fix: bootstrap embedded chat prompting state and review read-only handling

Pass initial subagent prompting settings into embedded chat URLs and views
Prevent inactive embedded chats from stealing focus on load
Treat review sessions as independent conversations when resolving prompt read-only state

packages/ui/src/components/chat/chatPromptReadOnly.test.ts

@@ -2,6 +2,7 @@ import { describe, expect, test } from 'bun:test';
 import type { Session } from '@opencode-ai/sdk/v2';
 
 import { resolveChatPromptReadOnly } from './chatPromptReadOnly';
+import { withReviewSessionMarker } from '@/lib/sessionReviewMetadata';
 
 const session = (parentID?: string): Session => ({
     id: 'session',
@@ -27,4 +28,14 @@ describe('resolveChatPromptReadOnly', () => {
         expect(resolveChatPromptReadOnly(session(), true, true)).toBe(true);
         expect(resolveChatPromptReadOnly(session(), true, false)).toBe(false);
     });
+
+    test('treats a marked code review as an independent session even with a stale parent ID', () => {
+        const reviewSession = {
+            ...session('original'),
+            metadata: withReviewSessionMarker({}, 'original'),
+        } as Session;
+
+        expect(resolveChatPromptReadOnly(reviewSession, false, false)).toBe(false);
+        expect(resolveChatPromptReadOnly(reviewSession, true, true)).toBe(true);
+    });
 });