feat(ui): add viewport tooltips

Reuse ribbon tooltip styling for every viewport toolbar action and expose translated action names with related commands.

Refs #482

src/ui/ribbon/mod.rs

@@ -28,6 +28,14 @@ pub use collapse::CollapseMode;
 use crate::ui::wrap_bar::{PosReport, WrapBar, WrapFlow};
 use crate::t;
 
+pub(crate) fn tooltip_content(text: String) -> Element<'static, Message> {
+    widgets::make_tip(text)
+}
+
+pub(crate) fn tooltip_style(theme: &Theme) -> container::Style {
+    widgets::tip_style(theme)
+}
+
 // ── Ribbon state ───────────────────────────────────────────────────────────
 
 pub struct Ribbon {