feat: Add OpenScreen for directory input and validation

feat: Introduce poster rendering views with multiple engines

feat: Implement ASCII art poster renderer using PIL

feat: Create base class for poster renderers

feat: Add RichPixels renderer for high-quality terminal image display

feat: Implement Viu terminal image viewer renderer

feat: Add ProposedFilenameView for generating standardized filenames

feat: Create RenameConfirmScreen for renaming files with confirmation

feat: Implement SettingsScreen for configuring application settings

feat: Add custom PosterWidget for rendering poster images

src/settings.py

@@ -0,0 +1,94 @@
+import json
+import os
+import threading
+from pathlib import Path
+from typing import Dict, Any, Optional
+
+
+class Settings:
+    """Manages application settings stored in a JSON file (Singleton)."""
+
+    DEFAULTS = {
+        "mode": "technical",  # "technical" or "catalog"
+        "poster": "no",  # "no", "pseudo" (ASCII art), "viu", "richpixels"
+        "hevc_crf": 23,  # HEVC quality: 18=visually lossless, 23=high quality, 28=balanced
+        "hevc_preset": "fast",  # HEVC speed: ultrafast, veryfast, faster, fast, medium, slow
+        "cache_ttl_extractors": 21600,  # 6 hours in seconds
+        "cache_ttl_tmdb": 21600,  # 6 hours in seconds
+        "cache_ttl_posters": 2592000,  # 30 days in seconds
+    }
+
+    _instance: Optional['Settings'] = None
+    _lock = threading.Lock()
+
+    def __new__(cls, config_dir: Path | None = None):
+        """Create or return singleton instance."""
+        if cls._instance is None:
+            with cls._lock:
+                if cls._instance is None:
+                    cls._instance = super().__new__(cls)
+                    cls._instance._initialized = False
+        return cls._instance
+
+    def __init__(self, config_dir: Path | None = None):
+        """Initialize settings (only once)."""
+        # Only initialize once
+        if self._initialized:
+            return
+
+        if config_dir is None:
+            config_dir = Path.home() / ".config" / "moma"
+        self.config_dir = config_dir
+        self.config_file = self.config_dir / "config.json"
+        self._settings = self.DEFAULTS.copy()
+        self._initialized = True
+        self.load()
+
+    def load(self) -> None:
+        """Load settings from file, using defaults if file doesn't exist."""
+        if self.config_file.exists():
+            try:
+                with open(self.config_file, "r") as f:
+                    data = json.load(f)
+                    # Validate and merge with defaults
+                    for key, default_value in self.DEFAULTS.items():
+                        if key in data:
+                            # Basic type checking
+                            if isinstance(data[key], type(default_value)):
+                                self._settings[key] = data[key]
+                            else:
+                                print(f"Warning: Invalid type for {key}, using default")
+            except (json.JSONDecodeError, IOError) as e:
+                print(f"Warning: Could not load settings: {e}, using defaults")
+        else:
+            # Create config directory and file with defaults
+            self.save()
+
+    def save(self) -> None:
+        """Save current settings to file."""
+        try:
+            self.config_dir.mkdir(parents=True, exist_ok=True)
+            with open(self.config_file, "w") as f:
+                json.dump(self._settings, f, indent=2)
+        except IOError as e:
+            print(f"Error: Could not save settings: {e}")
+
+    def get(self, key: str, default: Any = None) -> Any:
+        """Get a setting value."""
+        return self._settings.get(key, self.DEFAULTS.get(key, default))
+
+    def set(self, key: str, value: Any) -> None:
+        """Set a setting value and save."""
+        if key in self.DEFAULTS:
+            # Basic type checking
+            if isinstance(value, type(self.DEFAULTS[key])):
+                self._settings[key] = value
+                self.save()
+            else:
+                raise ValueError(f"Invalid type for setting {key}")
+        else:
+            raise KeyError(f"Unknown setting: {key}")
+
+    def get_all(self) -> Dict[str, Any]:
+        """Get all current settings."""
+        return self._settings.copy()