Align library styles with the design system

Use type recipes and Button danger variant, add danger tint, dropzone and cover-fill tokens, give SearchInput a size prop so the top bar keeps its larger search, show queue details inline on mobile, derive upload limits from constants and document the card hover style.

web-player/src/lib/data/uploadQueue.test.ts

@@ -4,6 +4,7 @@ import {
 	titleFromFileName,
 	toQueuedUpload,
 	uploadError,
+	uploadLimitsLabel,
 	UPLOAD_MAX_BYTES
 } from '$lib/data/uploadQueue';
 
@@ -43,3 +44,11 @@ describe('summarizeQueue', () => {
 		expect(summarizeQueue(items)).toEqual({ ready: 2, failed: 1 });
 	});
 });
+
+describe('uploadLimitsLabel', () => {
+	it('lists the formats and the size limit', () => {
+		expect(uploadLimitsLabel()).toBe(
+			'WAV, FLAC, AIFF o MP3 · hasta 500 MB por archivo · puedes soltar carpetas enteras'
+		);
+	});
+});