Add Play All, home navigation, and UI improvements

- Add Play All button with M3U playlist generation (local temp file with absolute paths)
- Replace folder combobox with root folder cards and home icon breadcrumb
- Fix compact grid card sizing (64x64 thumbnails, align-items: start)
- Add loading spinner when browsing folders
- Cache browse items to avoid re-fetching on view mode switch
- Remove unused browser-controls CSS
- Add localization keys for Play All and Home (en/ru)

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

media_server/static/css/styles.css

@@ -1130,31 +1130,6 @@
     margin: 0;
 }
 
-.browser-controls {
-    margin-bottom: 1rem;
-}
-
-.browser-controls select {
-    width: 100%;
-    padding: 0.75rem;
-    background: var(--bg-tertiary);
-    border: 1px solid var(--border);
-    border-radius: 6px;
-    color: var(--text-primary);
-    font-size: 0.875rem;
-    cursor: pointer;
-    transition: all 0.3s;
-}
-
-.browser-controls select:hover {
-    border-color: var(--accent);
-}
-
-.browser-controls select:focus {
-    outline: none;
-    border-color: var(--accent);
-}
-
 /* Breadcrumb Navigation */
 .breadcrumb {
     display: flex;
@@ -1184,6 +1159,15 @@
     text-decoration: underline;
 }
 
+.breadcrumb-home {
+    display: flex;
+    align-items: center;
+}
+
+.breadcrumb-home:hover {
+    text-decoration: none;
+}
+
 .breadcrumb-separator {
     color: var(--text-muted);
     margin: 0 0.25rem;
@@ -1243,6 +1227,29 @@
     fill: currentColor;
 }
 
+.browser-play-all-btn {
+    display: flex;
+    align-items: center;
+    gap: 0.35rem;
+    padding: 0.35rem 0.7rem;
+    background: var(--accent);
+    border: none;
+    border-radius: 6px;
+    color: #fff;
+    font-size: 0.75rem;
+    font-weight: 600;
+    cursor: pointer;
+    transition: all 0.2s;
+    width: auto;
+    height: auto;
+    margin-left: 0.5rem;
+}
+
+.browser-play-all-btn:hover {
+    background: var(--accent-hover);
+    transform: none;
+}
+
 .items-per-page-label {
     display: flex;
     align-items: center;
@@ -1272,6 +1279,7 @@
     gap: 1rem;
     margin-bottom: 1.5rem;
     min-height: 200px;
+    align-items: start;
 }
 
 /* Compact Grid */
@@ -1432,6 +1440,18 @@
     text-align: right;
 }
 
+.browser-loading {
+    grid-column: 1 / -1;
+    display: flex;
+    justify-content: center;
+    padding: 3rem;
+}
+
+.browser-loading .loading-spinner {
+    width: 28px;
+    height: 28px;
+}
+
 .browser-empty {
     grid-column: 1 / -1;
     text-align: center;
@@ -1620,9 +1640,8 @@
 
 /* Compact grid overrides */
 .browser-grid-compact .browser-thumb-wrapper {
-    width: 100%;
-    height: auto;
-    aspect-ratio: 1;
+    width: 64px;
+    height: 64px;
 }
 
 .browser-grid-compact .browser-play-overlay svg {