Upgrade Bulma to 1.0.4 and modernize Sass dependencies

[Copilot]

This PR upgrades the project from Bulma 0.9.4 to the latest stable version 1.0.4, bringing the CSS framework up to date with modern features and improvements.

Changes Made

Package Updates:

• Upgraded Bulma from 0.9.4 to 1.0.4
• Upgraded Sass from 1.69.7 to 1.92.1 (required for Bulma 1.0's modern color functions)

Import Path Fixes:
Bulma 1.0 migrated from .sass to .scss files, requiring updates to import paths:

• bulma.sass → bulma.scss in main.scss
• utilities/mixins.sass → utilities/mixins.scss in nuxt.config.ts
• Added initial-variables.scss import to provide breakpoint variables like $desktop

Bug Fixes:

• Fixed variable name typo in PlacesAndPolygons.vue: $grey-lighter → $gray-lighter

Testing

The upgrade maintains full backward compatibility:

• ✅ Build passes successfully
• ✅ Development server runs without errors
• ✅ UI renders correctly with no visual regressions
• ✅ All Bulma classes and components work as expected

Notes

• Deprecation warnings about @import vs @use are shown but non-breaking
• All existing Bulma functionality is preserved
• The project now supports modern Sass features introduced in Bulma 1.0

Fixes #13.

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