Version 0.13.0

Panel Material UI 0.13.0 introduces the AppBar and MenuBar components, adds error_state and helper_text support across all input widgets, and brings several Page layout improvements including configurable main_width and app_bar_width. The release also includes fixes for contextbar variants, skeleton sizing, and various UI polish.

Many thanks to @ahuang11, @ghostiee-11, and @philippjfr for their contributions to this release.

🆕 New Components

• Add AppBar component (#680)
• Add MenuBar component (#671)

🔧 Enhancements

• Add error_state and helper_text for all input widgets (#670)
• Add main_width and app_bar_width to Page (#684)
• Disable +/- buttons when FloatInput/IntInput are disabled (#691)

🐛 Bug Fixes

• Fix Chip rendering bug (#693)
• Fix NestedSelect stretch_width (#681)
• Fix Skeleton stretch sizing (#668)
• Various fixes for persistent contextbar variants (#676)
• Only show the slider label colon when the value is shown (#690)

🎨 UI Improvements

• Do not use outlined ToggleIcon variant when active_icon is provided (#682)
• Add row_spacing to Grid documentation example (#683)

📚 Documentation

• Add missing section to documentation (#667)