Ikon otomatis dari internet + cursor mengikuti tema host

- Cari ikon online (Iconify) dari dialog install, plus tombol sync ikon per shortcut
- Auto ikon: file terdekat -> favicon situs (termasuk ikon manifest PWA) -> ikon brand
  yang namanya cocok -> ikon default; sumber ikon disimpan di metadata
- Query dibersihkan (web.whatsapp.com -> whatsapp) dan kata <4 huruf tidak dipakai
  supaya aplikasi tanpa ikon resmi tidak dapat ikon acak
- Unduhan thumbnail dibatasi 4 bersamaan + retry sekali (rate limit Iconify)
- Cursor: XCURSOR_THEME/XCURSOR_SIZE diambil dari config KDE/GTK/~/.icons default,
  dan AppImage tidak lagi membundel libX*/libwayland*/libxkbcommon (dipakai dari host)
- README: bagian ikon + integrasi desktop

internal/ui/dialog_icon.go

@@ -0,0 +1,96 @@
+package ui
+
+import (
+	"fmt"
+	"strings"
+
+	"fyne.io/fyne/v2"
+	"fyne.io/fyne/v2/container"
+	"fyne.io/fyne/v2/dialog"
+	"fyne.io/fyne/v2/theme"
+	"fyne.io/fyne/v2/widget"
+
+	"lazyrun/internal/icon"
+)
+
+// showIconSearch menampilkan pencarian ikon online (Iconify) dan mengirim hasil pilihan.
+func (ui *app) showIconSearch(query string, onPick func(icon.Result, []byte)) {
+	entry := widget.NewEntry()
+	entry.SetText(icon.QueryHint(query))
+	entry.SetPlaceHolder("whatsapp")
+
+	status := muted(T("search_hint"))
+	slots := make(chan struct{}, 4)
+	grid := container.NewGridWithColumns(6)
+	results := container.NewVScroll(container.NewPadded(grid))
+
+	var d *dialog.CustomDialog
+	search := func() {
+		if strings.TrimSpace(entry.Text) == "" {
+			status.SetText(T("search_hint"))
+			return
+		}
+		status.SetText(T("searching"))
+		grid.RemoveAll()
+		go func() {
+			list, err := icon.SearchBest(entry.Text, 24)
+			fyne.Do(func() {
+				if err != nil {
+					status.SetText(T("search_failed"))
+					return
+				}
+				status.SetText(fmt.Sprintf(T("search_found"), len(list)))
+				for _, result := range list {
+					grid.Add(ui.iconChoice(result, onPick, d, slots))
+				}
+			})
+		}()
+	}
+
+	entry.OnSubmitted = func(string) { search() }
+	content := container.NewBorder(
+		entry,
+		container.NewBorder(nil, nil, status,
+			container.NewHBox(
+				widget.NewButton(T("cancel"), func() { d.Hide() }),
+				widget.NewButtonWithIcon(T("search"), theme.SearchIcon(), search),
+			)),
+		nil, nil,
+		results,
+	)
+
+	d = dialog.NewCustom(T("icon_search_title"), "", content, ui.win)
+	d.Resize(fyne.NewSize(560, 460))
+	d.Show()
+	search()
+}
+
+// iconChoice adalah satu ikon hasil pencarian; gambarnya diunduh di latar belakang.
+func (ui *app) iconChoice(result icon.Result, onPick func(icon.Result, []byte), d *dialog.CustomDialog, slot chan struct{}) fyne.CanvasObject {
+	var data []byte
+
+	button := widget.NewButton("", func() {
+		onPick(result, data)
+		if d != nil {
+			d.Hide()
+		}
+	})
+	button.Importance = widget.LowImportance
+
+	go func() {
+		slot <- struct{}{} // batasi unduhan bersamaan supaya tidak kena rate limit
+		defer func() { <-slot }()
+
+		downloaded, _, err := icon.FromURL(result.URL)
+		if err != nil {
+			return
+		}
+		data = downloaded
+		fyne.Do(func() {
+			button.Icon = fyne.NewStaticResource(result.Name, downloaded)
+			button.Refresh()
+		})
+	}()
+
+	return container.NewGridWrap(fyne.NewSize(52, 52), button)
+}