diff --git a/packages/app-bundle/manifest.json b/packages/app-bundle/manifest.json
index 9bf0ed071..0a0e9fd59 100644
--- a/packages/app-bundle/manifest.json
+++ b/packages/app-bundle/manifest.json
@@ -196,8 +196,8 @@
     "packages/app/src/context/platform.tsx": "edd9b1773feb5c084b922a57b6914f6a473eed558b44f9de0eeb1c4d4e2b49da",
     "packages/app/src/context/question-inbox.test.ts": "d4e2c666194fe6463d1a1da1901f2aef3b6a17eec00394a2b020d7ce698d4c92",
     "packages/app/src/context/question-inbox.ts": "f42a2490670e44578f88d626bc0db0a0205fa2b5ec7cd719ba0544915f3a6179",
-    "packages/app/src/context/server-sdk.test.ts": "aa3815ee62cb933fd30895be924ed2074aef7fb90bcbf6cb39ad1dce687e04d8",
-    "packages/app/src/context/server-sdk.tsx": "5056b168d2ba0445beca4c6d07f2e43b6f46b4aefd5802b16d530ce544f26569",
+    "packages/app/src/context/server-sdk.test.ts": "c8c4a04846c2e5c0e3e91596f104f76994c92b116a755908fcbce2655a8a0234",
+    "packages/app/src/context/server-sdk.tsx": "9dc721c54074a323fb879aedf76cf29c1888088ab6b9b0c68aae683ca4f563f1",
     "packages/app/src/context/server-session-child-active.test.ts": "de8c467f67f88b6cce351c1805ec90728cf238eb1ef32f39ffdbbf3de4dcec22",
     "packages/app/src/context/server-session-orphan-part.test.ts": "1d635374c0bfff25a01825061aabac7334e5cdaedca2dab9f3d9467ff543caea",
     "packages/app/src/context/server-session.test.ts": "31b14c85a843eb172899f456566ad7ab7d07a22eaf8b31d29a22e255e95cb96b",
@@ -503,7 +503,7 @@
     "packages/session-ui/src/components/message-part-user.ts": "1f2c8cb4efff5274863a133f369a7397cac804678e953740f356ae03b71d475c",
     "packages/session-ui/src/components/message-part.css": "ae592deb33739738f6a7fc6a3460b7146803bdd05cbbf46f1cfd2c5cec421392",
     "packages/session-ui/src/components/message-part.test.ts": "7c66430837fa3d2607657e57e35720ae68dc5e84662e12826713a938301eeb7b",
-    "packages/session-ui/src/components/message-part.tsx": "dda5104168d8b841c5f96bb27737d49375b19f68e64f1f6a7c9e7776ae332164",
+    "packages/session-ui/src/components/message-part.tsx": "298ed64a50b0417c45b81d05f7ba32d9f8fdf3ac8a24ea7806a89964e1f684b5",
     "packages/session-ui/src/components/session-retry.tsx": "2cb1513d73275a269894f601e8c1d29bc790b14927134fe36177f2b371888721",
     "packages/session-ui/src/components/session-review.css": "ec8c5b359dd4b7ff80d7fad8906359678adade9ce62c9d74aedc000b646db341",
     "packages/session-ui/src/components/session-review.test.ts": "41515bba238b4e60ce3d80e206013e9b43e3b0d0a51be45796028dbae47c99ae",
@@ -1011,7 +1011,7 @@
     "packages/ui/src/v2/components/text-shimmer-v2.tsx"
   ],
   "exceptions": [],
-  "extracted_at": "2026-10-22T12:38:18.375Z",
+  "extracted_at": "2026-10-22T13:11:47.632Z",
   "per_package": {
     "packages/app": {
       "A": 254,
diff --git a/packages/app-bundle/overlay/packages/app/src/context/server-sdk.test.ts b/packages/app-bundle/overlay/packages/app/src/context/server-sdk.test.ts
index 6e88fdc6d..fcdd681d2 100644
--- a/packages/app-bundle/overlay/packages/app/src/context/server-sdk.test.ts
+++ b/packages/app-bundle/overlay/packages/app/src/context/server-sdk.test.ts
@@ -16,6 +16,7 @@ import {
   globalStreamResetRequired,
   postEventStreamUrlAssert,
   resumeStreamAfterPageShow,
+  parseSseFrame,
 } from "./server-sdk"
 import { armRemoteCreate, attachOwnerHeaderIfArmed, disarmRemoteCreate } from "@/components/remote-create-arm"
 import type { OpenCodeEvent } from "@opencode-ai/client/promise"
@@ -724,3 +725,27 @@ describe("composeArmedRequestHeaders (remote-create Authorization preservation)"
   })
 })
 
+
+// #1843 — the webview fetch path's SDK reader yields raw SSE `data:` lines as
+// strings (the platform path yields parsed objects); a string frame hit
+// `"payload" in event` as a TypeError and killed the whole global event stream
+// loop, every frame (the live recurring "[global-sdk] event stream failed").
+describe("parseSseFrame (#1843)", () => {
+  test("a JSON object line parses to the record", () => {
+    expect(parseSseFrame('{"directory":"/home/aaron/x","payload":{"type":"message.updated"}}')).toEqual({
+      directory: "/home/aaron/x",
+      payload: { type: "message.updated" },
+    })
+  })
+
+  test("malformed lines and non-objects skip (undefined), never throw", () => {
+    expect(parseSseFrame("not json")).toBeUndefined()
+    expect(parseSseFrame("[1,2]")).toBeUndefined()
+    expect(parseSseFrame("null")).toBeUndefined()
+    expect(parseSseFrame("42")).toBeUndefined()
+  })
+
+  test("empty string skips", () => {
+    expect(parseSseFrame("")).toBeUndefined()
+  })
+})
diff --git a/packages/app-bundle/overlay/packages/app/src/context/server-sdk.tsx b/packages/app-bundle/overlay/packages/app/src/context/server-sdk.tsx
index 84ad9be08..0dcdd0d28 100644
--- a/packages/app-bundle/overlay/packages/app/src/context/server-sdk.tsx
+++ b/packages/app-bundle/overlay/packages/app/src/context/server-sdk.tsx
@@ -48,6 +48,28 @@ type CurrentDelta = Extract<
 
 // The named V2 types are adapted only in their V2 shape (payload in `data`);
 // a V1-shaped frame of the same name falls through to the default case raw.
