diff --git a/frontend/src/api.js b/frontend/src/api.js
index 42eed59..2e73e34 100644
--- a/frontend/src/api.js
+++ b/frontend/src/api.js
@@ -1,5 +1,5 @@
-async function getJson(url) {
-  const response = await fetch(url);
+async function getJson(url, options) {
+  const response = await fetch(url, options);
   if (!response.ok) {
     throw new Error(`${response.status} ${response.statusText}`);
   }
@@ -33,8 +33,8 @@ export async function fetchEntryDetail(archiveId, entryUid) {
 // Summaries are generated on demand, never at capture time. GET is safe for
 // public sessions (the server applies the same visibility gate as entry detail).
 
-export async function fetchEntrySummary(archiveId, entryUid) {
-  return getJson(`/api/archives/${archiveId}/entries/${entryUid}/summary`);
+export async function fetchEntrySummary(archiveId, entryUid, { signal } = {}) {
+  return getJson(`/api/archives/${archiveId}/entries/${entryUid}/summary`, { signal });
 }
 
 // Kicks off generation. Resolves to either an existing completed summary (200)
@@ -42,13 +42,14 @@ export async function fetchEntrySummary(archiveId, entryUid) {
 // caller polls fetchEntrySummary either way.
 // The server returns 400 with the exact missing env var name when a provider is
 // unconfigured, so its body is surfaced verbatim rather than replaced.
-export async function requestEntrySummary(archiveId, entryUid, { provider, force = false, includeImages = false } = {}) {
+export async function requestEntrySummary(archiveId, entryUid, { provider, force = false, includeImages = false, signal } = {}) {
   const resp = await fetch(
     `/api/archives/${archiveId}/entries/${entryUid}/summary`,
     {
       method: "POST",
       headers: { "Content-Type": "application/json" },
       body: JSON.stringify({ provider, force, include_images: includeImages }),
+      signal,
     }
   );
   if (!resp.ok) {
@@ -63,6 +64,15 @@ export async function requestEntrySummary(archiveId, entryUid, { provider, force
   return resp.json();
 }
 
+// Text artifacts are served by the same entry-artifact endpoint as previews.
+// Keep credentials explicit because this helper is also used by public/private
+// archive views, and preserve the previous concise HTTP error contract.
+export async function fetchArtifactText(src, { signal } = {}) {
+  const response = await fetch(src, { credentials: 'same-origin', signal });
+  if (!response.ok) throw new Error(`HTTP ${response.status}`);
+  return response.text();
+}
+
 export async function fetchEntryChildren(archiveId, entryUid) {
   return getJson(`/api/archives/${archiveId}/entries/${entryUid}/children`);
 }
diff --git a/frontend/src/components/CaptureDialog.jsx b/frontend/src/components/CaptureDialog.jsx
index c4d0111..88a7ee9 100644
--- a/frontend/src/components/CaptureDialog.jsx
+++ b/frontend/src/components/CaptureDialog.jsx
@@ -681,8 +681,10 @@ export default function CaptureDialog({ open, archiveId, onClose, onCaptured, on
     files.forEach(file => {
       const newItem = makeFileItem(file.name)
       setItems(prev => {
-        // Replace a sole empty URL row with the file item; otherwise append
-        if (prev.length === 1 && prev[0].kind !== 'file' && !prev[0].locator.trim()) {
+        // Only a normal URL row can be replaced. Text drafts deliberately use
+        // an empty compatibility locator, but their title/body must survive a
+        // file attachment and remain independently archivable.
+        if (prev.length === 1 && !prev[0].kind && !prev[0].locator.trim()) {
           return [newItem]
         }
         return [...prev, newItem]
diff --git a/frontend/src/components/ContextRail.jsx b/frontend/src/components/ContextRail.jsx
index 1e52aba..6f466d6 100644
--- a/frontend/src/components/ContextRail.jsx
+++ b/frontend/src/components/ContextRail.jsx
@@ -1,4 +1,4 @@
-import { useState, useEffect, useRef } from 'react'
+import { useState, useEffect, useLayoutEffect, useRef } from 'react'
 import { fetchEntryTags, assignTag, removeTag, listEntryCollections, listCollections, addEntryToCollection, updateEntryTitle, deleteEntry, rearchiveEntry, pollCaptureJob, fetchEntrySummary, requestEntrySummary } from '../api'
 import { formatTimestamp, formatBytes, valueText, sourceIconSvg, displayPath } from '../utils'
 
