fix(web-player): follow the API types where they are nullable

The checked-in schema was stale and typed artist, description and externalId
as always present, so the code trusted values the API returns as null. The
regenerated schema tells the truth; the API-shaped types now admit null and it
is normalised on the way into the player, where the state stays non-null.

web-player/src/lib/components/TrackTile.svelte

@@ -7,8 +7,8 @@
 	interface Props {
 		id: string | number;
 		title: string;
-		artist?: string;
-		coverSrc?: string;
+		artist?: string | null;
+		coverSrc?: string | null;
 		coverSize?: 'small' | 'medium' | 'large';
 		hue: number;
 		explicit?: boolean;

web-player/src/lib/components/ui/Cover.svelte

@@ -7,7 +7,7 @@
 		trackId: string | number;
 		hue: number;
 		size?: 'small' | 'medium' | 'large';
-		src?: string;
+		src?: string | null;
 		alt?: string;
 		class?: string;
 		children?: Snippet;

web-player/src/lib/components/ui/Input.svelte

@@ -5,7 +5,9 @@
 		value?: string;
 		id?: string;
 		name?: string;
-		type?: 'text' | 'search';
+		type?: 'text' | 'search' | 'number';
+		min?: number;
+		max?: number;
 		placeholder?: string;
 		maxlength?: number;
 		required?: boolean;
@@ -20,6 +22,8 @@
 		id,
 		name,
 		type = 'text',
+		min,
+		max,
 		placeholder,
 		maxlength,
 		required = false,
@@ -40,6 +44,8 @@
 		{id}
 		{name}
 		{type}
+		{min}
+		{max}
 		{placeholder}
 		{maxlength}
 		{required}

web-player/src/lib/components/ui/PlaylistCard.svelte

@@ -5,7 +5,7 @@
 	interface Props {
 		id: string;
 		name: string;
-		description?: string;
+		description?: string | null;
 		trackIds: (string | number)[];
 		updatedAt: string;
 		index?: number;

web-player/src/lib/components/ui/TrackTitleCell.svelte

@@ -6,8 +6,8 @@
 	interface Props {
 		trackId: string | number;
 		title: string;
-		artist?: string;
-		coverSrc?: string;
+		artist?: string | null;
+		coverSrc?: string | null;
 		coverSize?: string;
 		hue: number;
 		explicit?: boolean;