feat(player): click-to-seek progress bar; 2-row waveform bars with peak normalization

- ProgressBar: full-width played/remaining bar in the player pane, click-to-seek;
  waveform no longer handles seeking or the played/future color split (pure visual)
- bars: 2 terminal rows per bar (16 levels) via barChars, partial block in the
  top row so the column renders continuously
- fix bars maxing at audio start: disable cava autosens (silence gain-ramp),
  pre-warm the malloc'd FFT window with zeros, skip partial FFT windows
- createBarScaler peak follower + power curve replaces cava autosens for
  level-to-height mapping (src/utils/bar-mapping.ts, unit-tested)

src/pages/Player/ProgressBar.tsx

@@ -0,0 +1,56 @@
+/**
+ * ProgressBar — one-row, click-to-seek playback progress bar for the
+ * player pane. Played portion renders as full blocks (█) in the theme's
+ * primary color, the remainder as light shade blocks (░) in the muted
+ * color. The header time/percent text lives in PlayerPage — this is only
+ * the bar itself.
+ */
+
+import { useTerminalDimensions } from "@opentui/solid";
+import { useAudio } from "@/hooks/useAudio";
+import { useTheme } from "@/context/ThemeContext";
+
+// ── Component ────────────────────────────────────────────────────────
+
+export function ProgressBar() {
+	const audio = useAudio();
+	const { theme } = useTheme();
+	const dimensions = useTerminalDimensions();
+
+	// Full content width of the player pane: the player is a 2-pane row
+	// (parent 1/5 + current 4/5 of the terminal width). Subtract ~8 chars
+	// of border/padding chrome (same math as RealtimeWaveform's numBars).
+	const width = () => Math.max(8, Math.floor((dimensions().width * 4) / 5) - 8);
+
+	const clamp01 = (value: number) => Math.max(0, Math.min(1, value));
+
+	const playedChars = () => {
+		const duration = audio.duration();
+		if (duration <= 0) return 0;
+		return Math.round(clamp01(audio.position() / duration) * width());
+	};
+
+	const remainingColor = theme.muted || theme.text;
+
+	return (
+		<box
+			border
+			borderColor={theme.border}
+			padding={0}
+			flexDirection="row"
+			gap={0}
+			onMouseDown={(e: { x: number }) => {
+				const duration = audio.duration();
+				if (duration <= 0) return;
+				// e.x = 0 is the box border; content starts at x = 1.
+				const ratio = Math.max(0, Math.min(1, (e.x - 1) / width()));
+				void audio.seek(ratio * duration);
+			}}
+		>
+			<text fg={theme.primary}>{"\u2588".repeat(playedChars())}</text>
+			<text fg={remainingColor}>
+				{"\u2591".repeat(width() - playedChars())}
+			</text>
+		</box>
+	);
+}