add varying intensity to stream tags

plus improving the tag select dropdown in general

src/lib/database.ts

@@ -18,7 +18,7 @@ export function getStreams(): StreamSummary[] {
         stream_date: Date.parse(stream.stream_date as string),
         filename: stream.filename as string,
         title: stream.title as string | null,
-        tags: (JSON.parse(stream.tags as string) as string[]) ?? [],
+        tags: stream.tags ? JSON.parse(stream.tags as string) : {},
         length_seconds: stream.length_seconds as number
     }));
 }
@@ -40,7 +40,7 @@ export function getStreamInfo(streamId: string): Stream | null {
         format: streamData.format as string,
         title: streamData.title as string | null,
         description: streamData.description as string | null,
-        tags: (JSON.parse(streamData.tags as string) as string[]) ?? [],
+        tags: streamData.tags ? JSON.parse(streamData.tags as string) : {},
         length_seconds: streamData.length_seconds as number,
         tracks: JSON.parse(streamData.tracks as string)
     };