diff --git a/docs/sw.js b/docs/sw.js
index 1efa785..06c1d0a 100644
--- a/docs/sw.js
+++ b/docs/sw.js
@@ -1,17 +1,64 @@
+importScripts("https://cdn.jsdelivr.net/npm/localforage@1.10.0/dist/localforage.min.js");
 const TARGET_SUBSTRING = "openrouter.ai/api/v1/chat/completions";
-const STATE_TTL_MS = 24 * 60 * 60 * 1e3;
-const state = {
-  totalIntercepted: 0,
-  activeStreams: {},
-  // streamId -> { url, startedAt, bytes, lastProgressAt, status }
-  lastStreamSummary: null
-  // summary of last finished stream
-};
+const THREADS_KEY = "threads_v1";
+const SAVE_BYTES_THRESHOLD = 8 * 1024;
+const SAVE_TIME_THRESHOLD = 1e3;
+const BROADCAST_THROTTLE_MS = 700;
 const gid = () => Math.random().toString(36).slice(2, 9) + "-" + Date.now().toString(36);
+const now = () => Date.now();
+async function readThreads() {
+  try {
+    const v = await localforage.getItem(THREADS_KEY);
+    return Array.isArray(v) ? v : [];
+  } catch (e) {
+    console.error("sw: readThreads error", e);
+    return [];
+  }
+}
+async function writeThreads(arr) {
+  try {
+    await localforage.setItem(THREADS_KEY, arr);
+  } catch (e) {
+    console.error("sw: writeThreads error", e);
+    throw e;
+  }
+}
+function pickLastThread(threads) {
+  if (!threads || threads.length === 0) return null;
+  let sorted = [...threads].sort((a, b) => (b.updatedAt || 0) - (a.updatedAt || 0));
+  return sorted[0];
+}
+function upsertAssistantInThreadObj(threadObj, streamId, text) {
+  threadObj.updatedAt = now();
+  for (let i = threadObj.messages.length - 1; i >= 0; i--) {
+    const m = threadObj.messages[i];
+    if (m && m.sw_streamId === streamId) {
+      m.content = text;
+      m.contentParts = [{ type: "text", text }];
+      m.updatedAt = now();
+      m._sw_savedAt = now();
+      return threadObj;
+    }
+  }
+  const msg = {
+    id: "swmsg-" + gid(),
+    role: "assistant",
+    content: text,
+    contentParts: [{ type: "text", text }],
+    kind: "assistant",
+    sw_saved: true,
+    sw_streamId: streamId,
+    createdAt: now(),
+    updatedAt: now(),
+    _sw_savedAt: now()
+  };
+  threadObj.messages.push(msg);
+  return threadObj;
+}
 async function broadcast(msg) {
   try {
-    const clientsList = await self.clients.matchAll({ includeUncontrolled: true, type: "window" });
-    for (const c of clientsList) {
+    const cl = await self.clients.matchAll({ includeUncontrolled: true, type: "window" });
+    for (const c of cl) {
       try {
         c.postMessage(msg);
       } catch (e) {
@@ -20,20 +67,14 @@ async function broadcast(msg) {
   } catch (e) {
   }
 }
-function cleanupState() {
-  const now = Date.now();
-  for (const k of Object.keys(state.activeStreams)) {
-    if (now - (state.activeStreams[k].lastProgressAt || state.activeStreams[k].startedAt) > STATE_TTL_MS) {
-      delete state.activeStreams[k];
-    }
-  }
-}
-self.addEventListener("install", (e) => {
-  self.skipWaiting();
-});
-self.addEventListener("activate", (e) => {
-  e.waitUntil(self.clients.claim());
-});
+self.addEventListener("install", (e) => self.skipWaiting());
+self.addEventListener("activate", (e) => e.waitUntil(self.clients.claim()));
+const state = {
+  totalIntercepted: 0,
+  activeStreams: {},
+  // streamId => meta
+  lastStream: null
+};
 self.addEventListener("fetch", (event) => {
   try {
     const url = String(event.request.url || "");
@@ -42,60 +83,85 @@ self.addEventListener("fetch", (event) => {
       const upstream = await fetch(event.request);
       if (!upstream || !upstream.body) return upstream;
       const streamId = "sw-" + gid();
-      const meta = { url, startedAt: Date.now(), bytes: 0, lastProgressAt: Date.now(), status: "started" };
+      const meta = { url, startedAt: now(), bytes: 0, status: "started" };
       state.totalIntercepted = (state.totalIntercepted || 0) + 1;
       state.activeStreams[streamId] = meta;
