init layout, notifications, tabs & more

Signed-off-by: Hadi <112569860+anotherhadi@users.noreply.github.com>

bubbles/viewport.go

@@ -0,0 +1,38 @@
+package bubbles
+
+import (
+	"strings"
+
+	"charm.land/bubbles/v2/viewport"
+	"charm.land/lipgloss/v2"
+
+	"github.com/anotherhadi/ilovetui/style"
+)
+
+// NewViewport returns a viewport.Model with mouse wheel disabled.
+func NewViewport() viewport.Model {
+	vp := viewport.New()
+	vp.MouseWheelEnabled = false
+	return vp
+}
+
+// ViewportView renders the viewport and appends a subtle scroll indicator
+// on the last visible line when the user has not reached the bottom.
+func ViewportView(vp *viewport.Model) string {
+	v := vp.View()
+	if vp.AtBottom() {
+		return v
+	}
+	lines := strings.Split(v, "\n")
+	if len(lines) == 0 {
+		return v
+	}
+	arrow := lipgloss.NewStyle().Foreground(style.S.Subtle).Render("↓")
+	arrowW := lipgloss.Width(arrow)
+	inner := vp.Width() - 2*arrowW
+	if inner < 0 {
+		inner = 0
+	}
+	lines[len(lines)-1] = arrow + strings.Repeat(" ", inner) + arrow
+	return strings.Join(lines, "\n")
+}