Main Header global filter not propagated to Inventory & Coverage subpages (QA 2.7+2.14, 2.8+2.15)

[cristim]

Symptom (QA Main Header 2.7+2.14 and 2.8+2.15)

The Main Header global Provider/Account chips do not propagate into the Inventory & Coverage subpages:

• Active Commitments: list keeps showing all providers/accounts regardless of chip selection.
• Coverage (PR feat(coverage): per-provider coverage breakdowns (V1) replace placeholder stub #760 V1): per-provider sections don't filter to the chip selection.

Acceptance

• Selecting Provider in the topbar narrows BOTH subpages to that provider only.
• Selecting Account narrows both subpages to that account only.
• Provider + Account combined narrows to the intersection.
• Empty states are filter-aware ("No active commitments for /") mirroring PR fix(purchases): wire topbar filter chips to all three Purchases consumers (refs #701) #741's Purchases pattern.
• Frontend tests cover Active Commitments + Coverage subpages reacting to chip changes.

Files likely involved

• frontend/src/inventory.ts (sub-tabs Active Commitments + Coverage)
• The chip subscription pattern already exists in frontend/src/modules/savings-history.ts (PR fix(purchases): wire topbar filter chips to all three Purchases consumers (refs #701) #741) and frontend/src/dashboard.ts (PR fix(home/filter): wire Account chip to dashboard chart (QA 2.3) #747); mirror the same isInventoryTabActive + queueMicrotask coalescing pattern.

Source

QA Main Header 2.7+2.14, 2.8+2.15 (exploratory testing 2026-05-27).