feat(browser): add opt-in Google Chrome Beta support

[kvncrw]

Summary

Adds an opt-in way to install and use Google Chrome Beta (google-chrome-beta from the AUR) as a selectable browser in Omarchy, alongside the existing chrome/brave/edge/firefox/zen choices.

This does not change the default browser. omarchy-chromium remains the default for everyone. Chrome Beta only appears as an additional choice a user explicitly opts into via Setup > Install > Browser > Chrome Beta (or omarchy install browser chrome-beta). Nobody who doesn't ask for it is affected.

Motivation

A growing number of Omarchy users run AI coding agents that drive a browser programmatically — via Playwright or the Chrome DevTools Protocol (CDP) — for tasks like end-to-end testing, scraping, and agentic web automation. That workload has a hard requirement that ordinary browsing doesn't: the local browser has to stay close to upstream Chromium.

Concretely:

• DevTools Protocol surface. Automation tools target a moving CDP surface. A browser that tracks upstream closely exposes the newer CDP domains/commands those tools expect; a lagging stable build silently lacks them, producing confusing "method not found" / "unsupported" failures.
• --remote-debugging-port reliability under Wayland. Headless and remote-controlled launches on Wayland are sensitive to the exact Chromium build and its packaging. The upstream-tracking Google channel behaves predictably here, where distro-patched builds sometimes don't.
• Version-skew against Playwright's expected revision. Playwright pins an expected browser revision. Running a stable distro Chromium that lags upstream — or carries downstream packaging patches — is a common source of flaky, hard-to-debug automation, because the driver and the browser disagree about capabilities.

A stable distro Chromium is the right default for daily browsing, but for the automation use case it's frequently either behind upstream or patched in ways that make headless/remote-controlled use flaky. An opt-in Chrome Beta gives those users a browser that "just works" for automation without imposing a beta channel on everyone else.

Chrome Beta (not Dev/Canary) is deliberately chosen: it tracks upstream closely enough to solve the skew problem while still being stable enough for real use.

What changed

Wiring mirrors the existing chrome channel exactly — no new patterns introduced:

File	Change
bin/omarchy-install-browser	New chrome-beta case: installs AUR google-chrome-beta, writes ~/.config/chrome-beta-flags.conf (the flags file the Chrome Beta wrapper actually reads), reuses the shared /etc/opt/chrome/policies/managed policy dir, applies the current theme color.
bin/omarchy-remove-browser	New chrome-beta case. Both chrome and chrome-beta now guard removal of the shared color.json so removing one Chrome channel doesn't strip the managed policy while the other channel is still installed (same shared-dir guard pattern already used for Brave / Brave Origin).
bin/omarchy-default-browser	Maps chrome-beta ↔ google-chrome-beta.desktop (both directions).
bin/omarchy-theme-set-browser	Refreshes a running google-chrome-beta so theme color changes apply live.
bin/omarchy-menu	Adds Chrome Beta to the Install, Remove, and Default Browser submenus. The *"Chrome Beta"* glob arm is ordered before *Chrome* (same specific-before-general ordering already used for Brave Origin vs Brave).

Command metadata (omarchy:args / usage strings) updated to include chrome-beta.

How a user opts in

Via the menu:

Super (Omarchy menu) > Install > Browser > Chrome Beta

Or directly:

omarchy install browser chrome-beta

The install prints Chrome Beta browser installed. Make it the default via Setup > Defaults > Browser. — it intentionally leaves the default browser untouched. Setting it as default (optional) is a separate explicit step:

omarchy default browser chrome-beta

Removal:

omarchy remove browser chrome-beta

Testing

• bash test/omarchy-cli-test.sh — full suite passes (including the metadata/route assertions).
• bash -n clean on all five modified scripts.
• Verified omarchy install browser --help and the usage strings surface chrome-beta.

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Opened as a draft for maintainer review of the approach before finalizing.