Revert "fix: no right-click Cut/Copy/Paste in release builds"

Reverts 30d8827. Ctrl+C / Ctrl+V already work in the app, so the WebView's
default menu only added Refresh / Save as on the neutral areas — noise in an
application window, for nothing gained. Changelog entry dropped with it.

main.go

@@ -118,12 +118,6 @@ func main() {
 		// buttons. Windows still draws the resize borders and honours Aero Snap,
 		// which is why the frame is dropped rather than the whole chrome.
 		Frameless: true,
-		// Right-click → Cut / Copy / Paste. Wails disables the WebView's context
-		// menu in production builds, so an operator could not paste a cluster
-		// address, an API key or a callsign anywhere in the app — Ctrl+V worked,
-		// but nothing said so, and pasting is exactly what you do with a key
-		// copied off a web page.
-		EnableDefaultContextMenu: true,
 		// Start hidden and reveal only once the saved position has been applied and
 		// the DOM has painted (OnDomReady → domReady) — so the window appears
 		// already at its final size and position, with no post-launch jump.