       broadcast({ type: "sw-intercept-start", streamId, meta });
       const [clientStream, swStream] = upstream.body.tee();
       const savePromise = (async () => {
-        try {
-          const reader = swStream.getReader();
-          const decoder = new TextDecoder("utf-8");
-          let decodedSoFar = "";
-          let chunkCount = 0;
-          let lastBroadcastMs = 0;
-          const BROADCAST_THROTTLE_MS = 800;
-          const BROADCAST_BYTES = 16 * 1024;
-          while (true) {
-            const { value, done } = await reader.read();
-            if (done) break;
-            chunkCount++;
-            const bytes = value ? value.byteLength || 0 : 0;
-            meta.bytes += bytes;
-            meta.lastProgressAt = Date.now();
-            try {
-              decodedSoFar += decoder.decode(value, { stream: true });
-            } catch (e) {
+        const reader = swStream.getReader();
+        const decoder = new TextDecoder("utf-8");
+        let accumulated = "";
+        let sinceLastSaveBytes = 0;
+        let lastSaveAt = 0;
+        let lastBroadcastAt = 0;
+        async function flushToLastThread(force = false) {
+          try {
+            const nowMs = now();
+            if (!force && sinceLastSaveBytes < SAVE_BYTES_THRESHOLD && nowMs - lastSaveAt < SAVE_TIME_THRESHOLD) return;
+            const threads = await readThreads();
+            let thread = pickLastThread(threads);
+            const createdAt = nowMs;
+            if (!thread) {
+              thread = {
+                id: "sw-thread-" + gid(),
+                title: "Missed while backgrounded",
+                pinned: false,
+                updatedAt: createdAt,
+                messages: []
+              };
+              threads.unshift(thread);
             }
-            const now = Date.now();
-            if (now - lastBroadcastMs > BROADCAST_THROTTLE_MS || meta.bytes >= (meta._lastBroadcastBytes || 0) + BROADCAST_BYTES) {
-              meta._lastBroadcastBytes = meta.bytes;
-              lastBroadcastMs = now;
+            upsertAssistantInThreadObj(thread, streamId, accumulated);
+            await writeThreads(threads);
+            sinceLastSaveBytes = 0;
+            lastSaveAt = nowMs;
+            const now2 = Date.now();
+            if (now2 - lastBroadcastAt > BROADCAST_THROTTLE_MS) {
+              lastBroadcastAt = now2;
               broadcast({
                 type: "sw-intercept-progress",
                 streamId,
-                meta: { bytes: meta.bytes, lastProgressAt: meta.lastProgressAt, snippet: decodedSoFar.slice(-1024) }
+                meta: { bytes: meta.bytes, savedAt: lastSaveAt, snippet: accumulated.slice(-1024) }
               });
             }
+          } catch (err) {
+            console.error("sw: flushToLastThread error", err);
           }
+        }
+        try {
+          while (true) {
+            const { value, done } = await reader.read();
+            if (done) break;
+            let chunkText = "";
+            try {
+              chunkText = decoder.decode(value, { stream: true });
+            } catch (e) {
+              try {
+                chunkText = String(value);
+              } catch (ee) {
+                chunkText = "";
+              }
+            }
+            accumulated += chunkText;
+            const bytes = value ? value.byteLength || 0 : chunkText.length;
+            meta.bytes += bytes;
+            meta.lastProgressAt = now();
+            sinceLastSaveBytes += bytes;
+            await flushToLastThread(false);
+          }
+          await flushToLastThread(true);
           meta.status = "finished";
-          meta.endedAt = Date.now();
-          state.lastStreamSummary = {
-            streamId,
-            url,
-            startedAt: meta.startedAt,
-            endedAt: meta.endedAt,
-            totalBytes: meta.bytes
-          };
+          meta.endedAt = now();
