fix: use file_get_contents to prevent large JS files (>8KB) from being truncated

[G4Zz0L1]

Problem

When running browser tests, all static JS files larger than 8192 bytes are truncated to exactly 8KB, causing SyntaxError: Unexpected end of input in Playwright. This makes assertNoJavaScriptErrors() fail on any page loading Livewire, Filament, or any Vite bundle.

Evidence

Capturing error details via window.__pestBrowser.jsErrors after waitForLoadState('networkidle'):

[
  { "message": "Uncaught SyntaxError: Unexpected end of input", "filename": ".../livewire.min.js", "lineno": 1, "colno": 8193 },
  { "message": "Uncaught SyntaxError: Unexpected end of input", "filename": ".../support.js",     "lineno": 1, "colno": 8193 },
  { "message": "Uncaught SyntaxError: Invalid or unexpected token", "filename": ".../tables.js", "lineno": 1, "colno": 8189 }
]

colno: 8193 = exactly 8192 bytes received — one AMPHP read chunk.

Root Cause

ReadableResourceStream sets the stream to non-blocking mode (stream_set_blocking($resource, false)). For php://temp in non-blocking mode, AMPHP's fiber event loop only delivers the first 8192-byte chunk and does not schedule further reads within the same request, so files >8KB are silently truncated.

Fix

Replace the fopen/fread/php://temp/ReadableResourceStream pipeline with file_get_contents and a plain string response body. The AMPHP Response accepts a string body and sends it in full, bypassing async read-chunk limitations entirely.

This also supersedes PR #203: the filesize() === 0 guard is no longer needed since file_get_contents on an empty file returns '' rather than crashing.

Fixes pestphp/pest#1664
Also fixes pestphp/pest#1635

[Copilot]

Pull request overview

Fixes truncation of JavaScript assets >8KB when served by the internal Laravel HTTP server during browser tests by switching from an AMPHP resource stream pipeline to a string body response.

Changes:

• Replace fopen/ReadableResourceStream-based asset serving with file_get_contents() + string response body.
• Keep JS URL rewriting but apply it directly to the in-memory string.
• Add explicit Content-Length header based on the final rewritten content.

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[G4Zz0L1]

Addressed both review comments:

Memory concern (r3057164015): Fixed — the file_get_contents + string body path is now limited exclusively to .js files. All other assets (images, fonts, CSS, videos, etc.) keep the original ReadableResourceStream path on the real file handle, which is unaffected by the php://temp non-blocking truncation.

Regression test (r3057164073): Added in tests/Unit/Drivers/Laravel/LaravelHttpServerTest.php — creates a JS file slightly over 8192 bytes with a sentinel string at the end and asserts the full response is returned via assertSee('END_SENTINEL'). Without the fix this test would fail because the sentinel falls after the first 8KB chunk.