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/PlayerPage.tsx

@@ -12,6 +12,7 @@
 
 import { Show } from "solid-js";
 import { PlaybackControls } from "./PlaybackControls";
+import { ProgressBar } from "./ProgressBar";
 import { RealtimeWaveform } from "./RealtimeWaveform";
 import { useAudio } from "@/hooks/useAudio";
 import { useAppStore } from "@/stores/app";
@@ -79,6 +80,8 @@ export function PlayerPage() {
 							{ep().description?.slice(0, 500) ?? "No description available."}
 						</text>
 
+						<ProgressBar />
+
 						<RealtimeWaveform
 							visualizerConfig={(() => {
 								const viz = useAppStore().state().settings.visualizer;