+export function parseSseFrame(raw: string): Record<string, unknown> | undefined {
+  try {
+    const value: unknown = JSON.parse(raw)
+    if (value !== null && typeof value === "object" && !Array.isArray(value)) return value as Record<string, unknown>
+    return undefined
+  } catch {
+    return undefined
+  }
+}
+
+/** #1843: the legacy fan-in wrapper — {directory, payload} frames (the
+ *  frontdoor's merged-group wire shape, and what parsed string frames are). */
+function isLegacyWireFrame(value: unknown): value is { directory?: string; payload: Record<string, unknown> } {
+  return !!value && typeof value === "object" && "payload" in value && typeof value.payload === "object"
+}
+
+/** #1843: either wire vocabulary (V1 `properties` frames or V2 `data` frames
+ *  — the WireEvent union). Anything else is an unknown shape, skipped. */
+function isWireEvent(value: unknown): value is WireEvent {
+  return !!value && typeof value === "object" && "type" in value
+}
+
 export function adaptServerEvent(event: WireEvent): ServerEvent {
   if (event.type === "permission.v2.asked" && "data" in event) {
     return {
@@ -709,9 +731,20 @@ function createServerSdkContextBase(server: ServerConnection.Any, scope: ServerS
             // again, so force the resync now (the refetch cannot miss the events
             // between the end and this re-subscription).
             if (streamEndResync.frame()) setResyncCount((n) => n + 1)
-            const legacy = "payload" in event
-            const directory = legacy ? (event.directory ?? "global") : (event.location?.directory ?? "global")
-            const payload = legacy ? (event.payload as Event) : adaptServerEvent(event)
+            // #1843: the webview fetch path's SDK reader yields raw SSE `data:`
+            // lines as STRINGS (the platform path yields parsed objects) — a
+            // string frame hit `"payload" in event` as a TypeError and killed
+            // the whole stream loop, every frame, all day (the recurring
+            // "[global-sdk] event stream failed"). Parse strings before the
+            // discrimination; a malformed line skips (named, never kills).
+            const parsed = typeof event === "string" ? parseSseFrame(event) : event
+            if (parsed === undefined) continue
+            const legacy = isLegacyWireFrame(parsed)
+            if (!legacy && !isWireEvent(parsed)) continue
+            const directory = legacy
+              ? parsed.directory ?? "global"
+              : (parsed as { location?: { directory?: string } }).location?.directory ?? "global"
+            const payload = legacy ? (parsed.payload as unknown as Event) : adaptServerEvent(parsed)
             // #1522 (ADR 0033 decision A): the SSE fan-in aggregator emits
             // `amicode.fleet.focus` as the first frame on (re)connect. Intercept
             // it here and dispatch to the existing picker focus latch via
@@ -764,13 +797,13 @@ function createServerSdkContextBase(server: ServerConnection.Any, scope: ServerS
             // replayed frame already applied is dropped, never applied twice.
             const verdict = cursor.frame({
               id: kind === "v1" ? frameSseId : undefined,
-              type: legacy ? event.payload.type : payload.type,
+              type: payload.type,
             })
             if (verdict.resync) forceResync(verdict.resync.namespaces)
             if (!verdict.apply) continue
             persistCursor()
             // a sync copy still moves the cursor (it holds a seq), but is no event
-            if (legacy && event.payload.type === "sync") continue
+            if (legacy && parsed.payload.type === "sync") continue
             // #1539: the origin is the composite cursor's moving namespace.
             // Fleet-of-one (a bare engine id) is always local.
             const taggedPayload: ServerEvent = verdict.origin !== undefined
diff --git a/packages/app-bundle/overlay/packages/session-ui/src/components/message-part.tsx b/packages/app-bundle/overlay/packages/session-ui/src/components/message-part.tsx
index bd40a630d..d02d23dbc 100644
--- a/packages/app-bundle/overlay/packages/session-ui/src/components/message-part.tsx
+++ b/packages/app-bundle/overlay/packages/session-ui/src/components/message-part.tsx
@@ -2713,7 +2713,23 @@ ToolRegistry.register({
           defer={props.deferContent !== false}
           trigger={
             <div data-component="edit-trigger">
-              <div data-slot="message-part-title-area">
+              <div
+                data-slot="message-part-title-area"
+                data-clickable={path() ? "true" : undefined}
+                title={path()}
+                onClick={(event) => {
+                  // #1843: the whole title area opens the file, not just the
+                  // filename glyph — the live report clicked the row (the
+                  // directory span sits between the filename and the edge) and
+                  // got nothing. Only the button behavior changes: prevent +
+                  // stopPropagation so the tool body's expand/collapse doesn't
+                  // fire alongside, exactly like the filename button.
+                  if (!path() || pending()) return
+                  event.preventDefault()
+                  event.stopPropagation()
+                  openFileInEditor(path())
+                }}
+              >
                 <div data-slot="message-part-title">
                   <span data-slot="message-part-title-text">
                     <span data-pending={pending() ? "true" : "false"}>{i18n.t("ui.messagePart.title.edit")}</span>