A proper layout system for the widgets

[esimkowitz]

Summary

• Introduces a unified widget layout system with reusable CSS classes (.widget, .widget-grid, .widget-params)
• Refactors all existing widgets to use the new layout patterns, reducing CSS duplication
• Updates password generator to use the layout system and adds CLAUDE.md documentation for the patterns
• Also switches to use Dioxus CLI for Rust formatting

Test plan

• Run npm run serve:web and verify all widgets render correctly
• Test the password generator with different options
• Verify textarea elements properly expand to fill available space
• Check responsive behavior at various viewport sizes

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