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/formatters/size_formatter.py

@@ -0,0 +1,22 @@
+class SizeFormatter:
+    """Class for formatting file sizes"""
+
+    @staticmethod
+    def format_size(bytes_size: int) -> str:
+        """Format bytes to human readable with unit"""
+        for unit in ['B', 'KB', 'MB', 'GB', 'TB']:
+            if bytes_size < 1024:
+                return f"{bytes_size:.1f} {unit}"
+            bytes_size /= 1024
+        return f"{bytes_size:.1f} TB"
+
+    @staticmethod
+    def format_size_full(bytes_size: int) -> str:
+        """Format size with both human readable and bytes"""
+        size_formatted = SizeFormatter.format_size(bytes_size)
+        return f"{size_formatted} ({bytes_size:,} bytes)"
+
+    @staticmethod
+    def format_size_short(bytes_size: int) -> str:
+        """Format size with only human readable"""
+        return SizeFormatter.format_size(bytes_size)