diff --git a/docs/CODE_STRUCTURE.md b/docs/CODE_STRUCTURE.md
index e4bb5a0..e65df20 100644
--- a/docs/CODE_STRUCTURE.md
+++ b/docs/CODE_STRUCTURE.md
@@ -31,8 +31,8 @@ A line-by-line map of the main application file and key functions.
 | ~3840–4030 | Save/load | `save`, `load`, `setFromHash`, URL updates |
 | ~4030–4125 | Theme | Light/dark toggle, URL param, system preference |
 | ~4125–4685 | Version history | `pushLocalVersion`, `versionUndo`, `versionRedo`, `enterPreview`, `exitPreview` |
-| ~4685–4760 | UI helpers | `setSaveStatus`, `notify`, `updateQR` |
-| ~4588–4727 | Export | `downloadTXT`, `downloadHTML`, `downloadMD` |
+| ~4685–4756 | UI helpers | `setSaveStatus`, `notify`, `updateQR` |
+| ~4756–4940 | Export | `downloadTXT`, `downloadHTML`, `downloadMD` |
 | ~4727–5100 | Initialization | DOM ready, hash load, event listeners, Editor setup |
 
 ## Key Functions
diff --git a/index.html b/index.html
index d3b3218..aba6a9a 100644
--- a/index.html
+++ b/index.html
@@ -5110,6 +5110,21 @@ <h4 id="size-tooltip-title">Document is getting large</h4>
       document.getElementById('editor-wrap')?.classList.remove('encrypted-mode')
       updateLockButtonVisibility()
       document.getElementById('unlock-password').value = ''
+      renderAllBlocks()
+
+      if (previewHash) {
+        const wrap = document.getElementById('editor-wrap')
+        const text = document.getElementById('preview-banner-text')
+        if (wrap) wrap.classList.add('preview-mode')
+        if (text) text.textContent = 'Previewing ' + formatVersionLabel(previewHash)
+        updateTitle()
+        updateQR()
+        updateStatusBar()
+        renderHistoryGraph()
+        notify('Unlocked preview')
+        return
+      }
+
       const prevHead = getHeadHash()
       const hash = '#' + await getShortestHash(blocks)
       history.replaceState({}, '', buildUrl(hash))
@@ -5119,7 +5134,6 @@ <h4 id="size-tooltip-title">Document is getting large</h4>
         pushLocalVersion(hash, prevHead ? [prevHead] : (getLocalVersions()[0]?.hash ? [getLocalVersions()[0].hash] : []))
         localStorage.setItem('hash', hash)
       } catch (e) {}
-      renderAllBlocks()
       updateTitle()
       updateQR()
       updateStatusBar()