-expanded={tenantMenuOpen}
-            ref={tenantButtonRef}
+            className="icon-button"
+            onClick={onCollapse}
+            aria-label="Collapse sidebar"
+            title="Collapse sidebar"
           >
-            <span className="sidebar__title">
-              Papercrate
-              {tenantName ? <span className="sidebar__tenant"> / {tenantName}</span> : null}
-            </span>
-            <ChevronDownIcon
-              className={`sidebar__title-chevron${tenantMenuOpen ? ' is-open' : ''}`}
-              size={16}
-            />
+            <ChevronsLeftIcon />
           </button>
-          {tenantMenuOpen ? (
-            <div
-              className={`menu${showTenantList ? '' : ' menu--simple'}`}
-              ref={tenantMenuRef}
-              role="menu"
-              aria-label="Account menu"
-            >
-              {showTenantList ? (
-                <>
-                  <div className="menu__heading">Switch tenant</div>
-                  <div className="menu__list">
-                    {tenants.map((tenant) => {
-                      const tenantId = tenant?.id || null;
-                      const isActive = tenantId === activeTenantId;
-                      const tenantLabel = tenant?.name;
-                      return (
-                        <button
-                          key={tenantId || tenantLabel}
-                          type="button"
-                          className={`menu__item${isActive ? ' active' : ''}`}
-                          onClick={() => handleTenantSelect(tenant)}
-                          role="menuitem"
-                        >
-                          <span className="menu__check-slot">
-                            {isActive ? <CheckIcon size={16} /> : null}
-                          </span>
-                          <span className="menu__label">{tenantLabel}</span>
-                        </button>
-                      );
-                    })}
-                  </div>
-                </>
-              ) : null}
-              <div className="menu__footer">
-                <button
-                  type="button"
-                  className="menu__settings"
-                  onClick={handleSettingsFromMenu}
-                >
-                  <SettingsIcon size={16} />
-                  Settings
-                </button>
-                <button
-                  type="button"
-                  className="menu__logout"
-                  onClick={handleLogoutFromMenu}
-                >
-                  <LogoutIcon size={16} />
-                  Log out
-                </button>
-              </div>
-            </div>
-          ) : null}
-          <div className="spacer" />
-          {onCollapse ? (
-            <button
-              type="button"
-              className="icon-button ghost"
-              onClick={onCollapse}
-              aria-label="Collapse sidebar"
-              title="Collapse sidebar"
-            >
-              <ChevronsLeftIcon />
-            </button>
-          ) : null}
-        </div>
+        ) : null}
       </div>
       <div className="panel-body sidebar__body">
         {status && (
diff --git a/frontend/src/styles.css b/frontend/src/styles.css
index 00218fb..253acff 100644
--- a/frontend/src/styles.css
+++ b/frontend/src/styles.css
@@ -313,9 +313,9 @@ button.danger:hover:not([disabled]) {
   background: transparent;
 }
 
-.panel-actions .icon-button,
-.panel-actions button,
-.panel-actions a.icon-button {
+.panel-header .icon-button,
+.panel-header button,
+.panel-header a.icon-button {
   display: inline-flex;
   align-items: flex-start;
   justify-content: flex-start;
@@ -330,21 +330,21 @@ button.danger:hover:not([disabled]) {
   text-align: left;
 }
 
-.panel-actions .icon-button:hover:not([disabled]),
-.panel-actions button:hover:not([disabled]),
-.panel-actions a.icon-button:hover {
+.panel-header .icon-button:hover:not([disabled]),
+.panel-header button:hover:not([disabled]),
+.panel-header a.icon-button:hover {
   background: var(--sidebar-hover-bg);
   color: var(--fg);
 }
 
-.panel-actions .icon-button.ghost,
-.panel-actions button.icon-button.ghost {
+.panel-header .icon-button.ghost,
+.panel-header button.icon-button.ghost {
   color: var(--muted);
   padding: 0.25rem;
 }
 
-.panel-actions .icon-button.ghost:hover:not([disabled]),
-.panel-actions button.icon-button.ghost:hover:not([disabled]) {
+.panel-header .icon-button.ghost:hover:not([disabled]),
+.panel-header button.icon-button.ghost:hover:not([disabled]) {
   color: var(--fg);
   background: var(--sidebar-hover-bg);
 }
@@ -607,6 +607,8 @@ button.danger:hover:not([disabled]) {
   flex-wrap: wrap;
   align-items: baseline;
   gap: 0.5rem;
+  flex: 1 1 auto;
+  min-width: 0;
 }
 
 .main-content__subtitle {
@@ -623,9 +625,9 @@ button.danger:hover:not([disabled]) {
   grid-template-columns: auto minmax(0, 1fr);
 }
 
-.sidebar .panel-actions .icon,
-.main-content__header .panel-actions .icon,
-.detail-panel .panel-actions .icon {
+.sidebar .panel-header .icon,
+.main-content__header .icon,
+.detail-panel .panel-header .icon {
   width: 1.35rem;
   height: 1.35rem;
 }
@@ -2207,18 +2209,35 @@ button.danger:hover:not([disabled]) {
 .panel-header {
   display: flex;
   align-items: center;
-  justify-content: flex-start;
-  gap: 0.5rem;
+  justify-content: space-between;
+  gap: 0.75rem;
   padding: 0.5rem;
 }
 
+.panel-header__title {
+  margin: 0;
+  font-size: 1rem;
+  font-weight: 600;
+  line-height: 1.2;
+  white-space: nowrap;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  flex: 1 1 auto;
+  min-width: 0;
+}
+
 .panel-body {
   padding: 0.5rem 1rem;
 }
 
 .panel-actions {
   display: flex;
+  align-items: center;
   gap: 0.5rem;
+  flex: 1 1 auto;
+}
+
+.panel-actions__spacer {
   flex-grow: 1;
 }
 
@@ -2227,10 +2246,6 @@ button.danger:hover:not([disabled]) {
   padding-left: 0.5rem;
 }
 
-.panel-actions .spacer {
-  flex-grow: 1;
-}
-
 .detail-panel .panel-body {
   flex: 1;
   display: flex;