Describe your changes

Modernizes st.area_chart and st.bar_chart to use the new Height and Width type systems ("stretch", "content", or pixel values) for consistency with other chart elements.

Also begins deprecation of use_container_width, which will be removed after 12-31-2025. When explicitly set, use_container_width=True maps to width="stretch" and use_container_width=False maps to width="content".

Changes Made:

• Updated parameter signatures:
  • width: int | None = None → Width = "stretch"
  • height: int | None = None → Height = "content"
  • use_container_width: bool = True → bool | None = None (deprecated)
• Preserved backward compatibility: Existing integer values and use_container_width behavior still work with deprecation warnings
• Updated layout system: Uses LayoutConfig(width=width, height=height) for consistent layout handling
• Enhanced validation: Added proper parameter validation with clear error messages

GitHub Issue Link (if applicable)

N/A

Testing Plan

• Unit Tests (Python) - Width/height parameter functionality and backward compatibility
• Unit Tests (Python) - use_container_width deprecation warnings
• E2E Tests - Visual behavior across width/height values ("content", "stretch", pixel values)
• Manual testing completed

Additional Notes:

Part of the broader AdvancedLayouts initiative to provide consistent width and height APIs across all chart elements.

Contribution License Agreement

By submitting this pull request you agree that all contributions to this project are made under the Apache 2.0 license.