feat(servers): add jellyfin UI mods

devices/nos/modules/jellyfin/default.nix

@@ -1,7 +1,9 @@
 {
   config,
   jellyfin-flake,
+  jellyfin-ultrachromic-src,
   lib,
+  pkgs,
   ...
 }: let
   inherit (lib) hasAttr fileContents optionals;
@@ -35,9 +37,51 @@ in {
           quickConnectAvailable = false;
           isStartupWizardCompleted = true;
 
-          branding.customCss = ''
+          branding = let
+            jellyTheme = pkgs.stdenv.mkDerivation {
+              name = "Ultrachromic";
+              src = jellyfin-ultrachromic-src;
+              postInstall = "cp -ar $src $out";
+            };
+
+            importFile = file: fileContents "${jellyTheme}/${file}";
+          in {
+            customCss = ''
+              /* Base theme */
+              ${importFile "base.css"}
+              ${importFile "accentlist.css"}
+              ${importFile "fixes.css"}
+
+              ${importFile "type/dark_withaccent.css"}
+
+              ${importFile "rounding.css"}
+              ${importFile "progress/floating.css"}
+              ${importFile "titlepage/title_banner-logo.css"}
+              ${importFile "header/header_transparent.css"}
+              ${importFile "login/login_frame.css"}
+              ${importFile "fields/fields_border.css"}
+              ${importFile "cornerindicator/indicator_floating.css"}
+
+              /* Style backdrop */
+              .backdropImage {filter: blur(18px) saturate(120%) contrast(120%) brightness(40%);}
+
+              /* Custom Settings */
+              :root {--accent: 145,75,245;}
+              :root {--rounding: 12px;}
+
+              /* https://github.com/CTalvio/Ultrachromic/issues/79 */
+              .skinHeader {
+                color: rgba(var(--accent), 0.8);;
+              }
+              .countIndicator,
+              .fullSyncIndicator,
+              .mediaSourceIndicator,
+              .playedIndicator {
+                background-color: rgba(var(--accent), 0.8);
+              }
             '';
           };
+        };
 
         libraries.display = {
           enableGroupingIntoCollections = true;
@@ -46,7 +90,16 @@ in {
 
         playback.transcoding = {
           hardwareAccelerationType = "nvenc";
-          hardwareDecodingCodecs = ["h264" "hevc" "mpeg2video" "mpeg4" "vc1" "vp8" "vp9" "av1"];
+          hardwareDecodingCodecs = [
+            "h264"
+            "hevc"
+            "mpeg2video"
+            "mpeg4"
+            "vc1"
+            "vp8"
+            "vp9"
+            "av1"
+          ];
           enableThrottling = true;
           enableTonemapping = true;
           downMixAudioBoost = 1;