Add media components 346-365; input.SlideBase, guarded Pad

An audio player with transport, scrubber and volume; an equalizer and
a visualizer; a playlist; a cassette, cartridge and record that turn
while they play and hold where they stop; piano keys, a step sequencer
and a tracker you can type into; a waveform, a 16:9 video frame, an
image compare, a gallery, a filmstrip, a record button and an FM tuner.

input exports SlideBase, the undrawn rail its sliders share; the
gallery treats exported Bases as building blocks, not components.
pixel's micro font gains '#' for notes like C#4. pixel.Pad and the
slide rail read input only while their base is enabled, so Inert or a
fresh Disabled stops a drag or a key already sent. AGENTS records why
a drawn container keeps the DISABLED description: MyGo paints a
disabled subtree at half opacity.

pixel/font_test.go

@@ -193,7 +193,7 @@ func hanging(punct func(rune) bool) func(rune) bool {
 }
 
 func TestMicroFont(t *testing.T) {
-	set := "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ+-.:/%! "
+	set := "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ+-#.:/%! "
 	seen := map[[MicroHeight]uint8]rune{}
 	for _, r := range set {
 		g := microGlyph(r)
@@ -213,8 +213,8 @@ func TestMicroFont(t *testing.T) {
 	}
 	defer func() {
 		if recover() == nil {
-			t.Fatal("micro '#' did not panic")
+			t.Fatal("micro '@' did not panic")
 		}
 	}()
-	MicroWidth("#")
+	MicroWidth("@")
 }

pixel/messages.go

@@ -34,6 +34,7 @@ var messages = map[Locale]map[string]string{
 		"from": "FROM", "subject": "SUBJECT", "date": "DATE", "faces": "FACES", "nature": "NATURE", "items": "ITEMS",
 		"mute": "MUTE", "camera": "CAMERA", "hang_up": "HANG UP", "new_count": "%d NEW", "votes": "%d VOTES", "unread": "%d UNREAD",
 		"day_date": "%[1]s %[2]d %[3]s", "category": "CATEGORY", "days": "SUN MON TUE WED THU FRI SAT",
+		"prev_track": "PREVIOUS", "next_track": "NEXT", "play": "PLAY", "volume": "VOLUME", "rec": "REC", "playing": "PLAYING", "seek": "SEEK",
 	},
 	Zh: {
 		"ok": "确定", "cancel": "取消", "yes": "是", "no": "否", "close": "关闭",
@@ -66,6 +67,7 @@ var messages = map[Locale]map[string]string{
 		"from": "发件人", "subject": "主题", "date": "日期", "faces": "表情", "nature": "万物", "items": "道具",
 		"mute": "静音", "camera": "摄像头", "hang_up": "挂断", "new_count": "%d 条新", "votes": "%d 票", "unread": "%d 未读",
 		"day_date": "%[4]d月%[2]d日 周%[1]s", "category": "类别", "days": "日 一 二 三 四 五 六",
+		"prev_track": "上一首", "next_track": "下一首", "play": "播放", "volume": "音量", "rec": "录制", "playing": "正在播放", "seek": "进度",
 	},
 }
 

pixel/micro.go

@@ -52,6 +52,7 @@ var micro = microFont(map[rune]string{
 	'Z': "###|..#|.#.|#..|###",
 	'+': "...|.#.|###|.#.|...",
 	'-': "...|...|###|...|...",
+	'#': "#.#|###|#.#|###|#.#",
 	'.': "...|...|...|...|.#.",
 	':': "...|.#.|...|.#.|...",
 	'/': "..#|..#|.#.|#..|#..",

pixel/pad.go

@@ -9,6 +9,11 @@ func Pad(c *ui.Context, text string, cols, n, cw, ch int, cur *int, disabled boo
 		return ui.Box(c).Focusable().Role(ui.RoleGroup).Label(text).Disabled(disabled)
 	})
 	shell.Size(k.D(cols*cw), k.D((n+cols-1)/cols*ch))
+	picked = -1
+	// Disabled or inert, even a key already sent waits.
+	if base.IsDisabled() {
+		return shell, base, st, picked
+	}
 	for _, m := range []struct {
 		key ui.Key
 		to  func() int
@@ -21,7 +26,6 @@ func Pad(c *ui.Context, text string, cols, n, cw, ch int, cur *int, disabled boo
 			*cur = to
 		}
 	}
-	picked = -1
 	enter, space := base.Shortcut(0, ui.KeyEnter), base.Shortcut(0, ui.KeySpace)
 	if enter || space {
 		picked = *cur