Add data components 151-175; clear MyGo row highlights

Lists, tables, trees, grids, inventories and records in data/.
Outline and GridView build on ui.List: ui.Outline strokes its arrows
and ui.GridView spaces and tints items. The pixel theme keeps MyGo's
row highlights clear so scrolled rows stay on whole dots; off lists
take a veil against the wheel. Adds Canvas.Silhouette, SwitchOptions
Label and exports Rarity.Slot.

data/accordion.go

@@ -0,0 +1,48 @@
+package data
+
+import (
+	"fmt"
+	"log/slog"
+
+	"github.com/egoist/mygo/ui"
+
+	"git.zacharyzhang.com/ZacharyZhang-NY/8bitMyGoUI/pixel"
+)
+
+type AccordionOptions struct {
+	// Many lets several sections stay open at once.
+	Many     bool
+	Disabled bool
+}
+
+type AccordionResult struct {
+	Element *ui.Element
+	Changed bool
+}
+
+// Accordion stacks collapsible sections; one stays open unless Many.
+func Accordion(c *ui.Context, text string, titles []string, open []bool, o AccordionOptions, panel func(i int)) AccordionResult {
+	k := pixel.K(c)
+	if len(open) != len(titles) {
+		panic(fmt.Sprintf("data: Accordion has %d titles, %d open flags", len(titles), len(open)))
+	}
+	col := ui.Column(c).AlignItems(ui.Stretch).Gap(k.D(1)).Role(ui.RoleGroup).Label(text)
+	res := AccordionResult{Element: col}
+	col.Children(func() {
+		for i, t := range titles {
+			if !Collapsible(c, t, &open[i], CollapsibleOptions{Disabled: o.Disabled}, func() { panel(i) }).Changed {
+				continue
+			}
+			res.Changed = true
+			for j := range open {
+				if j != i && open[i] && !o.Many {
+					open[j] = false
+				}
+			}
+		}
+	})
+	if res.Changed {
+		slog.Debug("8bit: accordion", "label", text, "open", open)
+	}
+	return res
+}