gui: the toolbar in the order things happen, and an About block

The Plan bar now reads left to right as the work does: which
directory, how it should be listed, what of it, where it is on disk -
then Scan, and only then what to do with what came back. Scan carries
the theme's accent, being the button that starts everything.

Settings ends with About: the program and the version it was built
as, what it is in a sentence, the licence, and who to write to. The
text is model.About so it is tested; ui.Version is stamped by main.

leak-check knows krino's own contact address, so the address check
stays useful without a per-clone setting.

6 files changed, 101 insertions, 7 deletions

diff --git a/gui/cmd/krino-gui/main.go b/gui/cmd/krino-gui/main.go
index f9a9759..25f4837 100644
--- a/gui/cmd/krino-gui/main.go
+++ b/gui/cmd/krino-gui/main.go
@@ -35,6 +35,7 @@ func main() {
 	}
 	e.CacheDir = cacheDir()
 
+	ui.Version = version
 	app := gtk.NewApplication("xyz.labunix.krino", 0)
 	app.ConnectActivate(func() { ui.NewWindow(app, e).Show() })
 	if code := app.Run(nil); code != 0 {
diff --git a/gui/internal/model/about.go b/gui/internal/model/about.go
new file mode 100644
index 0000000..e92a0f4
--- /dev/null
+++ b/gui/internal/model/about.go
@@ -0,0 +1,27 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+package model
+
+// The people and terms behind the program, in one place so About and any
+// later --about agree. The repository line joins these once there is a
+// public one to name.
+const (
+	Author  = "Lukasz Kasprzak"
+	Contact = "contact@labunix.xyz"
+	Licence = "GPL-3.0-or-later"
+)
+
+// About is the block Settings shows at its foot: what this is, which build
+// it is, and under what terms. The first line names the program and its
+// version; the rest are the small print.
+func About(version string) []string {
+	if version == "" {
+		version = "dev"
+	}
+	return []string{
+		"krino " + version,
+		"A rule-based file sorter: it reads a directory, works out what belongs where, shows you the plan, and only then moves anything.",
+		"Licence: " + Licence + " - free software, with no warranty.",
+		"By " + Author + ", " + Contact,
+	}
+}
diff --git a/gui/internal/model/about_test.go b/gui/internal/model/about_test.go
new file mode 100644
index 0000000..00a6718
--- /dev/null
+++ b/gui/internal/model/about_test.go
@@ -0,0 +1,43 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+package model_test
+
+import (
+	"strings"
+	"testing"
+
+	"krino/gui/internal/model"
+)
+
+// TestAboutSaysWhatItIs: the About block names the program, the version it
+// was built as, the licence, who wrote it and how to reach them.
+func TestAboutSaysWhatItIs(t *testing.T) {
+	lines := model.About("0.0.12")
+	if len(lines) == 0 {
+		t.Fatal("About returned nothing")
+	}
+	whole := strings.Join(lines, "\n")
+	for _, want := range []string{
+		"krino",
+		"0.0.12",
+		"GPL-3.0-or-later",
+		"Lukasz Kasprzak",
+		"contact@labunix.xyz",
+	} {
+		if !strings.Contains(whole, want) {
+			t.Errorf("About does not mention %q:\n%s", want, whole)
+		}
+	}
+	if !strings.HasPrefix(lines[0], "krino ") {
+		t.Errorf("the first line should name the program and version, got %q", lines[0])
+	}
+}
+
+// TestAboutWithoutAVersion: a plain `go build` leaves "dev", and About says
+// so rather than printing an empty version.
+func TestAboutWithoutAVersion(t *testing.T) {
+	lines := model.About("")
+	if !strings.Contains(lines[0], "dev") {
+		t.Errorf("an unstamped build should read as dev, got %q", lines[0])
+	}
+}
diff --git a/gui/internal/ui/plan.go b/gui/internal/ui/plan.go
index 5daba6a..fe99a18 100644
--- a/gui/internal/ui/plan.go
+++ b/gui/internal/ui/plan.go
@@ -92,6 +92,10 @@ func newPlanView(w *Window) *planView {
 	p.path.SetMaxWidthChars(20)
 	p.dirs.Connect("notify::selected", p.showPath)
 	p.scan = gtk.NewButtonWithLabel("Scan")
+	// The one button that starts everything, so it carries the theme's
+	// accent like Apply does (his request, 2026-09-17).
+	p.scan.AddCSSClass("suggested-action")
+	p.scan.SetTooltipText("read the directory and work out what would happen to each file; nothing is touched until Apply")
 	p.selAll = gtk.NewButtonWithLabel("Select all")
 	p.selNone = gtk.NewButtonWithLabel("None")
 	p.apply = gtk.NewButtonWithLabel("Apply")
@@ -104,26 +108,28 @@ func newPlanView(w *Window) *planView {
 	bar.SetMarginStart(6)
 	bar.SetMarginEnd(6)
 	bar.SetMarginBottom(6)
-	bar.Append(gtk.NewLabel("Directory"))
-	bar.Append(p.dirs)
-	bar.Append(p.scan)
 	// A filter over the plan: type a few letters of a name, as fzf does,
-	// and act on what is left. It sits by the Scan button, where the eye
-	// starts (his request, 2026-09-17).
+	// and act on what is left.
 	p.filter = gtk.NewSearchEntry()
 	p.filter.SetPlaceholderText("filter")
 	p.filter.SetTooltipText("show only the files whose name or rule has these letters, in order; Select all then checks those")
 	p.filter.SetSizeRequest(200, -1)
-	bar.Append(p.filter)
 
