refactor: one copy of the UI's repeated helpers

- Text inputs come from newTextInput; the link and folder prompts share one width.
- One starred-first sort for sources, vaults and secrets; accountOf where the account was cut from the label by hand.
- One helper each for the reveal and clipboard countdowns' tick and seconds, the "Open with" choices, the vaults-loaded count, and Go to's and the panes' tabs.
- The details pane builds its label prefix, indent, note and source once; list rows mark matches with MarkMatches.
- The release page opens through openPage, so it now says it opened, as other pages do.
- The cache's account filter is built once per load or save, not per key.

internal/ui/panes/box.go

@@ -69,3 +69,20 @@ func TitleStyle(st styles.Styles, focused bool) lipgloss.Style {
 	}
 	return st.TitleBlurred
 }
+
+// Tabs draws tab names for a title in style ts, the current one
+// underlined and the rest muted.
+func Tabs(st styles.Styles, ts lipgloss.Style, names []string, current int) string {
+	var out string
+	for i, name := range names {
+		if i > 0 {
+			out += ts.Render(" - ")
+		}
+		if i == current {
+			out += ts.Underline(true).Render(name)
+		} else {
+			out += st.Muted.Render(name)
+		}
+	}
+	return out
+}