[codex] Polish sidebar status, agent skills, and chat rendering (#45451)

* style: update chat layout and spacing for improved UI consistency

- Adjusted margin and padding for .chat-thread and .content--chat to enhance layout.
- Consolidated CSS selectors for better readability and maintainability.
- Introduced new test for log parsing functionality to ensure accurate message extraction.

* UI: polish agent skills, chat images, and sidebar status

* test: stabilize vitest helper export types

* UI: address review feedback on agents refresh and chat styles

* test: update outbound gateway client fixture values

* test: narrow shared ip fixtures to IPv4

src/infra/outbound/outbound-send-service.test.ts

@@ -1,4 +1,5 @@
 import { beforeEach, describe, expect, it, vi } from "vitest";
+import { GATEWAY_CLIENT_MODES, GATEWAY_CLIENT_NAMES } from "../../utils/message-channel.js";
 
 const mocks = vi.hoisted(() => ({
   getDefaultMediaLocalRoots: vi.fn(() => []),
@@ -204,8 +205,8 @@ describe("executeSendAction", () => {
           url: "http://127.0.0.1:18789",
           token: "tok",
           timeoutMs: 5000,
-          clientName: "gateway",
-          mode: "gateway",
+          clientName: GATEWAY_CLIENT_NAMES.GATEWAY_CLIENT,
+          mode: GATEWAY_CLIENT_MODES.BACKEND,
         },
       },
       to: "channel:123",
@@ -296,8 +297,8 @@ describe("executeSendAction", () => {
           url: "http://127.0.0.1:18789",
           token: "tok",
           timeoutMs: 5000,
-          clientName: "gateway",
-          mode: "gateway",
+          clientName: GATEWAY_CLIENT_NAMES.GATEWAY_CLIENT,
+          mode: GATEWAY_CLIENT_MODES.BACKEND,
         },
       },
       to: "channel:123",