Add media browser with grid/compact/list views and single-click playback

- Add browser UI with three view modes (grid, compact, list) and pagination
- Add file browsing, thumbnail loading, download, and play endpoints
- Add duration extraction via mutagen for media files
- Single-click plays media or navigates folders, with play overlay on hover
- Add type badges, file size display, and duration metadata
- Add localization keys for browser UI (en/ru)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

media_server/services/browser_service.py

@@ -8,6 +8,12 @@ from typing import Optional
 
 from ..config import settings
 
+try:
+    from mutagen import File as MutagenFile
+    HAS_MUTAGEN = True
+except ImportError:
+    HAS_MUTAGEN = False
+
 logger = logging.getLogger(__name__)
 
 # Media file extensions
@@ -109,6 +115,26 @@ class BrowserService:
         else:
             return "other"
 
+    @staticmethod
+    def get_duration(file_path: Path) -> Optional[float]:
+        """Get duration of a media file in seconds (header-only read).
+
+        Args:
+            file_path: Path to the media file.
+
+        Returns:
+            Duration in seconds, or None if unavailable.
+        """
+        if not HAS_MUTAGEN:
+            return None
+        try:
+            audio = MutagenFile(str(file_path))
+            if audio is not None and hasattr(audio, "info") and hasattr(audio.info, "length"):
+                return round(audio.info.length, 2)
+        except Exception:
+            pass
+        return None
+
     @staticmethod
     def browse_directory(
         folder_id: str,
@@ -202,6 +228,14 @@ class BrowserService:
             total = len(all_items)
             items = all_items[offset:offset + limit]
 
+            # Extract duration for media files in the current page
+            for item in items:
+                if item["is_media"]:
+                    item_path = full_path / item["name"]
+                    item["duration"] = BrowserService.get_duration(item_path)
+                else:
+                    item["duration"] = None
+
             return {
                 "folder_id": folder_id,
                 "current_path": current_path,