feat(traffic-style): smart-city icons and sprite/runtime fallback

[pjeweb]

Summary

• Add Font Awesome smart-city pictograms and default ort sprite icons (xsmall through default).
• Fix sprite padding, missing default.js in the traffic-style build output, and composable sprite/runtime icon fallback in SCSS mixins.
• Extend runtime icon styling in @mapsight/ui for the updated traffic-style pipeline.
• Document the pnpm workspace quirk when developing traffic-style in the monorepo.

Follows #56. Sass deprecation fixes for env-based icon URLs land in the next PR (#4).

Changeset

• @mapsight/traffic-style minor
• @mapsight/ui patch

Test plan

• pnpm --filter @mapsight/traffic-style build succeeds and dist/default.js is present
• Smart-city icons appear in generated sprite/meta output
• Showcase icon catalog renders sprite and runtime icons with sensible fallbacks
• CI passes

[changeset-bot]

🦋 Changeset detected

Latest commit: cbc910c

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 2 packages

Name	Type
@mapsight/traffic-style	Minor
@mapsight/ui	Patch

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