fix: suppress browser launch in noui builds

[nmgaston]

Bug: noui builds launch a browser window on startup

When running the console-noui binary (built with -tags=noui), a browser window was being opened on startup. This is incorrect behavior — the noui build is intended for headless/server environments where there is no display or UI.

Root cause

handleDebugMode in cmd/app/main.go unconditionally called go launchBrowser(cfg) whenever GIN_MODE != "debug", with no awareness of the noui build tag.

Fix

Split the browser-launch code into build-tagged files:

File	Build tag	Purpose
browser.go	!noui	Real implementation of launchBrowser, openBrowser, CommandExecutor
browser_noui.go	noui	No-op launchBrowser that does nothing
browser_test.go	!noui	Browser tests moved out of main_test.go to exclude from noui test builds
main.go / main_test.go	—	Removed redundant browser code and unused imports

Testing

Both build variants compile and all tests pass:

go test ./cmd/app/...
go test -tags=noui ./cmd/app/...

[RosieAMT]

🎉 This PR is included in version 1.21.3 🎉

The release is available on:

• GitHub release
• v1.21.3

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