[FEATURE]:Configurable Playwright browser launch options for Apple Silicon / Metal acceleration

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Describe the enhancement you want to request

The built-in Playwright browser tools (browser_navigate, browser_click, etc.) launch Chromium with hardcoded arguments. There is currently no opencode.jsonc config key to override them.

On Apple Silicon Macs (M1–M5), the default launch misses key performance flags:

--headless=new — new headless mode with full GPU pipeline support
--use-gl=angle / --use-angle=metal — force Metal API for rendering
--disable-dev-shm-usage — avoid /dev/shm bottleneck on machines with large RAM
Without these, Playwright workloads waste CPU/WindowServer resources and underutilize the GPU.

Proposed config
{
"playwright": {
"launchOptions": {
"headless": true,
"args": [
"--headless=new",
"--use-gl=angle",
"--use-angle=metal",
"--disable-dev-shm-usage"
]
}
}
}
Alternatively, a simpler escape hatch:

{
"playwright": {
"extraLaunchArgs": ["--headless=new", "--use-angle=metal"]
}
}
Use case
Running browser automation in headless mode on M-series Macs while keeping GPU acceleration via Metal. Reduces CPU load, WindowServer overhead, and improves throughput — especially important for overnight batch agents.

Workaround
Currently using a custom MCP server with a user-owned Playwright instance as a replacement. Native support would eliminate that overhead.