Redesign header as pill-shaped toolbar group

- Unified header-toolbar container with border and rounded corners
- Consistent header-btn styling for all action buttons
- Compact locale select, separator before logout icon
- Header links integrate as part of the toolbar with divider

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

media_server/static/css/styles.css

@@ -182,51 +182,105 @@ h1 {
     background: var(--accent);
 }
 
-.theme-toggle {
-    background: transparent;
-    border: none;
-    padding: 0.3rem;
-    cursor: pointer;
+.header-toolbar {
     display: flex;
     align-items: center;
-    justify-content: center;
-    transition: opacity 0.3s;
-    width: 32px;
-    height: 32px;
-    opacity: 0.7;
+    gap: 2px;
+    background: var(--bg-secondary);
+    border: 1px solid var(--border);
+    border-radius: 8px;
+    padding: 3px 4px;
 }
 
-.theme-toggle:hover {
-    opacity: 1;
+.header-toolbar-sep {
+    width: 1px;
+    height: 18px;
+    background: var(--border);
+    margin: 0 3px;
+    flex-shrink: 0;
 }
 
-.theme-toggle svg {
+.header-btn {
+    background: transparent;
+    border: none;
+    padding: 4px 6px;
+    border-radius: 5px;
+    cursor: pointer;
+    color: var(--text-secondary);
+    transition: color 0.2s, background 0.2s;
+    display: inline-flex;
+    align-items: center;
+    line-height: 1;
+}
+
+.header-btn:hover {
+    color: var(--text-primary);
+    background: var(--bg-tertiary);
+}
+
+.header-btn svg {
     width: 16px;
     height: 16px;
     fill: currentColor;
 }
 
+.header-btn-logout:hover {
+    color: var(--error);
+}
+
+.header-locale {
+    background: transparent;
+    border: none;
+    color: var(--text-secondary);
+    font-size: 0.75rem;
+    font-weight: 600;
+    padding: 4px 4px 4px 8px;
+    border-radius: 5px;
+    cursor: pointer;
+    transition: color 0.2s, background 0.2s;
+}
+
+.header-locale:hover {
+    color: var(--text-primary);
+    background: var(--bg-tertiary);
+}
+
+.header-locale:focus {
+    outline: none;
+}
+
+.header-locale option {
+    background: var(--bg-secondary);
+    color: var(--text-primary);
+}
+
 /* Header Quick Links */
 .header-links {
     display: flex;
     align-items: center;
-    gap: 0.125rem;
+    gap: 2px;
+}
+
+.header-links:not(:empty) {
+    padding-right: 3px;
+    margin-right: 3px;
+    border-right: 1px solid var(--border);
 }
 
 .header-link {
     display: flex;
     align-items: center;
     justify-content: center;
-    width: 32px;
-    height: 32px;
-    color: var(--text-primary);
-    opacity: 0.7;
-    transition: opacity 0.2s;
+    padding: 4px 6px;
+    border-radius: 5px;
+    color: var(--text-secondary);
+    transition: color 0.2s, background 0.2s;
     text-decoration: none;
 }
 
 .header-link:hover {
-    opacity: 1;
+    color: var(--text-primary);
+    background: var(--bg-tertiary);
 }
 
 .header-link svg {
@@ -271,25 +325,9 @@ h1 {
     position: relative;
 }
 
-.accent-picker-btn {
-    background: transparent;
-    border: none;
-    cursor: pointer;
-    padding: 4px;
-    display: flex;
-    align-items: center;
-    opacity: 0.8;
-    transition: opacity 0.2s;
-}
-
-.accent-picker-btn:hover {
-    opacity: 1;
-    transform: none;
-}
-
 .accent-dot {
-    width: 16px;
-    height: 16px;
+    width: 14px;
+    height: 14px;
     border-radius: 50%;
     background: var(--accent);
     border: 2px solid var(--border);
@@ -376,31 +414,6 @@ h1 {
     pointer-events: none;
 }
 
-#locale-select {
-    background: var(--bg-tertiary);
-    border: 1px solid var(--border);
-    color: var(--text-primary);
-    border-radius: 6px;
-    padding: 4px 8px;
-    cursor: pointer;
-    font-size: 12px;
-    font-weight: 500;
-    transition: all 0.3s ease;
-}
-
-#locale-select:hover {
-    border-color: var(--accent);
-}
-
-#locale-select:focus {
-    outline: none;
-    border-color: var(--accent);
-}
-
-#locale-select option {
-    background: var(--bg-secondary);
-    color: var(--text-primary);
-}
 
 /* Tab Bar */
 .tab-bar {
@@ -1922,26 +1935,6 @@ dialog::backdrop {
     display: block;
 }
 
-.clear-token-btn {
-    width: auto;
-    height: auto;
-    padding: 4px 10px;
-    border-radius: 6px;
-    font-size: 12px;
-    font-weight: 500;
-    background: var(--bg-tertiary);
-    color: var(--text-secondary);
-    border: 1px solid var(--border);
-    cursor: pointer;
-    opacity: 0.7;
-}
-
-.clear-token-btn:hover {
-    opacity: 1;
-    background: var(--error);
-    color: var(--text-primary);
-    border-color: var(--error);
-}
 
 /* Mini Player (Sticky) */
 .mini-player {