[Bug]: routeFromHAR fails with "Specified archive does not have a .har file" when inner zip entry has uppercase .HAR extension #43669

import { test, expect } from '@playwright/test';

test('repro uppercase har entry in zip', async ({ context }) => {
  // archive.har.zip holds a valid HAR entry named "Recording.HAR"
  await context.routeFromHAR('archive.har.zip');
});

### Expected behavior

The HAR archive should replay successfully regardless of inner entry casing, matching the case-insensitive .zip extension handling introduced in #43550.

### Actual behavior

Fails with:
Error: Specified archive does not have a .har file

This occurs because localUtils.ts uses entryNames.find(e => e.endsWith('.har')) case-sensitively, so valid archives with entries like Recording.HAR or session.Har are rejected.

### Additional context

This is the inner-entry counterpart to #43550 (`fix(har): recognize .zip extensions regardless of case`). While #43550 made the archive file extension case-insensitive, the entry name checks inside `packages/playwright-core/src/server/localUtils.ts` remained case-sensitive:

```diff
diff --git a/packages/playwright-core/src/server/localUtils.ts b/packages/playwright-core/src/server/localUtils.ts
index df62972b2..2be37ea7a 100644
--- a/packages/playwright-core/src/server/localUtils.ts
+++ b/packages/playwright-core/src/server/localUtils.ts
@@ -153,7 +153,7 @@ export async function harOpen(progress: Progress, harBackends: Map<string, HarBa
   const zipFile = new ZipFile(params.file);
   try {
     const entryNames = await progress.race(zipFile.entries());
-    const harEntryName = entryNames.find(e => e.endsWith('.har'));
+    const harEntryName = entryNames.find(e => /\.har$/i.test(e));
     if (!harEntryName)
       return { error: 'Specified archive does not have a .har file' };
     const har = await progress.race(zipFile.read(harEntryName));
@@ -193,7 +193,7 @@ export async function harUnzip(progress: Progress, params: channels.LocalUtilsHa
   try {
     for (const entry of await progress.race(zipFile.entries())) {
       const buffer = await progress.race(zipFile.read(entry));
-      if (entry === 'har.har') {
+      if (/^har\.har$/i.test(entry)) {
         await progress.race(fs.promises.writeFile(params.harFile, buffer));
       } else {
         if (!resourcesDirCreated) {