fix(ui): editorial toolbar + sepia album art

Toolbar
- Strip the legacy dark capsule from .header-toolbar (background,
  border, border-radius, padding) — buttons now sit as individual
  ghost icons matching the mockup, with the per-button transparent
  border + copper hover that was already in place.

Album art
- Apply a warm sepia/saturate/contrast filter to #album-art inside
  the vinyl label so vibrant covers (e.g. Rammstein red) don't
  fight the copper palette and read consistent with the vinyl
  groove rendering. Eases back to near-natural color on .now-playing
  hover so the user can still see the real cover.
- Match the album-art-glow tint with the same hue-rotate so the
  bloom around the spinning label stays palette-aligned.

media_server/static/css/styles.css

@@ -4223,16 +4223,20 @@ header .brand-sub {
 .header-toolbar {
     grid-column: 3;
     justify-self: end;
+    /* Strip the legacy dark capsule */
+    background: transparent !important;
+    border: 0 !important;
+    border-radius: 0 !important;
+    padding: 0 !important;
+    gap: 6px;
+    display: flex;
+    align-items: center;
 }
 
 @media (max-width: 720px) {
     .header-toolbar { grid-column: 1; }
 }
 
-.header-toolbar {
-    gap: 4px;
-}
-
 .header-btn,
 .header-btn-logout,
 .header-link {
@@ -6552,6 +6556,29 @@ footer .separator { color: var(--ink-ghost); margin: 0 8px; }
     display: block;
     border-radius: 50%;
     z-index: 2;
+    /* Vinyl-consistent tint: warm sepia + slight sharpen + subtle contrast.
+       Saturate pushed down so vibrant covers don't fight the copper palette. */
+    filter:
+        sepia(0.35)
+        saturate(0.85)
+        contrast(1.08)
+        brightness(0.95)
+        hue-rotate(-6deg);
+    transition: filter 320ms var(--ease);
+}
+.now-playing:hover .vinyl-label #album-art {
+    /* On hover, ease back toward natural color so users can see the real art */
+    filter:
+        sepia(0.18)
+        saturate(0.95)
+        contrast(1.05)
+        brightness(1)
+        hue-rotate(-3deg);
+}
+
+/* Match the glow tint to the album art treatment */
+.now-playing .vinyl-label #album-art-glow {
+    filter: blur(22px) saturate(1.2) sepia(0.35) hue-rotate(-6deg);
 }
 
 /* Tonearm */