+          state.lastStream = { streamId, url: meta.url, startedAt: meta.startedAt, endedAt: meta.endedAt, totalBytes: meta.bytes };
           delete state.activeStreams[streamId];
           broadcast({ type: "sw-intercept-end", streamId, meta: { totalBytes: meta.bytes, endedAt: meta.endedAt } });
         } catch (err) {
           meta.status = "error";
           meta.error = String(err && err.message ? err.message : err);
-          meta.lastProgressAt = Date.now();
           delete state.activeStreams[streamId];
           broadcast({ type: "sw-intercept-error", streamId, meta: { error: meta.error } });
-          console.error("sw: stream save error", err);
+          console.error("sw: savePromise error", err);
         }
       })();
       event.waitUntil(savePromise);
@@ -105,10 +171,8 @@ self.addEventListener("fetch", (event) => {
         headers: upstream.headers
       });
     })());
-  } catch (e) {
-    console.error("sw: fetch handler error", e);
-  } finally {
-    cleanupState();
+  } catch (err) {
+    console.error("sw: fetch handler error", err);
   }
 });
 self.addEventListener("message", (event) => {
@@ -116,24 +180,24 @@ self.addEventListener("message", (event) => {
   try {
     if (data && data.type === "PING") {
       if (event.ports && event.ports[0]) {
-        event.ports[0].postMessage({ type: "PONG", ts: Date.now(), ok: true });
+        event.ports[0].postMessage({ type: "PONG", ts: now(), ok: true });
       } else if (event.source && typeof event.source.postMessage === "function") {
         try {
-          event.source.postMessage({ type: "PONG", ts: Date.now(), ok: true });
+          event.source.postMessage({ type: "PONG", ts: now(), ok: true });
         } catch (e) {
         }
       } else {
-        broadcast({ type: "PONG", ts: Date.now(), ok: true });
+        broadcast({ type: "PONG", ts: now(), ok: true });
       }
       return;
     }
     if (data && data.type === "PING_STATUS") {
       const reply = {
         type: "PONG_STATUS",
-        ts: Date.now(),
+        ts: now(),
         totalIntercepted: state.totalIntercepted || 0,
         activeStreams: Object.entries(state.activeStreams).map(([id, m]) => ({ streamId: id, url: m.url, bytes: m.bytes, status: m.status, startedAt: m.startedAt })),
-        lastStreamSummary: state.lastStreamSummary || null
+        lastStream: state.lastStream || null
       };
       if (event.ports && event.ports[0]) {
         event.ports[0].postMessage(reply);
@@ -147,10 +211,19 @@ self.addEventListener("message", (event) => {
       }
       return;
     }
-    if (data && data.type === "GET_STATE") {
-      const snapshot = { totalIntercepted: state.totalIntercepted || 0, activeCount: Object.keys(state.activeStreams).length, last: state.lastStreamSummary || null };
-      if (event.ports && event.ports[0]) event.ports[0].postMessage({ type: "STATE", snapshot });
-      else if (event.source && event.source.postMessage) event.source.postMessage({ type: "STATE", snapshot });
+    if (data && data.type === "LIST_SW_SAVED") {
+      (async () => {
+        const threads = await readThreads();
+        const found = [];
+        for (const t of threads || []) {
+          for (const m of t.messages || []) {
+            if (m && m.sw_streamId) found.push({ threadId: t.id, threadTitle: t.title, messageId: m.id, sw_streamId: m.sw_streamId, snippet: (m.content || "").slice(0, 200), updatedAt: m.updatedAt });
+          }
+        }
+        if (event.ports && event.ports[0]) event.ports[0].postMessage({ type: "LIST_SW_SAVED_RESULT", streams: found });
+        else if (event.source && typeof event.source.postMessage === "function") event.source.postMessage({ type: "LIST_SW_SAVED_RESULT", streams: found });
+        else broadcast({ type: "LIST_SW_SAVED_RESULT", streams: found });
+      })();
       return;
     }
   } catch (e) {