UI: tema brand LazyRun, layout kartu, dan dialog yang lebih rapi

- Tema custom (indigo/cyan dari ikon, sudut membulat) mengikuti varian sistem
- Header compact: logo + wordmark, tombol aksi di kanan
- Kartu per shortcut: ikon, nama, meta singkat, chip lokasi, tombol ikon
- Teks satu baris pakai canvas.Text (widget.Label Fyne 2.8 memesan tinggi ~2x)
- Dialog: judul bagian, ikon folder pada Browse, tombol Install primary

internal/ui/theme.go

@@ -0,0 +1,80 @@
+package ui
+
+import (
+	"image/color"
+
+	"fyne.io/fyne/v2"
+	"fyne.io/fyne/v2/theme"
+)
+
+// Palet brand LazyRun, diambil dari ikon aplikasi.
+var (
+	brandIndigo = color.NRGBA{R: 0x4F, G: 0x46, B: 0xE5, A: 0xFF}
+	brandCyan   = color.NRGBA{R: 0x06, G: 0xB6, B: 0xD4, A: 0xFF}
+)
+
+// Nama warna tambahan di luar tema standar Fyne.
+const (
+	colorNameCard       fyne.ThemeColorName = "lazyrunCard"
+	colorNameMuted      fyne.ThemeColorName = "lazyrunMuted"
+	colorNameChipMenu   fyne.ThemeColorName = "lazyrunChipMenu"
+	colorNameChipDesk   fyne.ThemeColorName = "lazyrunChipDesktop"
+	colorNameChipBroken fyne.ThemeColorName = "lazyrunChipBroken"
+)
+
+// brand menimpa sebagian warna/ukuran tema bawaan; terang/gelap tetap ikut sistem.
+type brand struct{ fyne.Theme }
+
+func (b brand) Color(name fyne.ThemeColorName, variant fyne.ThemeVariant) color.Color {
+	dark := variant == theme.VariantDark
+	switch name {
+	case theme.ColorNamePrimary:
+		return pick(dark, color.NRGBA{R: 0x7C, G: 0x7A, B: 0xFF, A: 0xFF}, brandIndigo)
+	case theme.ColorNameBackground:
+		return pick(dark, color.NRGBA{R: 0x13, G: 0x13, B: 0x1B, A: 0xFF}, color.NRGBA{R: 0xF5, G: 0xF5, B: 0xFA, A: 0xFF})
+	case colorNameCard:
+		return pick(dark, color.NRGBA{R: 0x1D, G: 0x1D, B: 0x28, A: 0xFF}, color.NRGBA{R: 0xFF, G: 0xFF, B: 0xFF, A: 0xFF})
+	case theme.ColorNameInputBackground:
+		return pick(dark, color.NRGBA{R: 0x1A, G: 0x1A, B: 0x24, A: 0xFF}, color.NRGBA{R: 0xFF, G: 0xFF, B: 0xFF, A: 0xFF})
+	case theme.ColorNameButton, theme.ColorNameMenuBackground:
+		return pick(dark, color.NRGBA{R: 0x22, G: 0x22, B: 0x2E, A: 0xFF}, color.NRGBA{R: 0xEC, G: 0xEC, B: 0xF4, A: 0xFF})
+	case theme.ColorNameOverlayBackground:
+		return pick(dark, color.NRGBA{R: 0x1B, G: 0x1B, B: 0x25, A: 0xFF}, color.NRGBA{R: 0xFF, G: 0xFF, B: 0xFF, A: 0xFF})
+	case theme.ColorNameInputBorder, theme.ColorNameSeparator:
+		return pick(dark, color.NRGBA{R: 0x32, G: 0x32, B: 0x44, A: 0xFF}, color.NRGBA{R: 0xDC, G: 0xDC, B: 0xE8, A: 0xFF})
+	case colorNameMuted:
+		return pick(dark, color.NRGBA{R: 0x9C, G: 0x9C, B: 0xB4, A: 0xFF}, color.NRGBA{R: 0x6B, G: 0x6B, B: 0x80, A: 0xFF})
+	case colorNameChipMenu:
+		return withAlpha(brandIndigo, pick[uint8](dark, 0x44, 0x26))
+	case colorNameChipDesk:
+		return withAlpha(brandCyan, pick[uint8](dark, 0x3D, 0x2C))
+	case colorNameChipBroken:
+		return withAlpha(color.NRGBA{R: 0xE0, G: 0x4F, B: 0x4F, A: 0xFF}, pick[uint8](dark, 0x4A, 0x2E))
+	}
+	return b.Theme.Color(name, variant)
+}
+
+// Size membuat sudut tombol/kartu lebih membulat dari tema bawaan.
+func (b brand) Size(name fyne.ThemeSizeName) float32 {
+	switch name {
+	case theme.SizeNameButtonRadius, theme.SizeNameInputRadius:
+		return 8
+	case theme.SizeNameCardRadius, theme.SizeNamePopupRadius:
+		return 14
+	case theme.SizeNamePadding:
+		return 5
+	}
+	return b.Theme.Size(name)
+}
+
+func pick[T any](cond bool, yes, no T) T {
+	if cond {
+		return yes
+	}
+	return no
+}
+
+func withAlpha(c color.NRGBA, a uint8) color.Color {
+	c.A = a
+	return c
+}