FE-1662: add filter to supply chain

[alex-e-leon]

🌟 What is the purpose of this PR?

Updates the supply chain pages in hash-frontend with the new filter bars, and updates the filter bar + sort menu with various QOL improvements to work better.

Pre-Merge Checklist 🚀

🚢 Has this modified a publishable library?

This PR:

• does not modify any publishable blocks or libraries, or modifications do not need publishing

📜 Does this require a change to the docs?

The changes in this PR:

• are internal and do not require a docs change

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Project	Deployment	Actions	Updated
hash	Ready	Preview	Sep 15, 2026 8:58am UTC
hashdotdesign-tokens	Ready	Preview	Sep 15, 2026 8:58am UTC
petrinaut	Ready	Preview	Sep 15, 2026 8:58am UTC
petrinaut-docs	Ready	Preview	Sep 15, 2026 8:58am UTC

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PR Summary

Medium Risk
Large client-side filtering and table-header UX refactor across multiple site overview views; behavior changes how filters compose with search and tab switching, though logic is covered by new unit tests.

Overview
Replaces per-column filter popovers on the site supply-chain overview with a shared chip-based filter bar (StepFilterBar + step-filters.ts) wired through design-system Filter / FilterGroup. Dwell, planning, trend, and supplier tabs now share one stepFilters state so filters survive tab switches; the opportunities table keeps a separate opportunityFilters set but uses the same filter vocabulary and option building.

Filtering runs upstream in site.tsx (with search applied after), including vendor-specific application and chips disabled or tooltipped when a filter does not apply to the active view. Column-header FilterMenu plumbing is removed (filter-menu.tsx, column-filter.ts); tables use a card layout with a pinned header band that hosts tabs inline with filter + SortMenu, and chip row expansion when filters are active. Sort menus gain additional menu-only metrics; empty states distinguish no data vs no matches via totalCount / generatedCount.

Vitest coverage is added for filter application, applicability, and option building.

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