@@ -74,6 +74,9 @@ export default function ContextRail({ archiveId, selectedEntry, selectedUids, se
   })
   const [includeSummaryImages, setIncludeSummaryImages] = useState(false)
   const summaryPollRef = useRef(null)
+  const summaryPollAbortRef = useRef(null)
+  const summaryGenerateAbortRef = useRef(null)
+  const summarySelectionRef = useRef(null)
 
   // ── Bulk-panel state ────────────────────────────────────────────────────
   const isBulk = selectedUids?.size >= 2
@@ -127,14 +130,22 @@ export default function ContextRail({ archiveId, selectedEntry, selectedUids, se
 
   // Seed the summary from the entry detail payload and stop any poll left over
   // from the previously selected entry.
-  useEffect(() => {
+  useLayoutEffect(() => {
+    const selectionKey = archiveId && detail?.summary?.entry_uid
+      ? `${archiveId}:${detail.summary.entry_uid}`
+      : null
+    summarySelectionRef.current = selectionKey
     clearInterval(summaryPollRef.current)
     summaryPollRef.current = null
+    summaryPollAbortRef.current?.abort()
+    summaryPollAbortRef.current = null
+    summaryGenerateAbortRef.current?.abort()
+    summaryGenerateAbortRef.current = null
     setSummary(detail?.latest_summary ?? null)
     setSummaryError('')
     setSummaryBusy(false)
     setIncludeSummaryImages(false)
-  }, [detail?.summary?.entry_uid])
+  }, [archiveId, detail?.summary?.entry_uid])
 
   // Poll only while the latest summary is non-terminal. Anchoring the effect on
   // the status (rather than starting a timer inside the click handler) means a
@@ -146,40 +157,60 @@ export default function ContextRail({ archiveId, selectedEntry, selectedUids, se
     if (summaryStatus !== 'pending' && summaryStatus !== 'running') return
     if (!archiveId || !detail?.summary?.entry_uid) return
     const entryUid = detail.summary.entry_uid
-    summaryPollRef.current = setInterval(async () => {
+    const selectionKey = `${archiveId}:${entryUid}`
+    const controller = new AbortController()
+    summaryPollAbortRef.current = controller
+    const poll = async () => {
       try {
-        const res = await fetchEntrySummary(archiveId, entryUid)
+        const res = await fetchEntrySummary(archiveId, entryUid, { signal: controller.signal })
+        if (controller.signal.aborted || summarySelectionRef.current !== selectionKey) return
         setSummary(res.summary ?? null)
         const st = res.summary?.status
         if (st !== 'pending' && st !== 'running') {
-          clearInterval(summaryPollRef.current)
-          summaryPollRef.current = null
+          clearInterval(intervalId)
+          if (summaryPollRef.current === intervalId) summaryPollRef.current = null
           setSummaryBusy(false)
           if (st === 'completed') onDetailRefresh?.()
         }
-      } catch {
+      } catch (e) {
+        if (controller.signal.aborted || summarySelectionRef.current !== selectionKey) return
         // A transient poll failure is not worth tearing the section down; the
         // next tick retries, and a real failure lands as status === 'failed'.
       }
-    }, SUMMARY_POLL_MS)
+    }
+    const intervalId = setInterval(poll, SUMMARY_POLL_MS)
+    summaryPollRef.current = intervalId
     return () => {
-      clearInterval(summaryPollRef.current)
-      summaryPollRef.current = null
+      clearInterval(intervalId)
+      if (summaryPollRef.current === intervalId) summaryPollRef.current = null
+      controller.abort()
+      if (summaryPollAbortRef.current === controller) summaryPollAbortRef.current = null
     }
   }, [summaryStatus, archiveId, detail?.summary?.entry_uid])
 
