fix: use untrack() in float clamp effect to prevent reactive loop that locked up the page

ui/src/lib/components/AudioPlayer.svelte

@@ -50,6 +50,7 @@
 
 	import { audioStore } from '$lib/audio.svelte';
 	import { goto } from '$app/navigation';
+	import { untrack } from 'svelte';
 	import { Button } from '$lib/components/ui/button';
 	import { cn } from '$lib/utils';
 	import type { Voice } from '$lib/types';
@@ -981,7 +982,7 @@
 	let floatMoved = $state(false);
 
 	function onFloatPointerDown(e: PointerEvent) {
-		e.preventDefault();
+		e.stopPropagation();
 		floatDragging = true;
 		floatMoved = false;
 		floatDragStart = { mx: e.clientX, my: e.clientY, ox: audioStore.floatPos.x, oy: audioStore.floatPos.y };
@@ -1000,19 +1001,24 @@
 		};
 		audioStore.floatPos = clampFloatPos(raw.x, raw.y);
 	}
-	function onFloatPointerUp() {
+	function onFloatPointerUp(e: PointerEvent) {
+		if (!floatDragging) return;
 		if (floatDragging && !floatMoved) {
 			// Tap: toggle play/pause
 			audioStore.toggleRequest++;
 		}
 		floatDragging = false;
+		try { (e.currentTarget as HTMLElement).releasePointerCapture(e.pointerId); } catch { /* ignore */ }
 	}
 
-	// Clamp saved position to viewport on mount and on resize
+	// Clamp saved position to viewport on mount and on resize.
+	// Use untrack() when reading floatPos to avoid a reactive loop
+	// (reading + writing the same state inside $effect would re-trigger forever).
 	$effect(() => {
 		if (typeof window === 'undefined') return;
 		const clamp = () => {
-			audioStore.floatPos = clampFloatPos(audioStore.floatPos.x, audioStore.floatPos.y);
+			const { x, y } = untrack(() => audioStore.floatPos);
+			audioStore.floatPos = clampFloatPos(x, y);
 		};
 		clamp();
 		window.addEventListener('resize', clamp);
@@ -1525,7 +1531,7 @@
 		onpointerdown={onFloatPointerDown}
 		onpointermove={onFloatPointerMove}
 		onpointerup={onFloatPointerUp}
-		onpointercancel={onFloatPointerUp}
+		onpointercancel={(e) => { floatDragging = false; try { (e.currentTarget as HTMLElement).releasePointerCapture(e.pointerId); } catch { /* ignore */ } }}
 	>
 		<!-- Pulsing ring when playing -->
 		{#if audioStore.isPlaying}