test(e2e): backport three stale e2e test fixes from main to rc/1.106.0 (#47229)

Takes the main version of each file, which is the rc copy plus one main commit:
- test_image_generation_e2e.py from #46998 (Nova Canvas reached end of life)
- test_bedrock_converse.py from #45530 (ask an uncached model once more)
- migratedPages.spec.ts from #45863 (/ui/ lands on Home since #45858)

tests/e2e/claude_code/prompt_caching_5m/test_bedrock_converse.py

@@ -15,7 +15,7 @@ The (feature, provider) for this cell is inferred from the file path by
 
 from __future__ import annotations
 
-from typing import Any, Mapping, Optional
+from typing import Any, Dict, Final, Mapping, Optional, Sequence
 
 import pytest
 
@@ -23,6 +23,7 @@ from e2e_metadata import Capability, Domain, Mode, Provider, Route, Subject, met
 from claude_code._env import require_proxy
 from claude_code.cli_driver import (
     ClaudeCLIError,
+    ModelResult,
     failure_diagnostic,
     run_claude_models_parallel,
 )
@@ -62,12 +63,21 @@ def test_prompt_caching_5m_bedrock_converse(compat_result):
     upstream usage block surfaces a non-zero cache token count."""
     base_url, api_key = require_proxy(compat_result)
 
-    outcomes = run_claude_models_parallel(
-        models=BEDROCK_CONVERSE_MODELS,
-        prompt="Reply with the single word 'pong' and nothing else.",
-        base_url=base_url,
-        api_key=api_key,
+    def run(models: Sequence[str]) -> Dict[str, ModelResult]:
+        return run_claude_models_parallel(
+            models=models,
+            prompt="Reply with the single word 'pong' and nothing else.",
+            base_url=base_url,
+            api_key=api_key,
+        )
+
+    first: Final = run(BEDROCK_CONVERSE_MODELS)
+    uncached: Final = tuple(
+        model
+        for model, outcome in first.items()
+        if not isinstance(outcome, ClaudeCLIError) and outcome.exit_code == 0 and _cache_tokens(outcome.usage) <= 0
     )
+    outcomes: Final = {**first, **run(uncached)} if uncached else first
 
     failures = []
     for model in BEDROCK_CONVERSE_MODELS:

tests/e2e/llm_translation/test_image_generation_e2e.py

@@ -24,7 +24,10 @@ from sdk_clients import SdkClients
 pytestmark = pytest.mark.e2e
 
 OPENAI_IMAGE_BACKEND: Final = "openai/gpt-image-1-mini"
-BEDROCK_IMAGE_BACKEND: Final = "bedrock/amazon.nova-canvas-v1:0"
+BEDROCK_IMAGE_BACKEND: Final = "bedrock/stability.stable-image-core-v1:1"
+# Nova Canvas reached end of life on 2026-09-30. Stable Image Core is active on Bedrock only in us-west-2:
+# https://docs.aws.amazon.com/bedrock/latest/userguide/model-card-stability-ai-stable-image-core-1-0.html (2026-10-16)
+BEDROCK_IMAGE_REGION: Final = "us-west-2"
 
 
 class _OptionalImageBody(BaseModel):
@@ -96,10 +99,10 @@ class TestImageGeneration:
                 model=BEDROCK_IMAGE_BACKEND,
                 aws_access_key_id="os.environ/AWS_ACCESS_KEY_ID",
                 aws_secret_access_key="os.environ/AWS_SECRET_ACCESS_KEY",
-                aws_region_name="os.environ/AWS_REGION",
+                aws_region_name=BEDROCK_IMAGE_REGION,
             ),
         )
-        images = sdk.openai(key).images.generate(model=model, prompt="Draw a cute cat", n=1, size="1024x1024")
+        images = sdk.openai(key).images.generate(model=model, prompt="Draw a cute cat")
         _assert_image_returned(images)
 
     @pytest.mark.skip(reason="stage red: product gap, /v1/images/generations 500s (aimage_generation TypeError) on missing prompt instead of 400")

tests/e2e/ui/tests/migration/migratedPages.spec.ts

@@ -6,6 +6,7 @@ import { proxyIsPremium } from "../../helpers/premium";
 
 const ROOT = (process.env.SERVER_ROOT_PATH ?? "").replace(/\/+$/, "");
 const apiKeys = MIGRATED_E2E_PAGES["api-keys"];
+const home: MigratedPage = { segment: "", linkName: "Home", content: { role: "heading", name: "Home" } };
 
 async function expectContent(page: Page, destination: MigratedPage): Promise<void> {
   await expect(sidebarLink(page, apiKeys.linkName)).toBeVisible({ timeout: 20_000 });
@@ -40,7 +41,7 @@ test.describe("App Router migrated pages", () => {
       const landing = await page.goto(`${ROOT}/ui/`);
       expect(landing?.ok(), "dashboard document loads successfully").toBe(true);
       await dismissFeedbackPopup(page);
-      await expectContent(page, apiKeys);
+      await expectContent(page, home);
 
       await navigateToDestination(page, destination);
 
@@ -63,7 +64,7 @@ test.describe("App Router migrated pages", () => {
     const landing = await page.goto(`${ROOT}/ui/`);
     expect(landing?.ok(), "dashboard document loads successfully").toBe(true);
     await dismissFeedbackPopup(page);
-    await expectContent(page, apiKeys);
+    await expectContent(page, home);
 
     for (const destination of [apiKeys, MIGRATED_E2E_PAGES.models, apiKeys]) {
       await navigateToDestination(page, destination);