display.go: menu builder now consults menu.Service.ShowDevTools()
and, when enabled, adds Developer > Open DevTools + Close DevTools
menu items. Handlers route to the focused window (or the only open
window) via the existing webview.devtoolsOpen /
webview.devtoolsClose actions — which already land on Wails
WebviewWindow.OpenDevTools / CloseDevTools.
Tests: Good/Bad/Ugly coverage for both MCP tool handlers in
tools_webview_test.go plus a menu-level test in display_test.go
that clicks the built items and verifies mock devtools state flips
open/closed, with a disabled-config case.
tools_webview.go already had the handlers + registration on this
branch; locked down with tests instead of re-implementing.
Closes tasks.lthn.sh/view.php?id=31
Co-authored-by: Codex <noreply@openai.com>
Co-Authored-By: Virgil <virgil@lethean.io>
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