 	// The order the plan is read in. It starts as the settings say and can
 	// be changed for this window alone (his request, 2026-09-17).
 	p.sort = gtk.NewDropDownFromStrings(sortItems())
 	p.sort.SetTooltipText("the order the plan is listed in; Settings has the one a new window starts with")
+
+	// The bar reads as the order of operations: which directory, how it
+	// will be listed, what of it, where it is on disk - then Scan, and only
+	// then what to do with what comes back (his request, 2026-09-17).
+	bar.Append(gtk.NewLabel("Directory"))
+	bar.Append(p.dirs)
 	bar.Append(gtk.NewLabel("sort"))
 	bar.Append(p.sort)
-
+	bar.Append(p.filter)
 	bar.Append(p.path)
+	bar.Append(p.scan)
 	bar.Append(p.selAll)
 	bar.Append(p.selNone)
 	bar.Append(p.checkedMenu())
diff --git a/gui/internal/ui/settings.go b/gui/internal/ui/settings.go
index e15f60d..73c4072 100644
--- a/gui/internal/ui/settings.go
+++ b/gui/internal/ui/settings.go
@@ -124,6 +124,19 @@ func (w *Window) showSettings() {
 	box.Append(colours)
 	box.Append(preview)
 
+	box.Append(heading("About"))
+	for i, line := range model.About(Version) {
+		l := gtk.NewLabel(line)
+		l.SetXAlign(0)
+		l.SetWrap(true)
+		// Selectable so the address can be copied out of the window.
+		l.SetSelectable(true)
+		if i > 0 {
+			l.AddCSSClass("dim-label")
+		}
+		box.Append(l)
+	}
+
 	apply := func() {
 		which := model.LayoutSide
 		if layout.Selected() == 1 {
diff --git a/gui/internal/ui/window.go b/gui/internal/ui/window.go
index ce991d8..5132c12 100644
--- a/gui/internal/ui/window.go
+++ b/gui/internal/ui/window.go
@@ -20,6 +20,10 @@ import (
 	"krino/internal/xdg"
 )
 
+// Version is what About shows. main stamps it at build time; "dev" is
+// what a plain `go build` leaves.
+var Version = "dev"
+
 // Window is krino-gui's one window: three tabs, and a status bar.
 type Window struct {
 	app *gtk.Application