Add ProposedFilenameView and MediaPanelView with comprehensive tests

- Implemented ProposedFilenameView to generate standardized filenames using a decorator pattern.
- Created MediaPanelView to assemble media data panels for display, aggregating multiple formatters.
- Added tests for ProposedFilenameView covering various formatting scenarios, including basic, minimal, and special cases.
- Introduced a views package to organize and expose the new views.
- Ensured proper formatting and display of media information, including file info, TMDB data, and track information.

renamer/views/__init__.py

@@ -0,0 +1,14 @@
+"""Views package - assembles formatted data for display.
+
+Views compose multiple formatters to create complex display outputs.
+Unlike formatters which transform single values, views aggregate and
+orchestrate multiple formatters to build complete UI panels.
+"""
+
+from .proposed_filename import ProposedFilenameView
+from .media_panel import MediaPanelView
+
+__all__ = [
+    'ProposedFilenameView',
+    'MediaPanelView',
+]