feat(inventory/ri-exchange): honor Main Header global filter (closes #871)

[cristim]

Summary

Makes the Inventory & Coverage > RI Exchange sub-tab honor the Main Header global Provider/Account filter, resolving QA Main Header 2.9 (#871). RI Exchange was the last Inventory sub-tab that ignored the global chips; Active Commitments and Coverage already honor them via the wireChipSubscriptions / isInventoryTabActive / queueMicrotask-coalescing + subscribeProvider/subscribeAccount pattern landed in #866 / #881. This PR mirrors that pattern for RI Exchange.

Behavior

• Provider = AWS -> AWS exchangeable convertible RIs only (existing flow), scoped to the selected account.
• Provider = Azure -> Azure exchangeable VM reservations only; reshape recommendations show a provider-aware "not available for Azure" note (reshape is an AWS Cost Explorer concept).
• Provider = GCP -> "RI Exchange isn't available for GCP" empty state across all sections; no list endpoint is called, no stale rows remain.
• Account/subscription chip -> narrows the list; empty states name the scope ("No exchangeable reservations for /").
• Filter change clears the in-progress exchange selection -> the quote/execute modal closes synchronously on any chip change so the user can't act on a now-hidden RI (mutating workflow).

Backend

• GET /api/ri-exchange/instances now accepts ?account_id=. Convertible RIs come from the deployment's ambient AWS credentials (one account); when the chip selects a different account, the handler returns an empty list (not an error). A real STS resolution failure fails closed (propagates the error) rather than leaking the ambient account's RIs.
• Azure already scopes by subscription_id. GCP has no endpoint; the frontend short-circuits to the empty state.

Tests

• Frontend: chip change reloads the scoped list; GCP not-available state; Azure path renders reservations; selection cleared on filter change; scoped empty-state copy.
• Backend: account-scope mismatch returns an empty list; resolve-error fails closed.

tsc, full jest (2172 pass), and go test ./internal/api/... (1359 pass) all green.

Closes #871.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: e1c0d7a9-dbc7-4bde-b6b2-f24d90519747

📥 Commits

Reviewing files that changed from the base of the PR and between 9476456 and afa3691.

📒 Files selected for processing (9)

• frontend/src/__tests__/riexchange-permissions.test.ts
• frontend/src/__tests__/riexchange.test.ts
• frontend/src/api/index.ts
• frontend/src/api/riexchange.ts
• frontend/src/api/types.ts
• frontend/src/riexchange.ts
• internal/api/handler.go
• internal/api/handler_ri_exchange.go
• internal/api/handler_ri_exchange_test.go

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/871-riexchange-global-filter

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