style(ui): professional rectangular grayscale theme (Premiere/Resolve style without rounded corners)

main.go

@@ -46,7 +46,7 @@ func main() {
 		AssetServer: &assetserver.Options{
 			Assets: assets,
 		},
-		BackgroundColour: &options.RGBA{R: 11, G: 15, B: 23, A: 1},
+		BackgroundColour: &options.RGBA{R: 28, G: 28, B: 28, A: 1},
 		Frameless:        true,
 		OnStartup:        app.startup,
 		OnShutdown:       app.shutdown,
@@ -57,12 +57,12 @@ func main() {
 		Windows: &windows.Options{
 			WebviewIsTransparent:              false,
 			WindowIsTranslucent:               false,
-			DisableFramelessWindowDecorations: false,
+			DisableFramelessWindowDecorations: true,
 			Theme:                             windows.Dark,
 			CustomTheme: &windows.ThemeSettings{
-				DarkModeTitleBar:  windows.RGB(17, 24, 39),
-				DarkModeTitleText: windows.RGB(241, 245, 249),
-				DarkModeBorder:    windows.RGB(36, 48, 68),
+				DarkModeTitleBar:  windows.RGB(37, 37, 37),
+				DarkModeTitleText: windows.RGB(212, 212, 212),
+				DarkModeBorder:    windows.RGB(56, 56, 56),
 			},
 		},
 		Bind: []interface{}{