add colors to album page header

- add colors attribute to the album class
- render color gradient in the album page

server/app/models.py

@@ -82,6 +82,7 @@ class Album:
     Creates an album object
     """
 
+    albumid: str
     title: str
     artist: str
     hash: str
@@ -92,14 +93,21 @@ class Album:
     is_soundtrack: bool = False
     is_compilation: bool = False
     is_single: bool = False
+    colors: List[str] = field(default_factory=list)
 
     def __init__(self, tags):
+        self.albumid = tags["_id"]["$oid"]
         self.title = tags["title"]
         self.artist = tags["artist"]
         self.date = tags["date"]
         self.image = tags["image"]
         self.hash = tags["hash"]
 
+        try:
+            self.colors = tags["colors"]
+        except KeyError:
+            self.colors = []
+
     @property
     def is_soundtrack(self) -> bool:
         keywords = ["motion picture", "soundtrack"]