-  useEffect(() => () => clearInterval(summaryPollRef.current), [])
+  useEffect(() => () => {
+    clearInterval(summaryPollRef.current)
+    summaryPollAbortRef.current?.abort()
+    summaryGenerateAbortRef.current?.abort()
+  }, [])
 
   async function handleGenerateSummary(force = false) {
     if (!archiveId || !detail?.summary?.entry_uid || summaryBusy) return
+    const entryUid = detail.summary.entry_uid
+    const selectionKey = `${archiveId}:${entryUid}`
+    const controller = new AbortController()
+    summaryGenerateAbortRef.current?.abort()
+    summaryGenerateAbortRef.current = controller
     setSummaryBusy(true)
     setSummaryError('')
     try {
-      const res = await requestEntrySummary(archiveId, detail.summary.entry_uid, {
+      const res = await requestEntrySummary(archiveId, entryUid, {
         provider: summaryProvider,
         force,
         includeImages: includeSummaryImages,
+        signal: controller.signal,
       })
+      if (controller.signal.aborted || summarySelectionRef.current !== selectionKey) return
       if (res.status === 'completed') {
         // 200 cache hit: the response *is* the row, no polling needed.
         setSummary(res)
@@ -191,8 +222,11 @@ export default function ContextRail({ archiveId, selectedEntry, selectedUids, se
         setSummary({ ...(res ?? {}), status: 'pending' })
       }
     } catch (e) {
+      if (controller.signal.aborted || summarySelectionRef.current !== selectionKey) return
       setSummaryError(e.message || 'Summary request failed')
       setSummaryBusy(false)
+    } finally {
+      if (summaryGenerateAbortRef.current === controller) summaryGenerateAbortRef.current = null
     }
   }
 
@@ -402,7 +436,7 @@ export default function ContextRail({ archiveId, selectedEntry, selectedUids, se
   ] : []
 
   const AUDIO_EXTS = new Set(['mp3','ogg','m4a','opus','wav','flac','aac'])
-  const PREVIEW_EXTS = new Set(['mp4','webm','mov','mkv','avi','m4v','ogv','pdf','html','htm','jpg','jpeg','png','gif','webp','avif','svg','bmp'])
+  const PREVIEW_EXTS = new Set(['mp4','webm','mov','mkv','avi','m4v','ogv','pdf','html','htm','md','markdown','txt','jpg','jpeg','png','gif','webp','avif','svg','bmp'])
   const primaryMediaIdx = detail ? detail.artifacts.findIndex(a => a.artifact_role === 'primary_media') : -1
   const primaryMedia = primaryMediaIdx >= 0 ? detail.artifacts[primaryMediaIdx] : null
   const pmExt = primaryMedia ? primaryMedia.relpath.split('.').pop().toLowerCase() : ''
diff --git a/frontend/src/components/TextPreview.jsx b/frontend/src/components/TextPreview.jsx
index 6befaab..ae18418 100644
--- a/frontend/src/components/TextPreview.jsx
+++ b/frontend/src/components/TextPreview.jsx
@@ -1,4 +1,5 @@
 import { useEffect, useState } from 'react'
+import { fetchArtifactText } from '../api'
 
 /**
  * Renders the primary_media artifact of a text/document entry as plain text.
@@ -13,17 +14,15 @@ export default function TextPreview({ src, mime, title }) {
   const [error, setError] = useState(null)
 
   useEffect(() => {
-    let cancelled = false
+    const controller = new AbortController()
     setText(null)
     setError(null)
-    fetch(src, { credentials: 'same-origin' })
-      .then(r => {
-        if (!r.ok) throw new Error(`HTTP ${r.status}`)
-        return r.text()
+    fetchArtifactText(src, { signal: controller.signal })
+      .then(setText)
+      .catch(e => {
+        if (e.name !== 'AbortError') setError(e.message || String(e))
       })
-      .then(t => { if (!cancelled) setText(t) })
-      .catch(e => { if (!cancelled) setError(e.message || String(e)) })
-    return () => { cancelled = true }
+    return () => controller.abort()
   }, [src])
 
   if (error) {